2026-09-13T06:05:18Z https://publicacoes.softaliza.com.br/cilamce2022/oai

oai:publicacoes.softaliza.com.br:article/5179 2024-05-29T12:47:39Z cilamce2022:ART

Investigating Satellite Attitude and Orbit Control System Performance of the SDRE Technique regarding Parametric Uncertainty Alessandro Gerlinger Romero Luiz Carlos Gadelha de Souza SDRE Nonlinear Parametric Structured Uncertainty The satellite attitude and orbit control subsystem (AOCS) can be designed with success by linear con-trol theory if the satellite has slow angular motions. However, for fast maneuvers, the linearized models are not able to represent all the perturbations due to the effects of the nonlinear terms present in the dynamics whichcompromises the system’s performance. Therefore, in such cases, it is expected that nonlinear control techniques yield better performance than the linear control techniques, improving the AOCS pointing accuracy without re-quiring a new set of sensors and actuators. Nonetheless, these nonlinear control techniques can be more sensitive to parametric uncertainties. One candidate technique for the design of AOCS control law under a fast maneuver is the State-Dependent Riccati Equation (SDRE). SDRE provides an effective algorithm for synthesizing nonlin-ear feedback control by allowing nonlinearities in the system states while offering great design flexibility through state-dependent weighting matrices. The Brazilian National Institute for Space Research (INPE, in Portuguese)was demanded by the Brazilian government to build remote-sensing satellites, such as the Amazonia-1 mission.In such missions, the AOCS must stabilize the satellite in three-axes so that the optical payload can point to thedesired target. Currently, the control laws of AOCS are designed and analyzed using linear control techniquesin commercial software. Although elsewhere the application of the SDRE technique with opensource softwarehas shown to yield better performance for the missions developed by INPE, a subsequent important question iswhether such better performance is robust to parametric uncertainties. In this paper, we investigate whether theapplication of the SDRE technique in the AOCS is robust to parametric uncertainties in the missions developed byINPE. The initial results showed that SDRE controller is robust to ±20%, at least, variations in the inertia tensorof the satellite. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5179 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5179/4252

oai:publicacoes.softaliza.com.br:article/5180 2024-05-29T12:47:38Z cilamce2022:ART

On the implementation of SGFEM simulation of cohesive crack propagation problems Thaianne S. de Oliveira Felício B. Barros Samuel S. Penna Stable Generalized Finite Element Method Generalized Finite Element Method Computational Mechanics Fracture Mechanics Object Oriented Programming Non-linear analysis The present work aims to discuss some details regarding the implementation of a cohesive crack prop-agation system using the Stable Generalized Finite Element Method (SGFEM), a relatively new approach that derives from a simple modification of enrichment functions used in Generalized/eXtended Finite Element Method(G/XFEM). For this, a combination between Heaviside functions that employ a stabilization parameter, presentedin Wu and Li [1], and a trigonometric function [2] is used as enrichment. A cohesive crack model is considered.Though nonlinear material models, e. g., damage or plasticity, could be used, the bulk is considered as a linearelastic material for the discussions carried out in this work. Results involving crack direction criteria, as proposedby Wells and Sluys [3] and Moes and Belytschko [2], are also compared. To the best of the authors knowledge, ̈ SGFEM has never been applied to simulate cohesive crack propagation problems with the presence of trigonomet-ric enrichment functions. This work is related to a proposal of expansion of the INSANE (INteractive Structural ANalysis Environment) system, an open-source project developed at the Structural Engineering Department ofthe Federal University of Minas Gerais. This platform has enabled the resources that allowed the implementationdiscussed in this work. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5180 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5180/4253

oai:publicacoes.softaliza.com.br:article/5181 2024-05-29T12:47:38Z cilamce2022:ART

Human comfort assessment of floors subjected to dynamic loading induced by people groups Elisângela A. R. dos Santos José Guilherme S. da Silva steel-concrete composite floors dynamic structural analysis human comfort assessment This research work aims to investigate the dynamic structural behaviour and evaluate the human comfortof steel-concrete composite floors when subjected to loads induced by rhythmic human activities in places such asfitness centres, event halls and offices. The investigated structural model is characterised by a steel-concretecomposite floor of a commercial building used for aerobics, which presents dimensions of 40m x 40m and a totalarea of 1,600m2. The dynamic loads were obtained through the use of traditional mathematical models associatedto “only force” and also based on the use of biodynamic systems, aiming to incorporate the human-structureinteraction dynamic effect to assess the human comfort. The floor numerical model was developed based on usualmodelling techniques, adopting the mesh refinement present in the Finite Element Method (FEM), andimplemented in the computer program ANSYS. The dynamic structural response (displacements andaccelerations) was determined through the investigation of several dynamic loading models related to peoplegroups practising rhythmic activities on the floor concrete slab. Finally, based on the dynamic structural response(peak acceleration), the results were compared with the floor project serviceability limits, indicating that themaximum peak acceleration values surpass the design criteria, causing excessive vibration and human discomfort. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5181 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5181/4254

oai:publicacoes.softaliza.com.br:article/5183 2024-05-29T12:47:37Z cilamce2022:ART

Methodology based on Genetic Algorithms and Finite Elements to obtain the 3D Surgical Planning for the Periacetabular Osteotomy procedure in treatment of hip dysplasia Marcus V. S. Ferraz Daniel S. Ferreira Flavia S. Bastos Bruno G. S. Souza Sara D. Vecchio Developmental dysplasia of the hip Periacetabular Osteotomy Abaqus® Optimization Genetic Algorithm Developmental dysplasia of the hip is characterized by a condition of joint instability in which thehead femoral artery presents an abnormal relationship with the acetabulum, which may be accompanied or not apartial (subluxation) or complete dislocation (dislocation) of the femoral head. The treatment of hip dysplasia inadults aims to prolong the longevity of the joint by performing the periacetabular osteotomy. In patients withoutearly diagnosis and treatment and in treated young adults inappropriately or incorrectly, surgical interventionssuch as osteotomies are performed to prevent coxarthrosis and other pathologies that can develop secondary todysplasia. Periacetabular osteotomy aims to change the biomechanics pathological condition of the hip, causing areorientation of the acetabulum and consequent improvement of joint stability. In view of the complexity presented,both by the curve of learning and the performance of the surgical procedure, it is interesting to use of tools andcomputational models in order to assist the surgeon in his achievement and, consequently, in the improvement ofresults. The present work seeks study the application of a genetic algorithm in conjunction with simulations via themethod of finite elements using the ABAQUS®software, in a geometric model obtained through of a computedtomography in a real patient, aiming to optimize the surgical planning based on maximizing the resulting forceobtained as a function of contact pressures and contact area in the acetabular cartilage. A comparison is made withthe results obtained from the surgical planning developed according to radiographic parameters, from which it isverified that the proposed methodology results in an optimal configuration for the fragment, which translates intoimproved joint stability. The values of rotation angles in the x, y and z directions are shown. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5183 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5183/4255

oai:publicacoes.softaliza.com.br:article/5184 2024-05-29T12:47:37Z cilamce2022:ART

Nondeterministic dynamic analysis and structural optimization of the steel towers design for wind turbines support André Victor da S. Castilho Francisco José da C. P. Soeiro José Guilherme S. da Silva wind towers dynamic structural analysis structural optimization Considering the growing demand for electricity and the need to reduce the greenhouse gases emission,the adoption of renewable energy has presented considerable growth in recent years. Having in mind itstechnological development and competitive prices, the use of wind energy has shown an increasing growth on itsinstalled capacity around the world. In Brazil, a wind potential of 1.78 TW is estimated. This way, this researchwork aims to perform a dynamic structural analysis of a steel tower used to support a Repower model MM92 windturbine, with a production capacity of 2 MW. The dynamic analysis is performed based on a three-dimensionalfinite element model through the utilization of the ANSYS software, considering the soil-structure interactioneffect, the wind loadings on the rotor and non-deterministic wind loadings applied on the steel tower. To do this,a wind velocity in the range of survival mode of the turbine is considered, aiming to investigate the tower structuralbehavior under this condition. After the steel tower nondeterministic dynamic structural assessment, thedisplacements and stresses values calculated in the steady-state response will be considered for the systemoptimization, based on the Genetic Algorithms, and using the MATLAB software. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5184 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5184/4256

oai:publicacoes.softaliza.com.br:article/5185 2024-05-29T12:47:36Z cilamce2022:ART

Investigation on the nondeterministic dynamic structural response of tall buildings Leonardo F. de Miranda José Guilherme S. da Silva high-rise buildings dynamic structural analysis human comfort assessment Based on the last few decades, the Brazilian cities have presented a relevant increasing when the designand construction of tall and slender buildings is considered. It must be emphasized that this architectural trendproduced very flexible structures, with low natural frequency values and more susceptible to excessive vibrationsproblems, especially when subjected to wind dynamic loads. Having these ideas in mind, this investigation aimsthe study of tall buildings non deterministic dynamic structural response, considering the soil-structure interactioneffect. This way, the developed analysis methodology considers the wind pressure coefficients on the building’sfacade determined based on the use of CFD (Computational Fluid Dynamics) techniques that nowadays representsan increasingly important role in high-rise buildings projects, utilised as a sophisticated analysis method to predictthe airflow on the building’s structural system. This way, the nondeterministic dynamic structural behaviour of a40-storey reinforced concrete building, 140 m high and floor dimensions of 9 m by 29.05 m was investigated. Thebuilding numerical model was developed to obtain a realistic representation of the structure, based on the FiniteElement Method (MEF), using the ANSYS program. It must be emphasized that the results obtained throughoutthis research work, considering the wind pressure coefficients calculated based on CFD techniques and thosedetermined by the Brazilian design standard NBR 6123 have indicated important quantitative differences, whenthe dynamic structural response (displacements and peak accelerations) and the building human comfort wereinvestigated. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5185 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5185/4257

oai:publicacoes.softaliza.com.br:article/5186 2024-05-29T12:47:36Z cilamce2022:ART

Effect of the cable system on the static and dynamic stability of Guyed Towers Ícaro R. Marques Paulo B. Gonçalves Deane M. Roehl Guyed Tower Natural Frequencies Non-linear Vibrations Post-critical Behavior This paper aims at understanding the influence of the cable setup on the static and dynamic stability ofthe guyed towers. For such, simplified models consisting of mast and cables at different inclinations and guys levelare studied. The effect of these structural characteristics is studied through a nonlinear finite element model. First,the influence of the configuration of the guys on the linear vibration frequencies and buckling load of the mast isinvestigated considering the initial deformations and internal forces due to self-weight and cable pretension.Coincident buckling loads and vibration frequencies happen for an even cable distribution around the tower. Thissymmetry condition may lead to interactive buckling and internal resonance, increasing the effect of the geometricnonlinearities on the response of the structure. Second, the nonlinear static and dynamic frequencies and bucklingloads are determined for the different guys configurations. The results show that the towers exhibit highly nonlinearresponses, even at low load levels. Thus, the geometric non-linear behavior must be considered in the design stage.In addition, the results indicate the necessity of further investigation of the nonlinear dynamic response of thesestructures for guys setup and mast dimensions used in actual towers. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5186 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5186/4258

oai:publicacoes.softaliza.com.br:article/5187 2024-05-29T12:47:35Z cilamce2022:ART

Verification of the order of accuracy of the discretization error in the simulation of tumor growth Jesika Maganin Marcio Augusto Villela Pinto Neyva Maria Lopes Romeiro Error analysis Mathematical model Numerical simulations In Engineering there are several problems to be studied, such as applications in biomedicine, whichare typical problems in Computational Fluid Dynamics (CFD). To solve these problems, numerical methods areused regardless of complexity, geometry, physical parameters, boundary and initial conditions. Linear or nonlinearmodels can be considered to assess both temporal and spatial evolution. However, one of the main disadvantagesof numerical methods is the determination of computational errors associated with their use, in which numericalsolutions can be affected by truncation, iteration, rounding, and programming errors. Although numerical errors cannot be eliminated, they must be controlled or minimized. The discretization error is considered the most signif-icant among the sources of numerical error, requiring its analysis. Therefore, this work aims to verify the accuracy of the discretization error of a one-dimensional model of tumour growth, using a priori and a posteriori estimatesof numerical solutions. We predict the asymptotic behaviour of the discretization error in the a priori estimation.We estimate the magnitude of the error based on multiple meshes using the Richardson estimator in the a posterioriestimation. The model used in this work is described by a system of partial differential equations in a transient regime, with four variables involved in the process of tumour cell invasion, resulting in the description and evolu-tion of cancer cell density, extracellular matrix (ECM) density, the concentration of matrix degradative enzymes (MDE) and tissue inhibitors of metalloproteinases (TIMP). To discretize the mathematical model, we used thefinite difference method with Central Difference Scheme (CDS) for spatial discretization and the Crank-Nicolsonmethod for temporal discretization. The nonlinear terms involved in the model were linearized by applying the Taylor series expansion. To advance in time, this discretization procedure results in the resolution of a set of alge-braic equations to be solved with the aid of the iterative Gauss-Seidel method. The simulations are performed with Dirichlet boundary conditions. We use the manufactured solutions method for code verification and error analysis. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5187 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5187/4259

oai:publicacoes.softaliza.com.br:article/5188 2024-05-29T12:47:34Z cilamce2022:ART

Experimental and numerical dynamic analysis of buildings floors when subjected to human-induced loads Felipe A. de Sousa Gilvan L. Debona José Guilherme S. da Silva reinforced concrete floor dynamic structural analysis experimental test human comfort Numerous cases involving excessive vibrations on buildings floors due to human dynamic actions havebeen reported over the years. However, it is worth to mention that the human rhythmic activities, especially whenperformed by people groups tend to increase the degree of synchronization that may result in discomfort for thebuilding users. Therefore, this research work aims to investigate the dynamic structural behaviour of a reinforcedconcrete floor when subjected to rhythmic human activities. The investigated floor corresponds to a gym withdimensions of 16 m x 35 m, and total area of 560 m2. Initially, the floor dynamic properties (natural frequenciesand structural damping) were determined based on the structure experimental monitoring. Afterwards, a floornumeric model was developed, based on the use of usual mesh refinement techniques present in Finite ElementMethod (FEM) simulations and implemented in software ANSYS. This way, several dynamic loadingsmathematical formulations (only-force models and biodynamic systems) were implemented in order to assess thefloor dynamic structural response. The obtained results (displacements and accelerations) and the human comfortassessment presented in this study indicate the relevance of the dynamic analysis to investigate the structuralbehaviour of the reinforced concrete floor and also the influence of the people-structure dynamic interaction. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5188 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5188/4260

oai:publicacoes.softaliza.com.br:article/5189 2024-05-29T12:47:34Z cilamce2022:ART

Influence of the progressive pavement deterioration on the steel- concrete composite highway bridges service life Ana Célia S. da Silva Guilherme S. Alencar José Guilherme S. da Silva dynamic analysis progressive degradation fatigue assessment Nowadays, the significant increase associated to the vehicle’s weight and traffic volume on the highwaybridge decks has made these structures subjected to several degradation phenomena. In this context, structuralfatigue is one of these progressive degradation events induced by vehicles dynamic impacts that can producesignificant increasing of the stress values. Having these ideas in mind, this research work aims is to develop ananalysis methodology to assess the fatigue performance of steel-concrete composite highway bridges, includingthe dynamic actions due to vehicles convoys and the pavement progressive deterioration effect. The developedanalysis methodology is based on the use of Miner-Palmgren linear cumulative damage rule, Rainflow algorithmand S-N curves associated to the traditional design codes. This way, the investigated structural model correspondsto a steel-concrete composite highway bridge spanning 40 m subjected to vehicles traffic. The developed numericalmodel adopted the usual mesh refinement techniques present in Finite Element Method (FEM) simulationsimplemented in the ANSYS program. The main conclusions of this investigation focused on verify the extensionof the dynamical effects on the service life of steel-concrete composite highway bridges due to vehicles crossingon the deteriorated pavement surface. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5189 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5189/4261

oai:publicacoes.softaliza.com.br:article/5190 2024-05-29T12:47:33Z cilamce2022:ART

Nonlinear analysis and parametric study on steel beams with circular web openings T. M. Borghi L. H. C. El Debs S. De Nardin Steel beam with circular web openings nonlinear analysis parametric study finite element method Steel beam with circular web opening have been gaining more space in the Brazilian industry. Theybring countless benefits to the construction, in addition to reducing the cost, there is also a reduction in weight,allowing the passage of service ducts, which integrate the installations with the floor system. The variability ofthis system can make it difficult to carry out experimental tests that evaluate all possibilities, as they demand morefinancial, human, and time resources. Thus, numerical analysis presents as an alternative for this evaluation,seeking the best option for applying this system. Therefore, this paper aims to simulate numerically steel beamswith circular web opening, using the finite element method. The analysis includes material and geometricnonlinearities, as well as the study of instability. Through experimental results performed by Morkhade and Gupta(2015), the numerical model was calibrated to carry out a parametric study that evaluates the spacing of openings(s), diameter of openings (d), height of beam web (h) and beam thickness (t). Calibration was performed bycomparing the load x mid-span deflection experimental curve with the numerical one, obtaining satisfactoryresults. The parametric study concluded that, in general, the parameters significantly influenced in the structuralbehavior of the beam, except the spacing of openings. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5190 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5190/4262

oai:publicacoes.softaliza.com.br:article/5191 2024-05-29T12:47:33Z cilamce2022:ART

Fluid-Structure Interaction between Broad Crested and Hydrodynamics Effects under Sand bed sediments Albernaz, V. R Elias, R. N Sediment Transport Computational Fluid Dynamics (CFD) Fluid-Structure Interaction The present study intends to report the initial findings results in the hydrodynamic and sedimenttransport modeling with a study case of a broad crested weir considering a sediment bed made of sands. Theadopted numerical model is the REEF3D, a Computational Fluid Dynamics tool, which is able to do sedimenttransport simulations, according to Bihs and Olsen [1]. The main objective is to examine the hydrodynamics effectsof the flow around the structure in a movable sediment bed. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5191 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5191/4263

oai:publicacoes.softaliza.com.br:article/5192 2024-05-29T12:47:32Z cilamce2022:ART

Unsupervised feature selection-based technique for locating structural deterioration: a multi-domain approach Victor H. M. Alves Alexandre A. Cury Structural Health Monitoring Damage Localization Automated Feature Selection Multi-domain Structural monitoring methods have been extensively researched in recent years due to developments in Artificial Intelligence (AI) technology. In this regard, the purpose of this work is to offer an automated data-driven approach for deterioration localization based on the extraction of features from raw vibration data utilizing domain knowledge and a filtering procedure. To diversify information retrieval, feature extraction is conductedconcurrently in temporal, frequency, and quefrency domains. This filtering process is known as feature selection(FS) and is used to reduce redundancies and raise the relevance of the feature set by removing a subset based on apredefined criterion. The key idea is that the proposed approach may be tuned to the structure while offeringgenerality for whatever shape, material, or excitation it comes across. The deterioration index is calculated via outlier analysis referenced by the structure's healthy condition. The technique was successfully tested in a full-scale bridge, demonstrating a performance that is encouraging for real-world monitoring scenarios. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5192 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5192/4265

oai:publicacoes.softaliza.com.br:article/5193 2024-05-29T12:47:31Z cilamce2022:ART

Comparison among four techniques to predict the compressive strength of concrete: Extreme Gradient Boosting, Support Vector Regression, Artificial Neural Networks, and Gaussian Process Regression Rafael C. F. da Paixão Rúben E. Penido Vítor F. Mendes Alexandre A. Cury Júlia C. Mendes machine learning concrete mix design compressive strength The compressive strength (Rc) of concrete is an important feature that influences the safety, durability,and cost of a structure. To achieve the desired Rc, professionals generally use mix design methods based on empiricaltables. Then, the Rc must be confirmed in laboratory with tests that cost time and resources. To mitigate this issue,this study proposes and compares the use of four Machine Learning (ML) techniques to predict the Rc of concretesfrom their components. The techniques are: Extreme Gradient Boosting, Support Vector Regression, Artificial NeuralNetworks, and Gaussian Process Regression. Initially, a dataset vastly used in the literature for this purpose was usedas input. Secondly, a dataset built by the authors was used to validate the models’ generalization ability. All modelswere cross-validated (10-fold) and their accuracies were measured by R2, MAE, and RMSE. XGBoost and GPRpresented the best performance, while SVR presented the worst. Despite the positive performances measured in allmodels with the first dataset, the metrics dropped sharply in the validation step involving the second dataset. Thus,the ML techniques are promising tools for the mix design of concretes, but attention must be taken to guarantee thatmodels are not overfitted because of the homogeneity of the input data. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5193 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5193/4266

oai:publicacoes.softaliza.com.br:article/5194 2024-05-29T12:47:30Z cilamce2022:ART

A continuous-discontinuous strategy to represent the crack process in concrete structures Lívia Ramos Santos Pereira Samuel Silva Penna Continuous-discontinuous strategy Concrete crack representation Nonlocal damage models The study of fracture in quasi-brittle materials such as concrete has significant importance since it isone of the main causes of material failure. There are two numerical approaches to representing fracture: smearedand discrete models, and both techniques have pros and cons. Among the smeared approaches, damage modelsare used to reproduce the degradation of a continuum media. These models are appropriate for describing the firststages of degradation, identifying damaged regions, and replacing original mechanical properties with damaged ones. This strategy assumes that the cracks are spread over an area known as the fracture process zone. How-ever, this phenomenological approach cannot represent the crack path properly since the discontinuities are not geometrically described. In contrast, the discrete methods are the most indicated to characterize the fracture ex-plicitly. Such methods frequently deal with remeshing, an alternative that has been avoided because of the high computational cost. Although, based on the efficiency of modern computers, it is now possible to evaluate theviability of coupling continuous and discontinuous models to reproduce fracture in its entirety, from nucleation tocollapse. In this context, it is proposed a combined strategy that associates nonlocal damage models to representthe smeared aspects of crack propagation with a discrete crack description based on nodal duplication to capturethe crack discontinuity. Finally, numerical simulations were performed to analyze the efficiency of this strategy inrepresenting the degradation processes from smeared cracks to geometric discontinuities. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5194 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5194/4267

oai:publicacoes.softaliza.com.br:article/5196 2024-05-29T12:47:29Z cilamce2022:ART

Uncertainty Quantification in 1d Pore Pressure Prediction of Exploratory Wells Vinícius F. Carneiro Nelson F. F. Ebecken Pore Pressure Uncertainty Quantification Sensitivity Analysis The pore pressure model serves as a subsidy for the well project, predicting potential risk events. Eventssuch as stuck pipe and inflow of fluids into the well result in a high cost in exploratory oil projects, either due tothe time spent fighting them, or the complete loss of the well. Unfortunately, in exploratory projects we do nothave enough data, nor the indirect data have good reliability, therefore, these models have high uncertainties. Thepresent work proposes the application and evaluation of the uncertainty and sensitivity analysis methodology inthe 1D pore pressure models used in the drilling of exploratory oil wells, to quantify and measure their impact. Forthis purpose, data from wells drilled in the Santos Basin, southeastern Brazilian margin, were used. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5196 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5196/4268

oai:publicacoes.softaliza.com.br:article/5197 2024-05-29T12:47:29Z cilamce2022:ART

Neighborhood and wind direction effects on wind pressure distribution on the low-rise building roof Vitor Gabriel de Oliveira Camilo Marco D. de Campos wind action pressure coefficients Ansys low-rise buildings Low-rise buildings are the majority of the houses that are constructed all over the world. Experimentsof the wind loads acting on these buildings provide vital information to design secure structures and adverseweather conditions resistants, considering the basic parameters in the analysis of gable buildings as roof slopesand the wind direction. This study estimated the distribution of wind pressures around the contour of buildingswith gable roofs, considering diverse neighborhood conditions such as the number and geometric configuration ofbuildings on the ground, in conjunction with the different angles of wind incidence. The simulations took placewith Ansys Workbench software, and the RNG K-Epsilon turbulence model and tetrahedral mesh were employed.The application validation of the CFD technique occurred in the double sloped pitched roof structure. The resultsshowed good concordance with the literature. The pressure coefficients were analyzed, and in the flowvisualization, highlighted the attachment points and the recirculation zones. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5197 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5197/4269

oai:publicacoes.softaliza.com.br:article/5198 2024-05-29T12:47:28Z cilamce2022:ART

Effects of epistemic uncertainties on truss topology optimization considering progressive collapse Lucas A. Rodrigues da Silva André T. Beck André J. Torii structural reliability progressive collapse latent failure probability risk optimization The history of engineering contains many examples of structural failures. Despite being related todiverse causes, these collapses can be attributed to the existence of uncertainties, which are usually classified asaleatory and epistemic. In this context, optimization techniques can be employed in order to obtain optimalstructural solutions that are robust to the effects of uncertainty. Additionally, the progressive collapse phenomenonhas raised engineers' and researchers' awareness in recent years. However, there are still very few papers addressingthe optimal structural design under uncertainty considering progressive collapse. Hence, this paper aims toinvestigate the effect of aleatory and epistemic uncertainties on truss topology optimization considering progressive collapse. Uncertainties are considered in the optimization problems through the RBDO (Reliability-Based Design Optimization) and RO (Risk Optimization) formulations. Non-structural factors, which are epistemic in nature and can lead to progressive collapse, are considered using a formulation based on the latentfailure probability concept. Through a simple six-bar truss problem, the huge impact of epistemic uncertainties onoptimal topologies is shown. The variation of the latent failure probability indicates the existence of two transitionpoints in the optimal solutions, named Hyperstatic and Redundancy Thresholds. We conclude that these boundsare mainly controlled by the magnitude of epistemic uncertainties, having a strong effect on the reliability andcosts of the optimal solutions. These results reveal something that has already been recognized in practice:engineering structures need to be redundant in order to cope with the effect of epistemic uncertainties. Therefore,despite being an idealized concept, the latent failure probability proves to be a simple tool to impose minimalredundancy in optimal structural solutions. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5198 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5198/4270

oai:publicacoes.softaliza.com.br:article/5199 2024-05-29T12:47:27Z cilamce2022:ART

Assessment of the distortion-induced fatigue strength in steel-concrete composite bridges welded joints Vencislau M. Quissanga Guilherme S. Alencar José Guilherme S. da Silva steel-concrete composite bridges fatigue strength welded joints hot-spot stress Highway bridges are known as structural systems permanently affected by random loads that can causesignificant damage to the structural elements. Nowadays, a challenging problem for structural engineers isassociated to the high-stress amplitudes related to the fatigue induced by distortion on the steel elements.Therefore, in this research work, the hot-spot stress method was validated aiming to assess the distortion-inducedfatigue strength in welded joints of steel-concrete composite bridges. It is important to emphasize that for thevalidation of the hot-spot stress method, a full-scale fatigue tests database was taken into account, designedprecisely to serve as a basis for the evaluation of the fatigue resistance induced by distortion. This way, theinvestigated highway bridge finite element model, developed based on the use of the ANSYS program, was utilizedas a global model with a local sub model, aiming to perform the compatibility and interpolation of thedisplacement’s fields of both models (global and local). The numerically obtained results based on the hot-spotapproach were compared with those calculated with the conventional methods, resulting, therefore, in aconsiderable difference, showing that the hot-spot method is more realistic, in view of its effectiveness in terms ofcapture of stress concentrations due to the geometry of welded details, over for evaluation of fatigue damage. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5199 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5199/4271

oai:publicacoes.softaliza.com.br:article/5200 2024-05-29T12:47:26Z cilamce2022:ART

Plastic Stress Concentration Factor KF in Fatigue Mengen Liu Antonio Carlos de Oliveira Miranda Marco Antonio Meggiolaro Jaime Tupiassú Pinho de Castro Short cracks stress gradient factor notch-induced plasticity fatigue plastic stress concentration factor notch concentration This study uses the stress gradient factors (SGFs) ahead of notch tips to determine the notch effects in fatigue, which are generally smaller than notch stress concentration factor due to the material tolerance to non-propagating short cracks. Even under elastic nominal stress levels, the notch vicinity may accumulate plastic strains when the maximum local stress exceeds the material yield strength. Considering the significant role of localplasticity in the propagation behavior of short cracks within the notch plastic zone and therefore in the notchsensitivity, a methodology is proposed to take into account the elastic-plastic stress and strain fields modeled byNeuber’s rule and cyclic Ramberg-Osgood equation. 2D finite element analyses are conducted to compute thestress intensity factors (SIFs) of smooth and notched specimens, which in turn are used to calculate the SGFs andfinally to obtain plastic fatigue notch factor predictions. To validate the methodology, experimental S-N data ofcentre-notched, U-notched and V-notched plate specimens made of different materials and tested at uniaxial loadratio R=-1, 0 and 0.1 are collected from the literature and compared with simulation results. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5200 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5200/4272

oai:publicacoes.softaliza.com.br:article/5202 2024-05-29T12:47:25Z cilamce2022:ART

Dynamic analysis of Baja-type vehicle subjected to excitation by irregular road profile Laura D. V. Braz Gabriel R. P. Reis Guilherme Magnabosco Letícia F. F. Miguel Vehicle dynamics Newmark’s method Road roughness Automotive vehicles are complex dynamic systems that travel over uneven roads of different qualities.This interaction induces vibrations whose characteristics depend on the suspension system, speed, and pavement type, among other factors. Extended exposure to vibrations can be annoying and harmful to human health, de-pending on the acceleration levels. At Baja SAE competitions, small off-road vehicles are designed and built to withstand rough terrains. Therefore, knowing the vehicle’s response to irregularities is relevant to ensuring compli-ance with safety requirements. In this paper, a computational routine is designed to evaluate the dynamic response of a BAJA-type vehicle to excitations induced by an irregular surface. A three-dimensional full-car model witheight degrees of freedom simulates the vehicle’s vertical dynamics. The road surface roughness is modeled inthe frequency domain using Power Spectral Density functions, which are converted to time-domain signals. Thenumerical integration of the equations of motion is made through Newmark’s method. The code is validated using commercial software and data from the literature. The outputs are the displacement, velocity, and acceleration sig-nals for each vehicle’s degree of freedom. Results evidenced the suspension system’s effect on damping vibration levels experienced by the driver in relation to the base motion of the wheels. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5202 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5202/4273

oai:publicacoes.softaliza.com.br:article/5203 2024-05-29T12:47:25Z cilamce2022:ART

Experimental nonlinear dynamic analysis of a machine supporting structure Reyolando M.L.R.F. Brasil experimental dynamic analysis nonideal motors nonlinear dynamics of structures We present an experimental study of the effects of geometric nonlinearities on vibrations of rotatingmachines support structures. Dynamic characteristics of structures depend on their stiffness, damping and mass.The initial stiffness of a structure, computed in its unloaded state, is affected by the applied forces, the so-calledgeometric stiffness. Compressive forces reduce the stiffness and the frequencies and may lead to buckling, for zerofrequencies. In bases of machines excited by the supported equipment, vibrations may affect the structures but, ingeneral, they may generate damage to the suspended equipment and the quality of the production. Althoughmachine support structures are, as a rule, very bulky, little affected by geometric stiffness considerations, thetendency of modern structural engineering, especially in aerospace applications, is towards slender members, dueto more efficient materials and powerful analysis tools. Here we study these effects via experimental methodsdesigned to evaluate previous mathematical models. Our model is a metal beam under compression supporting aDC motor. We suppose the original design provided natural frequencies away from the excitation frequency.Nevertheless, the presence of large axial compressive force will reduce the beam stiffness and natural frequenciesleading to unexpected, potentially dangerous resonance states. Experimental imperfections led to observation ofinteresting phenomena not predicted in our previous theoretical and numerical studies. We also observe, asexpected, occurrence of the so called Sommerfeld Effect, when underpowered excitation sources get their rotationregime stuck at resonances. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5203 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5203/4274

oai:publicacoes.softaliza.com.br:article/5204 2024-05-29T12:47:24Z cilamce2022:ART

A three degrees of freedom model of the support structure of a non- ideal motor Reyolando M.L.R.F. Brasil Robert S. Birch nonideal systems Sommerfeld effect capture at resonance unbalanced motor foundation n rotating-unbalance-machine/structure systems, stable regime is when angular velocity is constant, allenergy supplied by the motor consumed by internal friction and energy dissipated by damping of structure. Energybeyond this accelerates the system. Each energy level provided by the motor corresponds to stable constant angularspeed. H is the torque consumed by the motor internal friction. Summed to the R torque to overcome dampingforces of the support structure gives the S torque. L is the active motor torque provided. In an ideal system, the motor provides power to go over the resonance peaks of the structure and achieve the rated motor speed. In a non-ideal system, with limited power supply, an available motor torque level L can intercept the torque curve S consumed by friction and the structure at a constant rotation point before or after the resonance peak. If before, isa stable point of capture at resonance. Angular velocity no longer increases, stagnating before the peak, notreaching higher rotation speed. Jumps happens when more energy is supplied to overcome this stagnation. Therecomes a point the torque curve goes over the peak and intercepts the consumed torque curve further ahead in steady higher angular velocity, no intermediate stable steady states. There is really no difference between ideal and non-ideal systems. Only the available power level. A model considering mutual interaction support-structure/machine, should always be used. In that sense, all systems are non-ideal. In practice, if the motor has enough power thiseffect is negligible and we only consider interaction between the motor and the structure but not the reverseinteraction, simplifying the model. Literature is available on 1-DOF support structure models, with 2 coupledautonomous equations of motion, 1 for the structure, 1 for the motor. In this paper we present a better representationof a machine foundation moving in horizontal and vertical directions, with mass, stiffness and damping for eachone. Thus, we study 2 possible occurrences of the Sommerfeld Effect in the same model XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5204 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5204/4275

oai:publicacoes.softaliza.com.br:article/5205 2024-05-29T12:47:24Z cilamce2022:ART

Numerical Modeling of Reinforced Concrete and EPS Core Sandwich Panels under Bending Geovany F. Barrozo William T.M. Silva Luciano M. Bezerra Jerfson M. Lima Sandwich Panel Numerical Modeling Finite Element Method The use of construction systems based on the use of Sandwich Panels has grown significantly in theBrazilian civil construction market in recent years, with greater application in residential buildings. However, dueto the absence of normative regulation and reliable calculation standards, this system is often used without afundamental understanding of its structural behavior. Thus, in order to evaluate the resistant capacity of thesepanels when subjected to bending forces, this work consisted of the elaboration of a three-dimensional numericalmodel of a Sandwich Panel of reinforced concrete with EPS core and metallic connectors, being used the ABAQUSfor its conception, which is a software based on the Finite Element Method (FEM). In addition, the model considersthe non-linear behavior of materials, through the use of the Concrete Damage Plasticity model (CDP) and thePlasticity model for steel, which is calibrated and validated by experimental studies present in the literature,presenting results in agreement with those obtained by the experiments. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5205 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5205/4276

oai:publicacoes.softaliza.com.br:article/5206 2024-05-29T12:47:23Z cilamce2022:ART

Evaluating Different Neural Networks Architectures for the Solution of Heat Conduction Problems in NVIDIA Modulus Felipe M. Eler Anaximandro A. P. M. de Souza Paulo Couto Alvaro L. G. A. Coutinho Physics-informed neural network (PINN) Heat conduction Machine learning The use of neural networks to address engineering problems is increasing considerably. A limitationof using neural networks is the need for large amounts of data to fit nonlinear problems with acceptable accuracy.An alternative to the purely data-driven approach is the physics-informed neural networks, which add physicalconstraints that significantly reduce the amount of data needed to achieve acceptable accuracy. In this work, wesolve two simple heat conduction problems using PINNs, evaluating the complexity of different neural networkarchitectures. A direct comparison to the analytical solution proved the PINNs to be good solvers for the evaluated partial differential equations. A fully connected neural network (FCN) handles the problem well for the steady-state case. However, a gated recursive unit (GRU) architecture is needed to solve a transient problem. For both problems, an architecture of 6 layers with 64 units each is sufficient to achieve good results. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5206 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5206/4277

oai:publicacoes.softaliza.com.br:article/5207 2024-05-29T12:47:23Z cilamce2022:ART

Numerical observation of traveling wave solution in a non-Newtonian foam model Jhuan B. Cedro Grigori Chapiro Foam flow in porous media Traveling waves Non-Newtonian fluid Foam injection is an oil recovery technique with great potential to be applied in the Brazillian Pre-saltreservoirs. It consists of injecting gas and surfactant solution into the reservoir to control the gas mobility, avoid thefingering formation, and improve sweep efficiency. Investigating the foam flow in porous media is challenging dueto foams’ non-Newtonian behavior. That is why most mathematical studies on this subject consider Newtonianmodels. In the literature, there is a non-Newtonian model describing the foam displacement validated throughlaboratory experiments. In the present work, we numerically verified that this model possesses a traveling wavesolution i.e., a stable-shape profile displacing in space with constant velocity. Such a solution is similar to onesappearing in Newtonian models. We validate our results by comparing them to the experimental data found in theliterature. The numerical method is based on a finite difference Crank-Nicolson scheme with the Newton-Raphsonmethod for time step evolution. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5207 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5207/4278

oai:publicacoes.softaliza.com.br:article/5208 2024-05-29T12:47:22Z cilamce2022:ART

Wavefront velocity for foam flow in three-layer porous media A. J. Castrillon Vasquez G. Chapiro Traveling waves Foam flow Multilayer Porous medium The foam became interesting for many applications, including the oil industry, due to its capacity tocontrol gas mobility, which is specifically relevant in fractured reservoirs. In the present work, we use a simplifiedbubble population balance model to describe foam displacement in porous media. We approach the fracturedstructure of the porous medium in a three-layer configuration, where the middle layer possesses a small width andhigh permeability. Numerical investigation using Foam Displacement Simulator (FOSSIL) points out the existenceof a stable traveling wave water saturation profile evidencing the applicability of the foam injection to control gasmobility in fractured reservoirs. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5208 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5208/4279

oai:publicacoes.softaliza.com.br:article/5209 2024-05-29T12:47:22Z cilamce2022:ART

Nonlinear resonance curves of a cylindrical panel with unilateral contact of a discontinuous elastic base Jordana L. Morais Frederico M. A. Silva cylindrical panel elastic base unilateral contact initial geometrical imperfection The aim of this work is to analyze the influence of a discontinuous unilateral elastic base and an initialgeometrical imperfection on the nonlinear vibrations of a simply supported cylindrical panel. The cylindrical panelis described by the nonlinear shallow shell theory of Donnell and discretized by the Galerkin method, using areduced order model which is obtained by a perturbation method. The discontinuous elastic base model is describedby a Heaviside function and the unilateral contact is defined by the Signum function. The results show the dynamicanalysis of the cylindrical panel through the backbone curves, bifurcation diagrams, phase portraits and resonancecurves to understanding the influence of the discontinuous unilateral elastic base and the initial geometricalimperfection of the cylindrical panel. An efficient modal solution with two degree-of-freedom is sufficient todescribe the nonlinear softening behavior of the cylindrical panel with a discontinuous unilateral elastic base. Theinfluence of the unilateral elastic base and the initial geometrical imperfection on the dynamic stability of thecylindrical panel is demonstrated in the resonance curves, phase planes, Poincaré mappings and bifurcationdiagrams, where it is possible to identify important changes in the stable and unstable regions of the resonancecurves when compared with a cylindrical panel with a discontinuous bilateral elastic base. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5209 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5209/4280

oai:publicacoes.softaliza.com.br:article/5210 2024-05-29T12:47:21Z cilamce2022:ART

Comparative analysis between different integration methods for frames subjected to earthquakes Patrick de Oliveira Batista da Costa Letícia Fleck Fadel Miguel Dynamic analysis seismic excitation and numerical integration The choice of the type of structure model, the duration time of the dynamic loading, the size of the timestep, as well as the inclusion or not of nonlinearity are factors that should be taken into consideration when decidingon different solution methods for the dynamic analysis, as they are able to influence the stability and accuracy inthe response of the structure. This paper presents a comparison of dynamic analysis results for different integrationmethods in the time domain. This comparison is evaluated using a steel plane frame subjected to a Tohokuearthquake that occurred in 2011 in Japan. The structure is modeled in two-dimensional finite elements anddiscretized into bar elements. The entire analysis is developed by implementing a numerical routine in Python 3language. It is expected to find distinct results regarding the accuracy in displacements, velocities and accelerationsdue to the spurious oscillations inserted due to the characteristic of the finite element method. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5210 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5210/4281

oai:publicacoes.softaliza.com.br:article/5211 2024-05-29T12:47:21Z cilamce2022:ART

Mode Localization in Quasi Periodic Cyclic Structures Reyolando F. Brasil Elizabete O. Silva Henrique C. Margon mode localization vibrational energy turbine blades finite element method In this work, we study the phenomenon of localization of vibration modes in quasi-periodic cyclicstructures with linear behavior. They are composed of nominally identical substructures loosely coupled together,taking into account possible small imperfections. Such linear systems in the face of the disorder caused by smallimperfections, can lead to the confinement of vibrational energy in certain regions of the structure, a phenomenonknown as Mode Localization. This phenomenon can cause catastrophic failure due to high vibration amplitude andfatigue. The identification and study of the location effect from a modal perspective, as well as the response of thestructure and its components to dynamic requests is of fundamental importance, as it is a diagnostic tool forpossible preventive mitigation actions or even use of this phenomenon in damping of the system. Through theimplementation of computer simulation via MATLAB® software, based on the Finite Element Method, thedistribution, interference and consequence of vibrational energy on the adopted model are analyzed with referenceto the periodic and ordered or aperiodic and disordered dynamic characteristics. The so-called “real case” considersthe small variations in characteristics (length, stiffness, attack angle), resulting from manufacturing tolerances orFOD (Foreign Object Debris) impact. This work presents graphically the amplitude of normalized vibrationamplitude resulting from the appearance of the phenomenon of localization of vibration modes in the substructures,which can be restricted to one or a few of them. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5211 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5211/4282

oai:publicacoes.softaliza.com.br:article/5212 2024-05-29T12:47:20Z cilamce2022:ART

A mathematical and rheological study of the pastes that make up obturator endodontic cement from MTA base Mariana E. Nunes Eliandro R. Cirilo Neyva M. L. Romeiro Paulo L. Natti Mathematical Modeling Rheology Levenberg-Marquardt Method MTA Rheological Model The MTA-Fillapex endodontic cement is constituted from base and catalyst pastes. In the presentwork we investigated, from several rheological models, the model that described the best relationship between theshear stress and shear rate for the pastes. To the investigation, five paste lots were selected, and the BrookfieldRST-CPS rheometer was used to the measurements. The rheological laws were deduced according to the models:Bingham, Ostwald-de Waele, Herschel-Bulkley, and Casson. The models parameters were calculated by means ofour code. We used the Levenberg-Marquardt Method, from the computational platform OCTAVE on the version 5.2.0. Additionally, we analyzed the parameters’ existence domain, the fitted determination coefficient, the maxi-mum deviation, and the correlation matrix. From this, the preliminary results showed that the Ostwald-de-Waele was most representative rheological model to characterize the base paste, and to the catalyst paste we had theHerschel-Bulkley model as the better representation. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5212 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5212/4283

oai:publicacoes.softaliza.com.br:article/5213 2024-05-29T12:47:19Z cilamce2022:ART

Modelo reduzido para análise estática de uma placa retangular hiperelástica Daniella M. O. Aguiar Renata M. Soares placas hiperelásticas lei constitutiva Neo-Hookeana não linearidade física não linearidade geométrica modelo reduzido Realiza-se a análise estática de uma placa fina retangular, composta de material hiperelástico sujeita acarregamento de pressão uniformemente distribuído. Ambas as não linearidades são consideradas e, para isso,aplica-se o modelo Neo-Hookeano, que descreve a não linearidade física do material, e a teoria não linear de vón Kármán, que incorpora a não linearidade geométrica. Compara-se as respostas obtidas para os diagramas pressão-deslocamento de um sistema de equações com doze graus de liberdade, obtido com aplicação das ferramentas do cálculo variacional no funcional de energia da placa, com um modelo reduzido pelo Método de Karhunen-Loève.Para a geometria analisada, o modelo reduzido, de custo computacional menor que o sistema original, representade forma satisfatória o comportamento estático da placa. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5213 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5213/4284

oai:publicacoes.softaliza.com.br:article/5214 2024-05-29T12:47:19Z cilamce2022:ART

Application of the G/XFEM, quasi-3D theory, and the nonlocal elasticity in the vibration analysis of thick functionally graded nano-plates Oscar A. G de Suarez Rodrigo Rossi G/XFEM quasi 3D nano-plates non-local elasticity In this study, the problem of free vibrations in functionally graded moderately thick nanoplates isaddressed. The numerical models are obtained employing the quasi-3D plate theory and the approximation spacesare obtained according to the G/XFEM with PU's with regularity , = 1,2. The choice to use the citedapproximation spaces is related to their regularity, which is extremely relevant in non-local dynamic elasticproblems. In this sense, the use of approximation spaces obtained with FEM-Lagrange produces significantdifferences in the nanoscale result which does not occur in classical or local elasticity. In the case studies, thefollowing effects on the first resonance frequency are analyzed: increase in the nanoplate size, distribution of thebiphasic material, and increment of the nanoscale parameter. As a complementary result, the effect of the regularityof the approximation spaces in the verification of the stiffness softening phenomenon is analyzed. The normalizedfrequencies resulting from those obtained with high order FEM-Lagrange, a semi-analytic solution, and theHermitian elements (H-FEM) , = 1,2. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5214 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5214/4285

oai:publicacoes.softaliza.com.br:article/5215 2024-05-29T12:47:18Z cilamce2022:ART

Fission and Deformations in the Colon Epithelium using Finite Element Methods G. Romanazzi G. Settanni Colorectal Cancer PDE System Finite Element Method Tissue Deformation The goal of this work is to model and simulate a crypt deformation and fission in the colon epitheliumoriginated by an abnormal cell proliferation located in the crypt walls. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5215 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5215/4286

oai:publicacoes.softaliza.com.br:article/5216 2024-05-29T12:47:18Z cilamce2022:ART

Nonlinear transient vibrations of an orthotropic silo longitudinally stiffened considering the charging/discharging of the grains Henrique de O. Pereira Frederico M. A. da Silva silos nonlinear dynamic low-dimensional model grain pressure The type of structure most used for the storage of grains are the cylindrical metallic silos, being slenderstructures in shell, which have great capacity to withstand the axial loads and the lateral pressures that aresubmitted. This paper aims to develop a low-dimensional model, with a reduced number of degrees of freedom,capable of analyzing the behavior of orthotropic and longitudinally stiffened silos subjected to static and dynamicaxisymmetric actions. The nonlinear Sanders-Koiter theory is used to model the silo and Chebyshev polynomialsare used to simulate the cantilever at the base and the free end in which these types of structures are commonlybuilt. Grain pressures are determined according to the Janssen model, including the Heaviside function to simulatecharging, and discharging inside the silo. In addition, the Heaviside function is also applied to the kinetic energyand the natural frequency of the system, to compose the variation of mass and damping generated by the grainsover time. The motion equations are obtained by applying Hamilton's Principle and the Rayleigh-Ritz method andusing the 4th order Runge-Kutta method, the maximum axial and transverse displacements during charging, anddischarging are found, noting that an increase occurs when compared to the static values of grain storage, whichgenerates greater efforts being applied to the silo structure. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5216 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5216/4287 Copyright (c) 2024 XLIII Ibero-Latin American Congress on Computational Methods in Engineering

oai:publicacoes.softaliza.com.br:article/5218 2024-05-29T12:47:17Z cilamce2022:ART

Artificial Intelligence methods applied to the damage detection in beams Fernando V. B. Medeiros Luiz C. Wrobel Artificial intelligence Damage detection Structural dynamics Structural health monitoring (SHM) has become increasingly important in the field of civil engineer-ing. The objective of this paper is on the application of Artificial Intelligence Methods in the SHM field. The formulation uses modal parameters of a structure to detect damage related to the reduction of stiffness of a section.The databases for training and validating the AI methods were generated in a structured and automatic way byan algorithm developed in Python programming language within the finite element software Abaqus. The modal parameters analyzed were the first five natural frequencies of a beam. An exploratory analysis was performed us-ing other characteristics such as: length of the beam, failure severity, material, boundary conditions, cross section and others. It was possible to evaluate the performance of the AI methods on the proposed problem. Finally, aparametric comparison was made between the different Artificial Intelligence methods. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5218 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5218/4288

oai:publicacoes.softaliza.com.br:article/5219 2024-06-11T17:16:06Z cilamce2022:ART

oai:publicacoes.softaliza.com.br:article/5220 2024-05-29T12:47:16Z cilamce2022:ART

A non-linear finite volume method coupled with a higher order MUSCL- type formulation for the numerical simulation of groundwater solute transport Fernando R. L. Contreras Jose T. G. Silva Uewerton A. O. Vaz Alessandro R. E. Antunes Paulo R. M. Lyra Darlan K. E. Carvalho Groundwater solute transport Finite volume method for groundwater simulation Nonlinear TPFA MUSCL with MLP A groundwater solute transport model that predicts the process of contaminant migration plays an impor-tant role in the control and remediation of groundwater contamination. For example, in simulating solute transport in groundwater, reliable prediction of fluid dynamics requires a simulator capable of correctly handling highly het-erogeneous and anisotropic permeability tensors on nonorthogonal grids due to the complex geology of the aquifer. To solve the equations that constitute the flow model, simplifying assumptions must be made about the aquifer andthe physical processes that govern groundwater flow. In this study, we applied an improved numerical formulation that deals with highly heterogeneous and anisotropic media and can handle distorted grids. The governing equa-tions are solved via an implicit pressure and explicit concentration procedure, where the advective term is solved using a Monotonic Upstream Centered Scheme for Conservation Laws (MUSCL) type method. This method isbased on a gradient reconstruction obtained by a least square technique in which the monotonicity is enhanced by amultidimensional limiting process (MLP). The essence of the present limiting strategy is to control the distributionof both cell-centered and cell-vertex concentration in a multidimensional way to flow physics. Is showed in theliterature that this strategy satisfies the local extremum diminishing condition in a truly multidimensional manner.The dispersion term is discretized by a nonlinear two-point flux approximation method (NL-TPFA). This methodis very robust and able to exactly reproduce piecewise linear solutions through a linear-preserving interpolationwith explicit weights. The methods can be used with general polygonal meshes, although we restrict ourselvesto conformal triangular and quadrilateral grids. To validate the adopted formulations, some benchmark problems found in literature are solved. These numerical experiments indicate that our formulations can provide robust so-lutions for simulating groundwater solution processes, especially in aquifer systems with complex physical and geological properties. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5220 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5220/4290

oai:publicacoes.softaliza.com.br:article/5222 2024-05-29T12:47:15Z cilamce2022:ART

Analysis of the nonlinear vibration of a clamped cylindrical shell considering the influence of the internal fluid and oceanic waves Montes, R. O. P. Pedroso, L. J. da Silva, F. M. A. Cylindrical shells Fluid-structure interaction Nonlinear vibrations Dynamic response Analytical- numerical study Cylindrical shells are used in various engineering installations, such as nuclear power plants, tanks,cooling towers and oil platforms, which can fluid-filled. In addition, offshore structures are subject to the incidenceof ocean waves, which can change their dynamic response. Due to the slenderness of the cylindrical shells, theinteraction between these structures and the fluid presents a complex dynamic behavior, and understanding thesephenomena is of great interest for the development of these designs. This article presents an analytical-numericalcomparative study to analyze the nonlinear vibrations of a clamped cylindrical shell, considering the effects of thepresence of an internal fluid, that is incompressible, non-viscous and irrotational, and its free surface. It is alsoapplied to the outer side walls of the cylindrical shell, a load from the action of ocean waves, which are derivedfrom the Airy theory and are time dependent. To describe the deformation field and curvature changes of themiddle surface of the cylindrical shell, the nonlinear Sanders-Koiter theory was used. Chebyshev polynomials are applied to define the modal expansions that describe the displacement field of the structure. Finally, the Rayleigh-Ritz method is used to obtain the nonlinear equations of motion of the system. The free vibrations were compared with a numerical model obtained by the Finite Element Method (FEM), with the aid of the commercial softwareANSYS. As a response of the nonlinear analysis, the response in time and phase-plane is obtained for thecylindrical shell with the presence of the internal fluid and the action of ocean waves, in addition to evaluating theinfluence of two types of waves, for shallow and intermediate waters. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5222 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5222/4291

oai:publicacoes.softaliza.com.br:article/5223 2024-05-29T12:47:15Z cilamce2022:ART

Local Homogenization of Composite Materials Rodrigo Mero Sarmento da Silva Matheus Barbosa Moreira Cedrim Aline da Silva Ramos Barboza composite materials local homogenization The homogenization process has as its basic premise to change multiphase materials into a singlematerial with a representative phase, regardless of which model is being used, whether based on the theory ofelasticity, solid mechanics, or the mean-fields micromechanics models. These models, however sophisticated theymay be, takes into account the interaction between the inclusions, the geometry of the inclusion up to the physicalnonlinearity of the problem, which is always associated with the geometric limitation of the global model. Tocircumvent the geometric problem, it is proposed the development of a homogenization process that takes intoaccount the geometry of the problem, in addition to the volumetric fractions and properties of each phase. Thisconsideration is given by the generation of a quadtree recursive spatial subdivision, where the mesh nodes representthe inclusions and the elements connected to the nodes represent the matrix. With this, it can be shown thereduction of the global problem to a local problem of the Eshelby equivalent inclusion and homogenize of themesh node by node. The obtained results are a map of properties homogenized locally since each node has differentvolumetric fractions for each problem of equivalent inclusion. This procedure opens a range of differentpossibilities of materials, including the application in multiphase cementitious composite materials. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5223 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5223/4292

oai:publicacoes.softaliza.com.br:article/5224 2024-05-29T12:47:14Z cilamce2022:ART

Wind load effects on photovoltaic modules Juan M. Podesta Javier L. Mroginski Hugo G. Castro Adrian R. Wittwer Wind loads Photovoltaic modules Finit element method Wind loads are a major concern regarding steel structures, which is the case of the photovoltaic modules.These devices have been studied using different approaches in order to determine their aerodynamic characteristics.Nevertheless, the argentine regulation in this aspect (CIRSOC 102 Ed. 2005) does not contribute with detailedspecifications for unconventional structures. In order to provide more data about the influence of the photovoltaicmodule aerodynamics on its constitutive structural elements, an interdisciplinary approach is presented to definethe aerodynamic properties and the mechanical states of a specific model of the photovoltaic module. In the firstplace, the pressure coefficients obtained experimentally in the Wind Tunnel by other authors were used to determinethe most hostile wind loads applied to the studied panel. Secondly, numerical modeling of the type structure inthe physical and geometric nonlinear field was carried out, thus obtaining the natural modes of vibration and thestructural components with critical solicitation. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5224 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5224/4293

oai:publicacoes.softaliza.com.br:article/5226 2024-05-29T12:47:14Z cilamce2022:ART

Solution of ill-posed problem in plane wave decomposition for sound field reconstruction Augusto C. F. de Carvalho Hilbeth P. A. de Deus Marcio H. A. Gomes Eric Brandão Lorenzo F. R. Garron room acoustics inverse problems plane wave decomposition virtual microphone array sound field reconstruction Plane-wave decomposition is a recently developed technique in the field of acoustics that stems froman approximation in the inverse spatial tri-dimensional Fourier transform so that it considers that the sound fieldis represented by the superposition of plane waves traveling in well-defined directions. The calculations for thetechnique involve the solution of an ill-posed matrix equation, requiring a regularized solution for the least squaresproblem. This paper will show the implementation of the plane wave decomposition using Tikhonov regularizationin the context of a simulated and a measured impedance tube. The classical L-curve algorithm and a fixed-pointalgorithm for the calculation of the regularization parameter were investigated and compared with the goal ofdefining which technique produces the least error in this scenario. The reconstructions of the transfer functionsin both the simulated case and the measured case were realised, with the fixed-point algorithm displaying anadvantage over the L-curve with respect to reconstruction errors in both scenarios. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5226 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5226/4294

oai:publicacoes.softaliza.com.br:article/5227 2024-05-29T12:47:13Z cilamce2022:ART

Pisciculture 4.0: Technology and innovation in the fish production Lucas da Silva. Alisson Gabriel Fernandes Gadelha. Arthur Magno de Lima. Carlos Silva do Nascimento. Wallace Aquaponics Internet of Things Problem Based Learning ESP32 Pisciculture 4.0 The aquaponics system is a sustainable model of food cultivation that involves the creation of fish andplants in controlled environments (Aquaculture and Hydroponics) that require a high level of quality,maintenance, and production. This work's main objective is to present the development of a monitoring systembased on the Internet of Things (IoT) technology. It proposes the supervision of a substrate cultivation method(Media-filled bed) in which several parameters are monitored through sensors connected by the ESP32microcontroller, and actuators such as pumps and others. The system collects sensor data and stores it in adatabase. They are treated by optimization algorithms and presented in a graphical visualization WEB interface.Information is delivered in real-time, facilitating safe decision-making at the production and maintenance levelsof the aquaponics system. The framework also allows the safe presentation of time series for analysis andproduction planning. This system was developed and is being installed in a Research Base of the AquacultureEngineering and Mechanical Engineering courses with the participation of students from the Science andTechnology and Mechatronics Engineering courses at UFRN, using the PBL (Problem Based Learning)methodology. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5227 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5227/4295

oai:publicacoes.softaliza.com.br:article/5228 2024-05-29T12:47:13Z cilamce2022:ART

Multi-agent simulation of Coronavirus contamination on public transport Victor Geraldo Gomes Gray Farias Moita Coronavirus pandemic social isolation multi-agent system simulation Since the beginning of 2020, we are experiencing a worldwide pandemic of the coronavirus. Since then, healthauthorities around the world have tried to prevent people from infecting themselves with this virus. In Brazil, states andcities plan and take decisions to restrict movement or release some activities to return to normal operation. As noted, theseare decisions that can, on the one hand, harm the economy and the citizen's interpersonal relationships and, on the other,lead to overcrowding of hospitals, health chaos and more deaths. For this work, a computer simulator was developed where,together with a mathematical model and multi-agent systems, it was sought to show contamination situations in realenvironments. The simulator has an interface where it is possible to visualize people moving in a pre-establishedenvironment. The objective of this work is to add to the studies already in progress, bringing more data and informationthat can help to improve policies and actions to combat the pandemic. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5228 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5228/4296

oai:publicacoes.softaliza.com.br:article/5229 2024-05-29T12:47:12Z cilamce2022:ART

Yield design approach to uplift bearing capacity of shallow rectangular plate anchors Mateus Forcelini Samir Maghous Plate anchors Uplift bearing capacity Limit analysis Plate anchors are a widely used class of foundation systems for structures subject to uplift forces. Itsbearing capacity evaluation has been object of constant revisions in literature, notably as a result of the recentdecommission operations of large offshore structures. In this context, the present paper aims to evaluate the upliftresistance of shallow rectangular plate anchors based on the theoretical framework of limit analysis and its relatedkinematic approach. Upper bound estimates of the collapse load are obtained from a class of failure mechanismsconsidering generic discontinuity surfaces defined from the functional minimization of the uplift bearing capacity.The rock is modeled as a Tresca material with a tension cut-off criterion, whereas the lower interface of the anchorexhibits a tensile stress threshold. A parametric study is conducted to evaluate the effect of the problem mainparameters, allowing for an estimate of the ultimate pullout force for several cases. Finally, the semi-analyticalpredictions obtained are compared with available results in the literature, thus validating its application. Resultsshow that model predictions are in good agreement with available results for plates with low embedment ratios.The dependence on the tensile stress limit of the Tresca material and the interface resistance are also highlighted. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5229 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5229/4297

oai:publicacoes.softaliza.com.br:article/5230 2024-05-29T12:47:11Z cilamce2022:ART

On a High-Order Generalized Finite Element Method Andre de F. Stabile Sergio P. B. Proença GFEM/XFEM High-Order FEM Fracture Mechanics Conditioning Blending Function Method In recent years, technological development has grown exponentially. In this context, numerical methodsconsist of an attractive tool that guarantees flexibility and ease of access in modeling Science and Engineeringproblems. In particular, the High-Order version of the Finite Element Method (FEM), based upon orthogonalpolynomials as a means for constructing hierarchic approximation spaces, is of special interest, due to its highconvergence rate and adequate matrix conditioning. However, albeit FEM achieves good results in a large class of problems, it is not as adequate when non-smooth solutions are expected. Aiming to circumvent such a limita-tion, the Generalized Finite Element Method (GFEM) introduces enrichment functions, selected on the basis of a previous knowledge about the solution of the problem, in order to enlarge FEM’s approximation space. Despiteproviding scope and generality expansion to the FEM, such technique may lead, nevertheless, to ill-conditionedsystems of equations, therefore penalizing numerical precision. Taking this into account, this paper proposes amethodology for integrating positive features of the two aforementioned versions of the FEM, resulting in a stable,precise and high performing numerical tool. The methodology herein presented allows for the possibility of beingeasily implemented in previously existing codes, already designed to handle GFEM. Planar elasticity applicationsare considered – including Linear Elastic Fracture Mechanics problems, for which GFEM is more suitable – in order to demonstrate the previously mentioned convergence and conditioning properties of the proposed formula-tion. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5230 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5230/4298

oai:publicacoes.softaliza.com.br:article/5231 2024-05-29T12:47:10Z cilamce2022:ART

Numerical analysis on pollutant dispersion in naturally ventilated buildings: nonisothermal conditions Gabriela P. Bianchin Alexandre L. Braun Computational Wind Engineering Large Eddy Simulation Natural Ventilation Heat Transfer Pollutant Dispersion Pollutants dispersion and human exposure in urban areas are closely linked to urban and buildingventilation. In this sense, the main target of the present work is to study the pollutant dispersion phenomenon innaturally ventilated buildings using a numerical model considering incompressible flows with heat and masstransport. For the flow simulation, a semi-implicit Characteristic-Based Split (CBS) model is used in the context of the Finite Element Method, where linear tetrahedral elements are used in spatial discretization. The Navier-Stokes equations and the conservation equations for mass, energy and chemical species form the system of fundamental equations for the flow field. Flow turbulence is treated through Large Eddy Simulation (LES),where the Smagorinsky’s approach is adopted for subgrid scale modeling. Thermal effects on the flow field areconsidered in the momentum balance equation through buoyancy forces, which are calculated taking intoaccount the Boussinesq’s approximation. Classic examples of Fluid Dynamics and Transport Phenomena areanalyzed to verify the numerical model proposed here and a numerical investigation is performed considering abuilding model subject to natural ventilation, where pollutant dispersion and thermal effects are evaluatedsimultaneously. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5231 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5231/4299

oai:publicacoes.softaliza.com.br:article/5232 2024-05-29T12:47:10Z cilamce2022:ART

Numerical Verification for the Asian Rust Dispersion in Paraná Eduardo Oliveira Belinelli Luciano Kiyoshi Araki Nicholas Dicati Pereira da Silva Asian rust Discretization error Richardson estimator This work aims to study the discretization error of a numerical model describing the atmospherictransport of the Asian Rust spores in Parana. The model was obtained from the discretization of a two-dimensional ́Partial Differential Equation with diffusive, convective, and reactive terms by the finite difference method. To studythe behavior of the discretization error, a priori and a posteriori analyzes were performed. From the verificationprocess, it was found that the apparent order converged to the asymptotic order. Thus, the process of estimatingnumerical errors through the Richardson Estimate presented promising results. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5232 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5232/4300

oai:publicacoes.softaliza.com.br:article/5233 2024-05-29T12:47:09Z cilamce2022:ART

Analysis of Convergence Diagnostics for MCMC methods Douglas S. de Albuquerque Renato S. Silva Convergence MCMC Hellinger distance Strategies The most used method in Bayesian inference is the Markov Chain Monte Carlo (MCMC). But theyare expensive, not only because they require a lot of simulations of the model to explore the posterior distributionbut also because there are no clear criteria to determine if the method has converged to ensure the quality of theobtained parameters and error estimates. This work objective is to explore a set of convergence diagnostics orMCMC methods and their strategies for a convection-diffusion model and an epidemiological model, a SIR-typemodel. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5233 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5233/4301

oai:publicacoes.softaliza.com.br:article/5234 2024-05-29T12:47:08Z cilamce2022:ART

A new dual boundary element formulation for cohesive crack propagation Gustavo O. Daumas Guilherme H. Teixeira Rafael M. Lins Sérgio G. F. Cordeiro Francisco A. C. Monteiro dual boundary element method cohesive model path-following methods A cohesive dual boundary element formulation is presented for crack propagation analysis and a path-following method is proposed to solve the nonlinear system of equations by the direct control of one of the known degrees of freedom. The simple linear cohesive model is introduced into the algebraic boundary element equationsby local stiffness matrices. According to the cohesive law, the stiffness coefficients decays as crack displacementdiscontinuities increases. The acting loads are divided into two groups: one in which the load is perfectly knownand another in which only the direction is known. The magnitude (or load factor) of the latter is determined withrespect to the equilibrium of the boundary fields (indirectly controlled) and an additional path-following constraintequation. The resulting non-linear system is solved using an incremental iterative scheme. For each iteration, thecorrections to the boundary fields are obtained in a partitioned manner, in which the load factor is calculatedindependently using the direct control of the degree of freedom as the path-equation. The results show that theproposed approach can efficiently capture the equilibrium curves. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5234 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5234/4302

oai:publicacoes.softaliza.com.br:article/5235 2024-05-29T12:47:07Z cilamce2022:ART

Structural Damage Identification based on the Curvature Matrix of the Accelerance Juan C. Herrera Damage identification FRF Taylor series Finite Element In this work, a damage identification method based on the curvature-matrix of the Frequency ResponseFunction-FRF is proposed. This is used in the formulation of two indices to predict the damage location and toestimate the severity of the damage in a structure. To evaluate the effectiveness of the method, numerical simulations are performed in different damage scenarios simulated in a one-storey, one-bay frame using Euler-Bernoulli beam elements. The structural damage is simulated by reducing the flexural stiffness of selected elements. The FRF-Accelerance for the undamaged and damaged frame is numerically obtained with thefrequencies and mode shapes of the lower modes. The curvature of the FRF is calculated numerically using finitedifferences, based on an expansion of the Taylor series. The results of the simulations indicate that the proposedmethod can localize and estimate the damage severity in a one-storey, one-bay frame. The proposed damageindices could be an alternative to the traditional modal analysis methods. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5235 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5235/4303

oai:publicacoes.softaliza.com.br:article/5236 2024-05-29T12:47:05Z cilamce2022:ART

A numerical study of damage evaluation in jointed plain SHCC pavements using new damage evolution laws Edmir J. Santos Júnior Rafael Marques Lins Francisco A. C. Monteiro Sérgio Gustavo Ferreira Cordeiro jointed plain SHCC pavements load transfer damage plasticity damage evolution laws It is well-known in the design of jointed plain cementitious pavements (JPCP) that the damage in thecementitious matrix due to stress near the dowel bars is a key factor that affects the service life of suchstructures. This study aimed to evaluate numerically the differences in the damage distribution in the near dowelbar region in JPCP considering alternative materials: strain-hardening cementitious composites (SHCC) insubstitution to concrete and glass fiber reinforced polymer (GFRP) in substitution to the steel bar. The adoptedconstitutive model for the cementitious materials was the concrete damage plasticity. A new damage evolutionlaw proposed by the authors in [13] was adopted. Such a law can be very effective in reproducing the SHCCbehavior because both damage and plastic strain variables are involved with. Interactions between thecementitious matrix and the dowel bars were simulated by surface-to-surface contact type. The finite elementmodels were validated by comparing available experimental load-displacement curves with the obtainednumerical ones. The results for the damage distributions reveal that the use of such alternative materials hasinduced smaller damage values within a smaller damaged zone when compared with the model withconventional materials: standard concrete and steel bars. Consequently, smaller cracks in such zones will appearwhich will increase the structural life of the pavement. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5236 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5236/4304

oai:publicacoes.softaliza.com.br:article/5237 2024-05-29T12:47:04Z cilamce2022:ART

Nonlinear dynamic structural analysis of tall buildings considering the nondeterministic wind-induced actions Jean Carlos M. Silva José Guilherme S. da Silva tall buildings geometric nonlinearity soil-structure interaction buildings dynamic analysis In recent decades, technological advances in civil construction have driven the project and constructionof tall buildings in several countries around the world. However, the structural design slenderness increasing hasbeen crucial for reducing the natural frequencies values and the damping structural levels generating, in somesituations, excessive vibrations and human discomfort. Aspects generally disregarded in current day-to-day designpractice are related to the geometric nonlinearity effect and the soil-structure interaction on the tall buildingsstructural response. Thus, this investigation aims to evaluate the dynamic structural behaviour of a steel-concretecomposite building with 48 floors and 172.8 m height, when subjected to wind nondeterministic actions, includingin the dynamic analysis the geometric nonlinearity effects and the soil-structure interaction. The investigatedbuilding numerical model was developed to obtain a more realistic representation of the structural system, basedon the Finite Element Method (FEM), using the ANSYS program. In this investigation, the found results, basedon the calculated displacements and accelerations values, have indicated relevant differences, when the geometricnonlinearity effects and the soil-structure interaction were included in the building dynamic response assessment. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5237 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5237/4305

oai:publicacoes.softaliza.com.br:article/5238 2024-05-29T12:47:03Z cilamce2022:ART

Nonlinear dynamic analysis of storage tanks when subjected to nondeterministic wind loadings Matheus A. Lopes Francisco José da C. P. Soeiro José Guilherme S. da Silva storage tanks laser scan inspection nonlinear dynamic analysis integrity assessment Storage tanks are associated to thin-walled equipment subjected to wind-induced loads, which canlead the system to structural instability. The storage tanks behavior is too sensitive to imperfections that can bepresent on the structural system, taken into account damage mechanisms which tend to reduce the integrity ofthis type of equipment along its service life. In fact, inspection techniques are employed to characterize thedamage mechanisms. This way, the laser scan technique has been shown to be accurate in dimensionalinspection of storage tanks. Therefore, this research work focuses on the nonlinear dynamic analysis of an actualdamaged surface related to a storage tank. The investigated tank presents a diameter of 43.428 m and height of14.63 m, and is used for diesel storage. The deformations present on the tank structure were measured based onthe use of a laser scan. The point cloud resulting from the dimensional laser scan inspection was used to build afinite element model taken into account all geometric imperfections. After that, the nondeterministic windloadings were used to perform the nonlinear dynamic analysis considering the actual deformed structural systemof the studied tank. In this investigation, the results have indicated relevant differences, when the geometricnonlinearity effects were included in the structure dynamic response assessment, when compared to thosecalculated based on the traditional static analysis. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5238 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5238/4306

oai:publicacoes.softaliza.com.br:article/5239 2024-05-29T12:47:02Z cilamce2022:ART

Steel-concrete composite floors dynamic assessment when subjected to human walking loads Jefferson V. Aguiar Bárbara E. Ferreira H. Carvalho José Guilherme S. da Silva experimental tests finite element modelling buildings floors This work aims to evaluate the people-structure dynamic interaction effect on the floor’s structuralbehaviour, considering the development of experimental tests and also numerical modelling. This way, the investigated structural model is related to a steel-concrete composite floor building which is composed of a hot-rolled framing system, with a total area equal to 1300 m2. The floor system is used for normal school occupancy and is supported by steel-concrete composite columns with a ceiling height of 3.40 m. In this investigation, thebiodynamic models associated with “spring-mass-damper” systems with one degree of freedom (SDOF) wereadopted aiming to represent the people’s walking on the investigated floor. The proposed numerical model,developed for the steel-concrete composite floor building dynamic analysis, adopted the usual mesh refinementtechniques present in finite element method (FEM) simulations implemented in the ANSYS computationalprogram. Considering the experimental results calibration, the investigated floor dynamic response wasevaluated based on a parametric study, to study the influence of the people’s step frequencies, number of peoplewalking and stationary on the floor, structural damping, and also different trajectories of people walking on thestructure. The composite floor dynamic response was determined based on the displacement and accelerationvalues, and the results were compared with those calculated utilising the traditional dynamic loadingmathematical models (“only-force models”); and with recommended limits for excessive vibrations related to thedesign codes, aiming to assess the floor human comfort. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5239 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5239/4307

oai:publicacoes.softaliza.com.br:article/5240 2024-05-29T12:47:01Z cilamce2022:ART

Micromechanical Approach to the Effective Poroelastic Behavior of Jointed Rock Masses under One-Dimensional Consolidation and Finite Element Implementation Augusto B. Borges Samir Maghous jointed rock microporoelasticity finite element method one-dimensional consolidation A micromechanics-based formulation of the macroscopic behavior of saturated jointed rocks regardedas homogenized anisotropic poroelastic media is presented. At the material level, the rock matrix forming theskeleton phase of the porous medium is assumed to be linear elastic, whereas the crosscutting joints stand forthe porous space and are viewed as planar interfaces endowed with a specific generalized poroelastic behavior.The effective anisotropic poroelastic properties, including the homogenized drained elastic stiffness tensor C, Biottensor B, Biot modulusM, as well as the permeability tensor K of the jointed medium are derived. At the structurelevel, the consolidation problem of a jointed rock layer is addressed in a one-dimensional setting with anisotropicflow conditions introduced by joints orientations. For verification purpose, the analytical predictions derived fromthe analysis are compared with finite element solutions implementing the effective constitutive state equations,thus emphasizing that the analytical predictions can be viewed as reference solutions. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5240 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5240/4308

oai:publicacoes.softaliza.com.br:article/5241 2024-05-29T12:47:00Z cilamce2022:ART

Evaluation of Structural Dynamic Modification by Viscoelastic Neutralizers based on Response Reanalysis Methods I. G. Soares E. M. O. Lopes Response Reanalysis Structural Modification Vibration control Viscoelastic material Viscoelastic neutralizer Structural modifications can occur for several reasons, such as unsatisfactory product for the customer,structural defects, updating of obsolete parts, generation of intense noise from the equipment to the operator, and unwanted vibrations. When there is some prior knowledge of the dynamic characteristics of the mechanical sys-tem of interest, particularly in association with the region where the changes will occur, a practical and convenient approach is to analyze the effects of these changes using reanalysis techniques. These techniques aim to predictthe dynamic behavior of the system after implementing modifications, from a compact and specific set of data related to the system and the modifications. The present work aims to investigate the use of two response reanal-ysis techniques - in matrix formulation - to evaluate the effects of inserting viscoelastic dynamic neutralizers as localized structural modifications. Viscoelastic neutralizers are considered in the context of future implementationof vibration control on a cantilever steel beam. In modeling the neutralizers, concepts of generalized equivalentparameters are used to maintain the same dimension in the system matrices before and after inserting the devices. To validate the use of the employed techniques, their predictions are compared to the results obtained by an es-tablished computational program dedicated to the optimal design of dynamic neutralizers in mechanical systems, named LAVIBS-ND®. It is shown that the investigated techniques do not differ, as far as their predictions are con-cerned, from the technique currently used in the above mentioned program, which is employed as a benchmark to assess the accuracy of the evaluated methods. It is then concluded that the focused techniques are actually capableof accurately predicting the effects of structural modifications by viscoelastic dynamic neutralizers for vibrationcontrol purposes. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5241 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5241/4309

oai:publicacoes.softaliza.com.br:article/5242 2024-05-29T12:46:59Z cilamce2022:ART

A new approach for the Modified Local Green’s Function Method applied to Poisson equation Ramon Macedo Corrêa Marcos Arndt Roberto Dalledone Machado Green Functions Modified Local Green’s Function Method Finite Element Method Boundary Ele- ment Method Originally proposed at the end of the 80 ’s, the Modified Local Green’s Function Method (MLGFM) isan integral method that was described as a hybrid of the Finite Element Method (FEM) and the Boundary ElementMethod (BEM). The method was proposed to apply the BEM methodology to problems with no knowledge ofthe fundamental solution. Essentially, the MLGFM creates discrete projections of the Green’s function solvingan auxiliary domain problem, and this problem can be solved, for example, by the FEM formulation. Despite thegood convergence of the secondary variable in the boundary, the method has a major disadvantage over FEM, theobtainment of the Green’s function projections implies in to solve the system of equations in the domain, resultingin a great computational effort. However, this paper aims to show a new approach to the MLGFM where it isnot necessary to obtain the Green’s projections and the final equations system has the same number of degreesof freedom as FEM and still presents high convergence for the secondary variable in the boundary. The newformulation can be obtained directly by the weighted residual sentence and variables using the same approximationof the original MLGFM. The processing time of the two approaches are compared and the method is applied toPoisson Equation. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5242 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5242/4310

oai:publicacoes.softaliza.com.br:article/5243 2024-05-29T12:46:58Z cilamce2022:ART

Evaluation of Numerical Parameters of a global-local GFEM approach simulating damage propagation in a L-shaped concrete panel Anelize B. Monteiro Felício B. Barros Roque L. S. Pitangueira Samuel S. Penna GFEM global-local nonlinear analysis Continuous Damage Mechanics The nonlinear modeling of concrete structures requires strain-softening models that properly representthe nucleation and propagation of damage. The description of those phenomena, by Finite Element Method (FEM),is highly dependent on the quality of the mesh and the type of the approximation function adopted. The GeneralizedFinite Element Method (GFEM) has been developed in order to overcome some limitations inherent to the FEMaiming to use some knowledgment about the expected solution behavior to improve the analysis. The GFEMenriches the space of the polynomial FEM solution with a priori known information based on the concept ofPartition of Unit. In this context, the global-local approach to the GFEM (GFEM global-local) is investigated hereas an alternative to the standard GFEM to describe the deterioration process of concrete media in the context ofContinuous Damage Mechanics. Succinctly, the global-local function used to enrich the global problem is obtainedthrough physically nonlinear analysis performed only in the local domain, represented by constitutive models anddiscretized by a refined mesh, where in fact damage propagation occurs. In the global domain discretized by a coarse mesh, it is performed a linear analysis considering the incorporation of local damage through the global-local enrichment functions and damage state mapped from local problem. In this paper, the Smeared Crack Model is the constitutive model used in the local domain to simulate the damage propagation experimentally obtained inan L-shaped concrete panel. The numerical simulations aim to evaluate the influence of the following numericalparameters of the GFEM global-local approach on the equilibrium paths: number of local steps added to each blockof global-local analysis and the size of the global step. The obtained results are compared with the experimentalones, the most suitable sets of parameters can be found and then applied in other simulations that involve theexpansion of the local domain and the variation of the nodes enriched with the global-local function. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5243 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5243/4311

oai:publicacoes.softaliza.com.br:article/5244 2024-05-29T12:46:57Z cilamce2022:ART

Two-dimensional nonlinear analysis of elastic columns stability using the convected particle domain interpolation material point method Lucas P. de Souza Marco A. Argenta Buckling Columns Convected particle domain interpolation Material point method Stability This paper presents an elastic two-dimensional analysis of columns stability, using an extension of thematerial point method (MPM), called convected particle domain interpolation (CPDI). As instability phenomena require a large-deformation study, MPM is chosen by its ability to deal with this situation, using a simple and reg-ular cartesian background grid to calculate the spatial gradients and divergences, besides automatically considers explicit dynamics. The CPDI extension is applied in order to facilitate natural boundary conditions treatment and to avoid the cell-crossing error, since the subdomains are explicitly tracked through the analysis and the shape func-tions have continuous derivatives into these subdomains. A computational routine is implemented using Python 3 language, employing Euler-Gauss explicit time integration and update-stress-last (USL) scheme. A rectangular-section slender column is submitted to 4 different load cases. The results obtained are the load-displacement behavior of the columns and its total mechanical energy time variation, which are validated by comparison withthe results produced by classic analytical Euler’s theory. It can be verified, after the analyses, that CPDI MPM isable to predict the columns buckling loads and to reproduce the post-critical instability phenomena with a goodaccuracy. The conservation of energy is achieved in all tests. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5244 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5244/4312

oai:publicacoes.softaliza.com.br:article/5245 2024-05-29T12:46:57Z cilamce2022:ART

Tri-objective optimization of steel frames with the bracing system configuration as a design variable Claudio H. B. Resende Afonso C. C. Lemonge Patrícia H. Hallak Jose P.G. Carvalho Julia C. Motta Luiz F. Martha 3D-steel frames Multi-objective optimization Maximum displacement Global stability Bracing systems In steel structural design, especially concerning tall buildings, it may be desired to minimize its cost andimprove its performance concerning horizontal displacements, dynamic behavior, and structural stability. Also, thepredefinition of which bracing system geometric configuration is more suitable for each objective is not evident,and usually, it is made according to the designer’s experience. Thus, solving this problem considering different cases of three simultaneous objectives is not a trivial task. Therefore, this paper deals with the tri-objective op-timization of spatial steel frames, considering the bracing system configuration as a design variable. The third evolution step of generalized differential evolution (GDE3), the success history-based adaptive multi-objectivedifferential evolution (SHAMODE), and the multi-objective meta-heuristic with iterative parameter distributionestimation (MM-IPDE) are the differential evolution algorithms adopted in this paper. In addition, a multi-criteriatournament method is used to extract desired solutions from the Pareto front according to the decision-makerpreferences. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5245 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5245/4313

oai:publicacoes.softaliza.com.br:article/5246 2024-05-29T12:46:56Z cilamce2022:ART

Truss chords buckling Mauriz Alexandre Júnior buckling lenght factor truss chord stability structural engineering civil construction The present work proposes reducing coefficients on the buckling length of trusses chords when thenormal acting on these chords is not constant throughout the chord. The normal maximum is considered actingon the entire compressed part of the chord, but with a reduced buckling length. In this text, it is obtained anequivalent normal, which, constant in the chord, generates the same deformation energy as the acting variablenormal. This equivalent normal has a value lower than the maximum acting normal. It is made, then, the proportion to obtain the reduced buckling length to consider. It is solved, step by step, the case of the double-supported truss under point load in the middle of the span and shown the results for the double-supported truss under uniformly distributed load and the two-span continuous truss, also under uniformly distributed load. Thesolution of the differential equation with the variable normal in the chord, exact, of difficult solution, is alsoshowed to notice the validity of doing the procedure via energy, approximate. An illustrative numerical exampleof the application of these buckling length reduction coefficients is shown to easy the practice. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5246 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5246/4314

oai:publicacoes.softaliza.com.br:article/5247 2024-05-29T12:46:56Z cilamce2022:ART

An Efficiency Study of the Radial Polynomial Expansion Method for Solv- ing Singular Integrals in the Dual-BEM Beatriz B. F. Fonseca Rodrigo G. Peixoto Singular Integrals Radial Polynomial Expansion Method Dual Boundary Element Method In the Boundary Element Method (BEM), when the element which is being integrated contains thesource point, singularities arise in the integrals that govern the problem. Although several classical methodshave already been proposed and successfully used, their numerical implementation is laborious and often requiresparticular codes for each type integral kernel. Recently, a method that allows the solution of integrals with differentsingularity orders in a single numerical procedure has been proposed. It is based on the polynomial expansionof the radial distance between the source and field points and it is called here as Radial Polynomial ExpansionMethod (RPEM). The RPEM has its efficiency studied for application to the Dual-BEM. Elements with quadraticinterpolation functions are analyzed. The efficiency is verified in terms of the element distortion and the numberof terms needed in the expansion. For this, the method is implemented in a computational code in Fortran 95 andthe results are compared with other formulations, such as the singularity subtraction method. Once the reliabilityand applicability of the method have been proven, it is intended to apply the solutions found in a Dual-BEM code,for the analysis of fatigue crack propagation. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5247 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5247/4315

oai:publicacoes.softaliza.com.br:article/5248 2024-05-29T12:46:55Z cilamce2022:ART

Recent Advances in a Multiscale Flux-Based Method for Simulating Flow in Fractured Porous Media Nathan Shauer Jose B. Villegas S. Sonia M. Gomes Philippe R. B. Devloo Discrete Fracture Networks Porous Media Flow Multiscale Method Mixed Finite Elements Computational simulation of reservoir flow is an important tool that provides valuable insight into thedecision process in oil extraction. Several types of commercial software have been developed over the years for thisapplication, the majority using low-order schemes, which can become prohibitive for very large models. This issuebecomes more apparent since, nowadays, the accuracy of a simulator is dominated by the accurate simulation of themultiscale characteristics of a reservoir such as permeability heterogeneity. To capture these multiscale features inlow-order schemes, very refined models are required. Therefore, developing a high-order scheme able to simulatefractured reservoir flow that is accurate and can efficiently capture the multiscale features of the reservoir is of greatvalue for the field. With this motivation, this presentation reports on recent advances in a methodology to simulateflow in highly heterogeneous fractured porous media using the Multiscale Hybrid-Mixed (MHM) method withH(div)-confirming flux approximations. This method is particularly appealing because of its inherent propertiessuch as local mass conservation, multiscale features, and strong divergence-free enforcement for incompressibleflows. Flow in the porous media is modeled with traditional Darcy’s equations and the coupling between flowin the porous media and fractures is based on the conceptual Discrete-Fracture-Matrix representation, where thefractures are idealized as lower-dimensional elements at the interface of matrix elements. The methodology iscompared with benchmark examples to demonstrate its robustness, accuracy, and efficiency. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5248 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5248/4316

oai:publicacoes.softaliza.com.br:article/5249 2024-05-29T12:46:55Z cilamce2022:ART

A reducer order model approach for fuzzy field seepage analysis Nataly A. Manque Matthias G.R. Faes Marcos A. Valdebenito Pierre Beaurepaire Fuzzy field seepage analysis reduced order model This contribution proposes a strategy for performing seepage analysis where uncertainty associatedwith permeability is characterized by means of fuzzy fields. In order to decrease numerical costs associated withuncertainty propagation, full system analysis is replaced by a reduced order model. This reduced order modelprojects the equilibrium equations to a small-dimensional space, which is constructed using a single analysis ofthe system plus a sensitivity analysis. The associated basis is enriched to ensure the quality of the approximateresponse. A simple numerical example shows that with the presented strategy, it is possible to accurately estimatethe fuzzy seepage flow with reduced numerical efforts. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5249 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5249/4317

oai:publicacoes.softaliza.com.br:article/5250 2024-05-29T12:46:54Z cilamce2022:ART

Study on the modeling of the actuation system of a quadrotor Vitor Tucci Ramos Reginaldo Cardoso Decio C. Donha Actuator Modelling Integral Backstepping Quadrotor This work compares the actuator model based on constants, the non-linear model of the actuator’scomponents, and the experimental data. The actuation model is composed of the following components: electronicspeed controller (ESC), motor and propeller. The non-linear modeling of the ESC will be done using the pulsewidth modulation signal (PWM) as input and the current as output. These current will be the input of the motorwhich will have as output the angular velocity which will be the input of the propeller model which will haveas output thrust and torque. A helical trajectory was defined as a desired in the simulation. In both models, theintegral backstepping control was applied. A comparison criterion was used the power consumption, which is oneof the major barriers of these types of vehicles. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5250 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5250/4318

oai:publicacoes.softaliza.com.br:article/5251 2024-05-29T12:46:54Z cilamce2022:ART

Bimoment loads on space frame elements Maicon José Hillesheim Francisco Célio de Araújo Nonuniform torsion composite bars with variable cross sections the BEM torsion-related element stiffness matrices This paper presents an algorithm based on the Direct Stiffness Method to solve bars with compositevariable cross sections under nonuniform torsion. In this formulation, the primary and secondary torsion modesare described by 2D Neumann's boundary-value problems, which are solved at the cross-section level byemploying the BEM. The torsional rotation angle along the element length is described by a set of ordinarydifferential equations, which are solved by using weighted residual techniques. Herein, a nth-order polynomial isadopted to approximate the torsion angle function. In this paper, we will especially assess the effects of externalbimoment loads on the calculation of stresses along the beam. Accuracy of the formulation is observed bycomparing results obtained with the present beam formulation and 3D solid ANSYS models. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5251 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5251/4319

oai:publicacoes.softaliza.com.br:article/5252 2024-05-29T12:46:53Z cilamce2022:ART

Modeling and Numerical Simulation of Drug Transport and Absorption in a Tumor Daniela Cortes Giuseppe Romanazzi Drug Transport and Diffusion Drug Uptake in Tumor Cells Finite Difference Method This work describes the diffusion-convection process of transport of the drug (doxorubicin) administeredby bolus injection through the tumor and interstitium. We numerically solve a coupled system of partial differentialequations that models the drug transport, its uptake, and effect in the tumor.It is used a high order finite difference method that allows to accurately describe the drug effect in the tumor.In fact, we can determine the time needed by the drug to reduce the tumor cell density and approximate the drugspatial distribution in the tumor and interstitium. In addition, the simulations shows how the doxorubicin effect inthe tumor increases as its dose level increases. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5252 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5252/4321

oai:publicacoes.softaliza.com.br:article/5253 2024-05-29T12:46:53Z cilamce2022:ART

On a kinematically exact rod model for thin-walled open section members: incorporating polyconvex constitutive equation Marcos P. Kassab Eduardo M. B. Campello Paulo M. Pimenta Kinematically exact rod models thin-walled rods polyconvex constitutive equation In the current work, advances on kinematically exact rod models for thin-walled open section members, taking into account both primary and secondary cross-sectional warpings, are proposed. Advanced elastic consti-tutive equations are incorporated in order to enable full bending, compression and torsional strain couplings in the finite strain regime. The paper extends a previous contribution by the authors (Kassab and Campello [1] ”On a kinematically exact rod model for thin-walled open section members”, CILAMCE-PANACM-2021) by incorpo-rating a more advanced constitutive equation, now based on the polyconvex neo-Hookean Simo-Ciarlet’s material. The older version contemplated only linear elastic and Saint-Venant ́s constitutive equations, which are known forbeing unsuited for truly finite strains. Differently from what was performed in a past attempt, all the terms of theconstitutive equation were retained. The model was implemented in PEFSYS, which is an in-house FEM program.Validation is performed using existing results from the literature as well as solutions obtained with the Ansys’sshell 281 element. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5253 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5253/4322

oai:publicacoes.softaliza.com.br:article/5254 2024-05-29T12:46:53Z cilamce2022:ART

Comparative experimental and numerical analysis of pile under lateral load in granular soil in Chilca, Perú Patricio Sanchez Mario Peña Marko López Jorge Zegarra Abaqus lateral load pile numerical analysis p-y Piles are frequently used in low resistance soils and often are subjected to lateral loads from differentphenomenon as wind, waves, earthquakes events, ground lateral pressure, etc. Lateral resistance of piles should beanalyzed to guarantee the stability by theoretical methods or in situ tests for correct design. These investigationcompares the deflection results of a lateral load test with the responses in ultimate limit state, p-y and finite elementmethod to serve as an example that the different procedures, some more than others, provide a real approximationto the behavior of the pile under lateral load, therefore carry out an optimal design. The test to analyze experimentalbehavior was carried out in Chilca, to the down south of Lima in Peru, where full-scale load test provides a solidbasis for understanding the problem. The geotechnical characterization was carried out with SPT field tests andseismic refraction results. The properties of the tubular A572 grade 50 steel pile are known for being standardized.Pile under lateral load test followed the guidelines of the ASTM D3966 standard. The analytical and numericalcalculations were compared with the experimental measurements through graphs of displacements along the pile,these by performing 3D numerical analysis with the commercial program Abaqus® using elastoplastic constitutivemodel with Mohr Coulomb failure criterion for the FEM, using GEO5® to solve the subgrade reaction approach(p-y) problem using Matlock and Reese approximation as soil modulus, at last for the ultimate limit state, Bromsand Meyerhof formulations for flexible piles were used. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5254 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5254/4323

oai:publicacoes.softaliza.com.br:article/5255 2024-05-29T12:46:52Z cilamce2022:ART

APPLICATION OF THE NEWMARK INTEGRATION METHOD TO DETERMINE THE DYNAMIC RESPONSE OF A COMPLETE VEHICLE MODEL SUBJECTED TO THE EXCITATION OF A RANDOM ROAD PROFILE ACCORDING TO ISO 8608 José Marcelo M. L. Rodrigues Letícia F. F. Miguel Dynamic response Complete vehicle model ISO 8608 Newmark method When analyzing a vehicle traveling on a lane, irregularities in this lane can expose the driver tovibrations that can result in health damage. This implies the need for a suitable suspension system. This study isjustified by the fact that the determination of the dynamic response of vehicles traveling on irregular lanes allowsus to understand the behavior of the vehicle in terms of displacement, velocity and acceleration as a function oftime. The general objective of this study is to determine the dynamic response of a complete vehicle modelsubjected to the excitation of a random road profile, according to the ISO 8608. The specific objectives are: (I) Toreproduce a vehicle model; (II) Determine a random road profile; (III) Apply the Newmark method. Themethodology of this study consists of simulating the vehicle in Matlab software and validating this model. Applythe random road profile as road excitation. Determine the dynamic response using the Newmark Method. As aresult, the dynamic response of the vehicle subjected to the excitation of a random road profile was obtained. It isconcluded that it was possible to complete the specific objectives, reaching the general objective. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5255 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5255/4324

oai:publicacoes.softaliza.com.br:article/5256 2024-05-29T12:46:52Z cilamce2022:ART

Numerical analysis of optimum designed models of viscoelastic supports for rotating machines Bruno F. A. Prado Carlos A. Bavastri Eduardo A. Ribeiro Rotordynamics Passive vibration control Viscoelastic materials Optimization Viscoelastic supports Viscoelastic supports (VES) are a simple solution for vibrations in rotating machinery with a lowassociated cost. The objective of this work is to complement an optimal design methodology for VES, developedby the GVIBS/UFPR group for rotating systems subject to unbalanced excitations, inserting a static stiffness inparallel, whose purpose is to increase the load capacity of the device. The dynamic behavior of the rotating systemis represented through the finite element method. For the viscoelastic material, the fractional derivatives model offour parameters is used, which allows considering the effect of temperature and excitation frequency. For theoptimal design, the concept of generalized equivalent parameters (GEP) is used, allowing to describe the equationof motion of the composed system with VES, being able to obtain the response of the composed system in a spaceor subspace of the primary system, efficiently from a computational time perspective. The primary system ismodeled considering a simple rotor and the support is introduced via GEP. Nonlinear techniques allow for optimaldesign of the VES. Numerical simulations on rotors with known dynamic behavior allow showing the results ofthe proposed methodology and the effectiveness of viscoelastic supports. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5256 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5256/4325

oai:publicacoes.softaliza.com.br:article/5257 2024-05-29T12:46:51Z cilamce2022:ART

Some modeling features for two-dimensional isoparametric and isogeometric finite element analysis João Carlos L. Peixoto Danilo S. Bomfim Rodrigo L. Soares Luiz F. Bez Pedro C. F. Lopes André M. B. Pereira Rafael L. Rangel Luiz F. Martha finite element modeling isoparametric and isogeometric analysis Python application educational software This work describes some modeling features of an interactive graphics system for finite elementsimulations in two dimensions. The specific objective of this article is to describe the strategy for domaindecomposition into patches ready for isoparametric and isogeometric analysis. The main objective of this systemin the future is to provide students and researchers of computational mechanics with an open educational tool forunderstanding the integration of geometric modeling, mesh generation, finite element analysis, and visualizationof results. The presented geometric modeling resources are based on the Half-Edge topological data structure. Thesystem is developed in Python, based on the object-oriented programming paradigm, and uses the Qt user interfacesystem. Modeling is performed through the interactive creation of parametric curves of various types: polygonallines, quadratic and cubic Bezier curves, composite cubic Bezier curves, circles, circle arcs, ellipses, ellipse arcs,and NURBS (Non-Uniform Rational B-splines). The system automatically recognizes the creation of closedregions. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5257 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5257/4326

oai:publicacoes.softaliza.com.br:article/5258 2024-05-29T12:46:51Z cilamce2022:ART

A Comparison between Dual Reciprocity and Direct Interpolation Techniques for Solving the Helmholtz Problem by Frequency Scanning T. G. Balista C. F. Loeffler Neto L. O. C. Lara Boundary Element Method Dual Reciprocity Direct Interpolation The identification of the modal content of a dynamical system through the excitation frequencyscanning procedure is a very common procedure, especially with regard to experimental models. In terms ofnumerical simulation, this technique is also very accessible and computationally inexpensive. In the case of theBoundary Element Method (BEM), this procedure is much simpler than the direct solution of the associatedeigenvalue problem, if the fundamental solution is frequency-dependent since the problem becomes nonlinear. Inorder to simplify the solution of these problems with the BEM, which are stationary acoustics problemsgoverned by the Helmholtz equation, techniques were developed that use simpler fundamental solutions. Amongthese are the well-known dual reciprocity technique (DRBEM) and the more recent direct interpolationtechnique (DIBEM). Both are characterized by employing radial basis functions and thus avoiding domainintegrations generated by the reactive term of the governing equation; however, Dual Reciprocity interpolatesonly the primal variable of the problem, while the Direct Interpolation technique approximates the entire kernelof the domain integral. Although they allow the direct solution of the eigenvalue problem, this article comparesthe two techniques mentioned to solve the problem of stationary acoustics, through scanning of imposedfrequencies. The stationary data was obtained in a chosen frequency range. Error curves are obtained bycomparing numerical solutions and available analytical solutions for a more accurate assessment. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5258 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5258/4327

oai:publicacoes.softaliza.com.br:article/5259 2024-05-29T12:46:50Z cilamce2022:ART

A numerical scheme for solving a mathematical model derived from larvae- algae-mussel interactions Ramoni Z. S. Azevedo Charles H. X. B. Barbosa Isaac P. Santos Jose C. R. Silva Dayse H. Pastore Anna R. C. Costa Claudia M. Dias Raquel M. A. Figueira Humberto F. M. Fortunato golden mussel larvae-algae-mussel model Navier-Stokes equations numerical methods nonlinear system of PDEs In this work we present a numerical formulation for solving a mathematical model, derived from larvae-algae-mussel interactions in aquatic environments, proposed in [1]. The model is composed of three unsteady and nonlinear advective-diffusive-reactive equations for species densities coupled with the Navier-Stokes equations tosimulate the velocity field of the water. We employ the operator splitting technique in the finite element method context for solving the transport problem in two stages: first, given the velocity field, we solve the advective-diffusive problem to obtain the densities of larvae, algae and mussels; then, we use this first step approximation as initial condition for solving the system of ordinary differential equations for the reactions terms. In the first stage,the nonlinear stabilized finite element method CAU and the two-step Backward Differentiation Formula of secondorder are employed in the spatial and time discretizations. The nonlinear process is solved by a Picard fixed pointiteration. In the second stage, the system of ordinary differential equations for reactions is approximated by thefourth-order Runge-Kutta scheme. The numerical formulation proposed is used to simulate the 3D dynamics ofspecies proliferation and quantify the golden mussel population in a stretch of the Pereira Barreto channel, locatedin Brazil, with a focus on population control actions. The preliminary results as well as other considerations relatedto the problem and the numerical model are discussed. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5259 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5259/4328

oai:publicacoes.softaliza.com.br:article/5260 2024-05-29T12:46:50Z cilamce2022:ART

Use of Random Forest to predict the accumulation of plastic strain at grain boundaries of a polycrystalline material Lara Cristina Pereira de Araujo Renato Bichara Vieira Helon Vicente Hultmann Ayala Random Forest Accumulation of plastic strain Machine Learning Grain boundaries The main motivation is the study of the accumulation of plastic strain in the grain scale, throughthe use of machine learning. This alternative can be a significant contribution towards creating models capableof predicting the accumulation of strains. In this way, machine learning becomes a tool capable of helping tounderstand which physical parameters control damage accumulation. The objective of this study is to predict theaccumulation of plastic strains at grain boundaries using the Random Forest model. For all machine learningmodels, it is necessary to perform effectiveness tests and in this study cross-validation was used. It is a numericalwork, based on machine learning, which uses the Random Forest algorithm and cross-validation to authenticatethe model. The metric used to measure the performance of the model was the coefficient of determination (R2).Results for the predictions of the accumulation of plastic strains, when considering the same microstructure, arecoherent and of good quality. When comparing the results obtained in this work with the predictions found in theliterature, the results obtained are satisfactory. Concluded that the Random Forest model is reliable for predictingthe accumulation of plastic strains in grain boundaries of a polycrystalline material. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5260 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5260/4329

oai:publicacoes.softaliza.com.br:article/5261 2024-05-29T12:46:49Z cilamce2022:ART

Analysis of global stability of guyed towers considering unilateral constraints Fernanda Neves da Silva Frederico Martins Alves da Silva Guyed towers Unilateral constraints Non-linear static analysis Nonlinear dynamic analysis Guyed structural systems are present in several engineering applications, and as a large portion of thesestructures have a high level of slenderness, their designs are based on stability criteria. The set of cables present inthese elements are characterized by high efficiency when they are tensioned. The main objective of this study isto analyze the static and dynamic nonlinear behavior of a discrete guyed tower model with two degrees of freedom.Furthermore, the present work devotes special attention to the consideration of the unilateral contact (boundarycondition) in the nonlinear oscillations of this structure. The unilateral contact is manifested in this type ofapplication from the consideration of the capacity of the stays to resist only the traction efforts, as an effect, thisapproach strongly modifies the analysis of the proposed structural system. For this model, there is a significantinfluence of the consideration of unilateral contact on the post-critical behavior, with a marked decrease in thecritical load of the structure. Thus, the results show that this type of structure is highly sensitive to geometricnonlinearities and to the restriction of certain stays, indicating that these effects must be considered in the towerdesign phase. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5261 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5261/4330

oai:publicacoes.softaliza.com.br:article/5262 2024-05-29T12:46:49Z cilamce2022:ART

Evaluation of the Nonlinear Behavior of Concrete Structures Using a Flat Shell Finite Element Danilo Bento Oliveira Samuel Silva Penna Nonlinear Shell Total Lagrangian Smeared Crack Von Mises Concrete Structures This work presents a study of the coupling of the geometric and material nonlinearities applied in plain and reinforced concrete structures, using flat shell finite elements. For geometric nonlinearities, the prin-ciple of virtual works and a generalized finite element method (GFEM) approximation are explored to directly formulate the nonlinear governing equations in a total Lagrangian approach. The material’s behavior will bedescribed by a smeared cracking constitutive model, capable of representing the concrete degradation process,from the phenomenological approach of crack propagation. In order to evaluate variations in stresses, strains, and, consequently, degradation due to cracking along the thickness, the shell element is subdivided into N dis-crete layers, allowing the measurement of the inelastic behavior of the material. In this proposal, each layer can be represented by different materials, allowing the representation of reinforced concrete structures with the steeldescribed by a classic elastoplastic model. Finally, numerical simulations of shell structures will be presented,considering the coupling of the referred nonlinearities. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5262 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5262/4331

oai:publicacoes.softaliza.com.br:article/5263 2024-05-29T12:46:48Z cilamce2022:ART

Nonlinear analysis of inelastic frames considering a corotational approach and plasticity by layers: a discussion about computational implementation Danilo B. Cavalcanti Rafael L. Rangel Luiz F. Martha beam-column element geometric nonlinearity elasto-plasticity object-oriented programming This work presents the development of a numerical solver for nonlinear analyses of plane frame structures using the corotational formulation to take into account geometric nonlinearity and considering an elasto-plastic constitutive model. A one-dimensional rate-independent plastic model with isotropic hardening was implemented, and the cross-sections of beam-column elements were subdivided into layers to simulateplastification. The goal is to discuss the computational implementation aspects of the inelastic material behaviorin an object-oriented framework for nonlinear finite element analysis of frame structural models. A numericalexample is presented to highlight the influence of the inelastic behavior in the equilibrium path of structures. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5263 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5263/4332

oai:publicacoes.softaliza.com.br:article/5265 2024-05-29T12:46:48Z cilamce2022:ART

Numerical experiments to assess the performance of different formulations and solution algorithms for geometrically nonlinear analysis of two-dimensional frames Danilo B. Cavalcanti Rafael L. Rangel Luiz F. Martha structural analysis frame structures geometric nonlinearity tangent stiffness matrix equilibrium path This work presents an investigation, through numerical experiments, of different geometricallynonlinear formulations and solution algorithms for the structural analysis of two-dimensional frame models. Thegoal is to determine the most suitable formulation and algorithm to be adopted for structural analyses of this type.The formulations investigated for the tangent stiffness matrix of beam-column elements are based on differentkinematic descriptions of motion, namely the Updated Lagrangian and Corotational approaches. The algorithmsto solve the nonlinear system of equations are continuation methods based on the standard Newton-Raphsoniteration strategy commonly used to suppress limit points of load and displacement. The numerical experimentscover a wide variety of simple benchmark models, each one with a distinct nonlinear behavior, to evaluate theperformance of the formulations and algorithms selected for this study. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5265 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5265/4333

oai:publicacoes.softaliza.com.br:article/5266 2024-05-29T12:46:47Z cilamce2022:ART

FTOOL: Three decades of success as an educational program for structural analysis Luiz F. Martha Rafael L. Rangel structural analysis frame structures educational software interactive graphics analysis This article describes the history of the development of the educational program FTOOL, which is auser-friendly software used all over the world for teaching structural analysis of two-dimensional frames as wellas for engineering projects. The paper highlights the main milestones in the evolution of the program since itscreation in 1992. It reports how the main features of the program were progressively incorporated, through thecontribution of several academic works, until reaching the current state. The focus is given to the experience ofusing FTOOL as a powerful educational tool in many structures’ disciplines of a Civil Engineering undergraduatecourse. It also presents the program's latest improvements and the new features that are coming in the next versions.These new implementations include buckling modes for stability analysis, vibration modes, geometricallynonlinear analysis, semi-rigid connections with linear and non-linear behavior, and reinforced concrete design.With these developments, the program will remain up-to-date with the engineering demands of nowadays. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5266 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5266/4334

oai:publicacoes.softaliza.com.br:article/5267 2024-05-29T12:46:46Z cilamce2022:ART

GES: INTELLIGENT SYSTEM FOR DETECTION AND CLASSIFICATION OF DEFECTS IN GRANITE PLATES Alexsander A. Novaes Gustavo M. de Almeida Rafael P. D. Vivacqua Daniel C. Cavalieri ornamental rocks granite yolov5 deep learning According to information from BANDES (Development Bank of Espírito Santo) in 2021,Espírito Santo was responsible for 82% of brazil's marble and granite exports. This is one of the mostrelevant industries of the Economy of Espírito Santo, representing about 7% of its GDP (Gross DomesticProduct). As a comparison, in November 2021 alone, Brazil exported 221,800 tons of ornamental rocks for$138.1 million, accumulating 2.21 million tons of exported rocks in the year, totaling $1.2 billion in theperiod. Using the process of processing granite sheets, there are many manual activities, such as inspection,cataloging, photography, and registration. Such volume of interactions makes the process slow, and proneto errors that can influence the last price of the product. The applicability of artificial intelligence techniquesin these processes is observable, and it is possible to present results from the use of high-resolution digitalimages, initially fitting the classification and organization of images in a dataset applicable to machinelearning techniques. The present work aims to build a classification system of these granite plates, called"GES System", trained from the dataset with images provided by the companies participating in the projectand that will be able to identify the rock class, and its defects. The classification process will be done usingYoloV5 artificial intelligence tools. The uses of other languages for the complete completion of the projectand release for the use of the system in a production environment are planned for other stages. Among thebenefits of process automation are cost reduction, agility in the process of identifying defects andstandardization of classification. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5267 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5267/4335

oai:publicacoes.softaliza.com.br:article/5268 2024-05-29T12:46:46Z cilamce2022:ART

A MULTI-FIDELITY REDUCED-ORDER MODEL APPLIED TO RESER- VOIR ENGINEERING Matheus S. Gonçalves Yuri N. Saraiva Mathieu Ducros Multi-fidelity modeling reservoir engineering surrogate models Although the rapid evolution of computational power, some applications (e.g., optimization, uncertaintypropagation), combined with the increase of simulation complexity, may still require computational times that areunsuitable for practical purposes. Therefore, in the present work, a multi-fidelity surrogate strategy for expensivereservoir engineering numerical models is presented. The main idea of the approach is to combine informationfrom few high-fidelity samples (of long computational duration) and accurate simulations with faster evaluationsfrom a low-fidelity model with lower accuracy. This strategy provides enough information for creating a surrogate model, however with a lower computational cost than what would be obtained by evaluating just high-fidelity sam-ples (for the same level of quality). Furthermore, conversely to the majority of multi-fidelity models, the present strategy includes a dimensionality reduction technique to deal with multi-dimensional outputs. The presented ap-proach is employed in an example of a reservoir engineering problem for predicting both the net present value and the saturation of oil in the reservoir. The results obtained are suitable when evaluating both time and accuracy,indicating that the presented approach is promising for practical applications. Moreover, it also suggests that thesame framework may be used in other computationally demanding applications. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5268 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5268/4336

oai:publicacoes.softaliza.com.br:article/5269 2024-05-29T12:46:45Z cilamce2022:ART

Modelising the grain mass aeration process using the Thorpe Model with the Finite Volume Method Jotair E. Kwiatkowski Jr. Luciano K. Araki Marcio A. V. Pinto Daniel Rigoni Discretization Error Effective Order UDS Aeration Model By the technological advancements in agriculture, rural production is searching for ways to improvegrain storage. Rigorous control of temperature and moisture is essential as they are the main factors contributingto product deterioration and plague proliferation. One of the most effective ways of achieving this is by aeration, aprocess widely applied to maintaining grain quality in silos and warehouses. This work aimed to develop a controlsystem for the aeration of stored grains based on experimental data from literature and process simulations. Thecontrol strategy employed in the aeration aims to maintain temperatures uniform inside the silo and cool down thegrain mass whenever possible. During this process, the grain mass is split into multiple thin layers according tothe flow of air (upwards). The mathematical model used was proposed by Thorpe and associates psychometricproperties of the air with mass and energy balance equations. In this sense, the system of equations resultingfrom the mass and energy balances was solved iteratively for each time increment and each layer. Additionally,the model equations were discretized using the Finite Volume Method combined with the Upwind DifferencingScheme for the spatial approximations as well as explicit, implicit, and Crank-Nicolson temporal formulations.Moreover, a posteriori analysis of the discretization error orders was carried out. The proposed model in this studyhas proved satisfactory, with some variations depending on the combination between the method and the spatialand temporal approximations employed. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5269 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5269/4337

oai:publicacoes.softaliza.com.br:article/5270 2024-05-29T12:46:44Z cilamce2022:ART

Numerical simulation of bulging and their effects on ultimate bearing capacity in bored piles Michael Vicente Marko López Jorge Zegarra bored piles ultimate bearing capacity ultimate shaft resistance Piles are deep foundations that are used to overcoming difficulties of founding on soft soils to ensurestructural safety to carry the loads imposed by a structure through a weak soil to a resistant stratum. It is becomingmore important to design piles and avoid their shortcomings. Bulging in bored piles is a common event that canoccur due to multiple factors. This type of imperfection increases the ultimate bearing capacity of the pile, due tothe increase in its geometry, which increases its ultimate shaft resistance. This can be beneficial for thesuperstructure that said pile supports. However, said increase in the ultimate bearing capacity of the pile must beanalyzed cautiously, to avoid overestimations when conducting the structural design of the superstructure. For thisreason, a simulation of the ultimate bearing capacity in a concrete pile without a bulging was conducted, in orderto compare the results with different cases of piles with bulging, and to calibrate the model. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5270 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5270/4338

oai:publicacoes.softaliza.com.br:article/5271 2024-05-29T12:46:43Z cilamce2022:ART

BEAM TRANSVERSAL AREA DIMENSIONS OPTIMIZATION USING ARTIFICIAL NEURAL NETWORKS FERRO, Marco Aurelio Chaves PERLINGEIRO, Mayra Soares Pereira Lima CUNHA, Laís Brilhante da Artificial Neural Networks Structural Engineering Python Language The present work shows the analysis of a numerical experimental test that was performed usingrandomized and combined data to study the bending behavior of beams, through the deflection equationconsidering plane stresses in two different examples. The first is a cantilever beam with force concentrated at thefree end and the second is a pinned-pinned beam with loading uniformly distributed along the span. The variableswidth, height, length, longitudinal modulus of elasticity, deflection, and loading were used as estimated parametersto calculate the ideal width and height dimensions for each beam and obtain a structural optimization consideringthe limits of deformation according to ABNT NBR 6118/2014. The data generation was generated in Excelspreadsheet format and worked in an Artificial Neural Networks in TensorFlow Python language, with six hiddenlayers. In addition, the functions 'mae', 'sgd' and 'loss' were used as optimizers or activation function in TensorFlow. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5271 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5271/4339

oai:publicacoes.softaliza.com.br:article/5273 2024-05-29T12:46:42Z cilamce2022:ART

Experimental and numerical study of heat generation by energy dissipation in a rotating drum filled with particulate material Rafael L. Rangel Francisco Kisuka Chuan-Yu Wu Catherine O’Sullivan Alessandro Franci Eugenio Oñate particulate flow heat generation rotating drum infrared thermography discrete element method This work aims to investigate the generation of heat by dissipation of mechanical energy in particulateflows. The behavior of material in a rotating drum is considered in experimental and numerical analyses. In thephysical experiments, the temperature of the particles inside the drum was monitored by means of infraredthermography and the influence of rotation speed and filling ratio was explored. The experimental data were laterused to calibrate numerical simulations using the Discrete Element Method (DEM). The numerical results werethen analyzed to gain more insights into the mechanisms of heat generation. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5273 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5273/4340

oai:publicacoes.softaliza.com.br:article/5274 2024-05-29T12:46:42Z cilamce2022:ART

Deep learning algorithm based on YOLOV5 Neural Network for dermatoscospic classification and detection of epithelial cancer (MELANOMA) Thiago V. Lecchi Gustavo M. de Almeida Rafael P. D. Vivacqua deeplearning melanoma Yolov5 dermoscopy Technical concepts are introduced about epithelial cancer or melanoma, one of the most common andaggressive types of existing cancers, and about the use of applications or tools based on Artificial Intelligencetechniques and the influence of the application of machine learning to perform pre-diagnoses in medicine ingeneral, which accelerate the time of discovery of the disease and exponentially increase the chances of cure ofthe affected patient. The technical details of the algorithm based on Deep Learning Yolov5 are developed. Thepossibility of applying this tool for various purposes is discussed. The dataset used in this research is analyzed andthe possibilities of characterizing tumors between benign and malignant are verified, as well as the types ofepithelial formations found are classified. The possibility of using these classifications as input for algorithmsbased on deep learning by scanning images is discussed. It is concluded that it is possible to create logical filtersthat use the readings of the output data provided by the execution of the Yolov5 algorithm on a photographic basisof dermoscopic exams, obtaining relevantly high levels of accuracy that would point out with great precision thepossible existence of cancerous formations, thus facilitating the pre-diagnosis and early combat of skin cancer,considerably increasing the survival of patients. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5274 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5274/4341

oai:publicacoes.softaliza.com.br:article/5275 2024-05-29T12:46:41Z cilamce2022:ART

Detection and classification of firearms applied to entertainment media Junior G. Santos Gustavo M. de Almeida Flávio G. Pereira firearm yolov5 entertainment game violence Entertainment media have evolved considerably over the years. With this, the immersion and reality inthe production of films, series and electronic games has increased. By improving this virtual reality, there are sideeffects in the production of content aimed exclusively at the younger audience, which, depending on the content,usually has an excessive load of violence, especially content related to firearms. Although the state of the artalready has a significant advance in object detection through deep learning algorithms, real-time weapons detectionis still a challenge. The detection of two classes of firearms was introduced to this work: handgun and heavygun.A dataset containing 2,000 images was used and another 2,000 were collected from various entertainment mediaand later annotated. The YoloV5 algorithm was used in this research, since it is already a consolidated modelamong researchers in the area. The analysis of the result is based on the exposure time in which firearms wereexposed in entertainment content. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5275 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5275/4342

oai:publicacoes.softaliza.com.br:article/5276 2024-05-29T12:46:40Z cilamce2022:ART

ANALYSIS OF AEROELASTIC STABILITY OF VISCOELASTIC SANDWICH PANELS IN SUBSONIC REGIME USING THE NONPLANAR DOUBLET-LATTICE METHOD B.S.C. da Cunha A.M.G de Lima D.M. Borges Flutter suppression viscoelastic materials unsteady aerodynamic doublet lattice method Introduction The engineers of aeronautical industries are frequently facing with subsonic panel flutter phenomena,where the design and analyses of aerospace vehicles requires the knowledge of their critical flutter speeds forsafety requirements and to avoid catastrophes. Thus, whenever possible it is important to evaluate efficient andlow-cost aeroelastic control strategies to deal with the problem of panel flutter phenomenon. In this context, theuse of passive constraining viscoelastic layers seems to be an interesting alternative to be used in such situations.However, the structural and aerodynamic modeling procedures of an aeroviscoelastic system subjected to asubsonic airflow are not easy. In most of the cases, the difficult is related to the fact that, the viscoelastic behaviordepends strongly on the excitation frequency and temperature, resulting in some difficulties during the couplingbetween the structural and aerodynamic models to account for the unsteady aerodynamics and complex behaviorof the viscoelastic part, simultaneously. In this study, it is proposed an efficient numerical strategy to modelaeroviscoelastic systems under subsonic airflows for panel flutter suppression. Here, the curved plate model of athin three-layer sandwich panel and aerodynamic loadings using the nonplanar doublet lattice method areconstructed both in MATLAB® environment code. Also, to solve the resulting equations of motion of the complexaeroviscoelastic system, an improved version of the p-k method is proposed herein to estimate the critical flutterspeeds and to verify the possibility of increasing the critical flutter speeds of the base panel by using viscoelasticmaterials. The influence of design parameters characterizing the performance of the viscoelastic treatment and itsoperation temperature on the flutter boundary has been also addressed herein. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5276 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5276/4343

oai:publicacoes.softaliza.com.br:article/5277 2024-05-29T12:46:40Z cilamce2022:ART

Theoretical and finite element analysis of a laminated composite pipe under combined axisymmetric loading Inês Sterphanne G. Freitas Waldy T. Zuniga José Renato M. de Sousa Thermoplastic composite pipe finite element model analytical model failure criteria An essential aspect of hydrocarbon exploitation in offshore fields is ensuring the integrity of theemployed flexible pipes. In deep and ultradeep waters, new materials, structural configurations, and numericaland experimental methodologies are required to obtain viable solutions depending on the operational andenvironmental conditions. For instance, flexible pipes typically employ steel armors to resist the imposedmechanical loads. However, the dimensions of these armors significantly increase with increasing water depths,frequently causing the overload of the top supporting structures in floating production systems. Moreover, thesearmors are particularly sensitive to stress corrosion cracking (SCC) when transporting fluids rich incontaminants. Aiming to overcome these difficulties, a viable alternative to the typical flexible pipes is thethermoplastic composite pipe (TCP), which is lighter and insensitive to SCC. Hence, this work investigates theresponse of a composite pipe to combined axisymmetric loadings with two models: an analytical model based onequilibrium and compatibility equations; and a finite element (FE) model. The responses obtained with bothmodels are compared in a parametric study, where the lay-up of the pipes and the operating temperatures arevaried. Finally, the burst pressures of these pipes are predicted following different failure criteria. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5277 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5277/4344

oai:publicacoes.softaliza.com.br:article/5278 2024-05-29T12:46:39Z cilamce2022:ART

Sensitivity analysis of dry friction damper position in stay cables Thiago C. Martins Lauren K. S. Gonçalves Gregório S. Vieira finite element method stay cables dynamic analysis dry friction damper The aim of this study is to perform a comparative analysis regarding position influence of a damperwith the dry friction mechanism to control the cable vibrations in cable-stayed bridges. The finite element methodis used to implement the cable model and its validation by analytical theory. Lumped mass matrix and stiffnessmatrix considering the applied stress were generated considering the cable discretization in one hundred elements.The proportional damping matrix is obtained by the Rayleigh method with a damping rate of 0.13%. Damping rateevaluation take into account the damper position varying unitarily in the first 10% of the cable total length. Theexcitation force simulates the cable shape in its first mode of the vibration. To numerically solve the second-ordernonlinear ordinary differential equation, Newmark’s method with average acceleration is used. The dampingfactors obtained made it possible to compare with other studies for viscous dampers. Time domain was used toanalysis the amplitude variation in the middle of the cable and at damper position, where it was possible to assessmobility limitations and the feasibility of choosing the position. It can be concluded that changing the damperposition towards the cable center caused a total damping increase. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5278 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5278/4345

oai:publicacoes.softaliza.com.br:article/5279 2024-05-29T12:46:39Z cilamce2022:ART

Panel Flutter Investigation including Thermal Effects through the FEM Victor Santos Hélio de Assis Pegado panel flutter flutter aerothermoelasticity aeroelasticity Thermal effects in aeroelastic stability are of the main concern of super and hypersonic vehicles, sincethe aerodynamic heating causes, with the rise of temperature, the degradation of elastic properties of the materialand, in addition, compressive stresses due to thermal expansion, which can make flutter more critical. In recentdecades authors have developed non-linear methods in order to verify this behaviour. This paper aims to verify ifthe use of the FEM in a two steps analysis employing the Nastran software with a non-linear heat transfer analysisand subsequent eigenvalue flutter analysis can produce results agreeable with the literature. It is used in the linearthird-order Piston Theory with Van Dyke’s correction for aerodynamic modelling and the Mindlin-Reissner platetheory for structural modelling. The PK method is used to solve the aeroelastic eigenvalue problem in a range of flow conditions in order to determine the instability boundary. The results are obtained from a metallic simple-supported square panel. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5279 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5279/4346

oai:publicacoes.softaliza.com.br:article/5280 2024-05-29T12:46:38Z cilamce2022:ART

TWO-DIMENSIONAL ELASTIC LINEAR PROBLEMS USING THE VIR- TUAL ELEMENT METHOD Paulo Akira Figuti Enabe Rodrigo Provasi Virtual Element Method Linear Elasticity Finite Element Method Virtual Element Method (VEM) is a relatively new method for solving partial differential equations,which proposes to generalize the classical Finite Element Method (FEM) with respect to the mesh discretization.In the two-dimensional case, any simple polygon can be used as discretization element and, as a result, the shapefunction are not strictly polynomials. The method main characteristic is to compute those functions implicitly,without the necessity of knowing their explicit form, giving it great versatility when treating complex geometries.The VEM presents a dense mathematical formulation, and it was originally developed for the Poisson equation. Inrecent years, a considerable number of works has applied the method for different engineering problems usuallytreated using finite element models. For example, VEM formulations were adapted to different rheology problems,contact problems and topological optimization. However, the usage of the Virtual Element Method is not so popularwhen compared to the Finite Element Method or the Extended Finite Element Method. The main goal of this paperis to present the Virtual Element Method applied to linear elasticity problems in two-dimensions by focusing onits implementation, aiming to contribute for the popularization of the method. The results obtained with VEM arecompared with the results from a Finite Element Method commercial software, showing good agreement and thegreat potential of the method in engineering problems. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5280 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5280/4347

oai:publicacoes.softaliza.com.br:article/5281 2024-05-29T12:46:38Z cilamce2022:ART

Measurement of classified points using stereo vision and techniques of segmentation in disparity map for detection of obstacles. L. Pin R. Vivacqua M. Cuadros self-driving car disparity map obstacle a voidance This work presents an obstacle detection system using a stereo camera as a sensor and segmentationtechniques in occupancy maps identifying navigable and non-navigable regions. The disparity images are used tobuild a 3D point cloud whose distances are calculated from the ground plane. Then, points that are in a range ofdistances are classified as potential obstacles and recorded on an occupancy map. Clustering techniques are thenapplied to identify obstacles to identify the position, size and speed of obstacles. To validate the algorithmdeveloped in this work, some real tests were carried out with a full-scale autonomous vehicle. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5281 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5281/4348

oai:publicacoes.softaliza.com.br:article/5282 2024-05-29T12:46:37Z cilamce2022:ART

COMPARATIVE ANALYSIS BETWEEN TURBULENCE MODELS FOR THE RECTANGULAR 2:1 CROSS SECTION Juliema Fronczak Alexandre Miguel Silva Araujo Gabriel Antonio Mendes das Flores Alexandre A. Cury Patricia Habib Hallak CFD OpenFoam Rectangular Section Aeroelasticity Flow around rectangular structures is a classic topic in computer simulation due to its incidence andcharacteristic similar to structures in engineering such as tall buildings, bridge decks, water treatment plants,etc. Therefore, this work discusses the results of two-dimensional computational fluid dynamics simulations ofturbulent flow, performed for a rectangular cylinder with Re=105 . The Navier-Stokes equations were solved withReynolds mean turbulence models, specifically, k-ω SST, k-ω SST LM, k-ε. The simulations performed areused as a parameter for a comparative analysis of the performance of these turbulence models. The objective ofthe research is to carry out a discussion about the presented turbulence models, making a correlation with thecoefficients of drag, lift, Strouhal number and the pressure coefficient around the studied section. The analysisshowed that for the case studies considered, the k ω SST and k ω SST LM models were able to provide resultscloser to the literature when compared to the others. All developments were performed with non-commercialOpenFoam code. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5282 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5282/4349

oai:publicacoes.softaliza.com.br:article/5283 2024-05-29T12:46:36Z cilamce2022:ART

COMPARISON OF DIVERGENCE SCHEMES APPLIED TO THE STATIC CASE OF THE GREAT BELT EAST BRIDGE Alexandre Miguel Silva Araújo Juliema Fronczak Gabriel Antonio Mendes das Flores Alexandre Abrahão Cury Patricia Habib Hallak Bridges Divergence Schemes Turbulence Computacional Fluid Dynamics The behavior of slender structures to the action of the wind is the object of study in numerous works.With the constant evolution of Computational Fluid Dynamics (CFD), obtaining and analyzing results throughnumerical methods has been increasingly used by researchers in order to provide reliable parameters for newengineering projects. In this study, simulations are presented with a 2D approach of the static case of the GreatBelt East Bridge in turbulent flow with Re 105 , applying the k-ω SST turbulence model to the simulation withthe Reynolds Averaged Navier-Stokes methodology (RANS), which deals with an averaging operation appliedto the Navier-Stokes equations to obtain the average fluid flow equations. The simulations were performed viaOpenFOAM®, using four divergence schemes: Gauss QUICK, Gauss upwind, Gauss linearUpwind, and GausslimitedLinear. Then, a comparison was made of the average values of the dimensionless aerodynamic coefficientsof drag (Cd), lift (Cl) and moment (Cm), in addition to the Strouhal number (St). There was also an evaluationof the computational performance of the schemes applied in the simulations. In conclusion, the QUICK schemepresented promising results in all analyses, and the others were within an acceptable range, with some values closeto those found in the literature. Finally, the results obtained via CFD were validated and considered satisfactory,proving the effectiveness of this methodology. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5283 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5283/4350

oai:publicacoes.softaliza.com.br:article/5284 2024-05-29T12:46:36Z cilamce2022:ART

Aerodynamic and aeroelastic analysis of the NACA0012 airfoil using CFD Gabriel Antonio Mendes das Flores Patrícia Habbib Hallak Alexandre Miguel Silva Araujo Juliema Fronczak Alexandre Abrahao Cury CFD NACA0012 k-omegaSST divergence speed The aerodynamic analysis represents the beginning of the conceptual planning of an aeronautical project.These analysis result in the establishment of important parameters, such as the maximum weight that the aircraftis allowed to have, as well as the aerodynamic coefficients, which define geometric and flight aspects. There areseveral ways of evaluating the aerodynamic coefficients of a wing, such as, for example, the use of wind tunnels(database in the laboratory), traditional analytical methods, or even computer modeling, which can be based onthe method of panels, or finite volume method (FVM). In order to develop this work, FVM and the open sourcecode called OpenFOAM (in C++ programming language) are used. The aim of this experiment is to analyze theactivity of the aerodynamic coefficients with the increase of the angle of attack (AoA) of the airfoil NACA 0012,through a two-dimensional model, and apply these data to evaluate the aeroelastic phenomenon of divergence of aconceptual wing. The aerodynamic coefficients of lift and drag were evaluated for a Reynolds number 700000, bythe consideration of a turbulence model of the RANS class of the Reynolds averages called k-omegaSST. For thecomputational solution, the implementation of pressure-velocity coupling was used, through the SIMPLE method.The angle of attack started from 0 degrees to the limit region for the start of the stall. The results were consistentwith those established as a reference, which was obtained for data validation of the NACA 0012 airfoil. Therate of variation of the lift coefficient, as a function of the angle of attack of the airfoil, allows the evolution ofthe aerodynamic loading in the structure, an essential factor for the aeroelastic study of a project. The examplediscussed in this work does not fail structurally, and presents a divergence velocity value above the limit for theflight envelope. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5284 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5284/4351

oai:publicacoes.softaliza.com.br:article/5285 2024-05-29T12:46:35Z cilamce2022:ART

Acoustic cavity theoretical and numerical analyses for noise attenuation by applying Helmholtz resonators D. Fernandes M. Barcelos M. Henrique Noise control acoustic cavity Helmholtz resonator transmission loss From the passive methods of acoustic cavity sound control, the use of reactive silencers is widely ap-plied in many engineering sectors. These devices consist of segments of interconnected cavities that do not use materials with dissipative properties. There is a variety of reactive silencers and the present work has highlightedthe Helmholtz resonator. Methodologies for the evaluation of acoustic cavities using these resonators for soundcontrol purposes are not extensive, so a theoretical method for the analysis of noise attenuation performance in thisacoustic system is presented. In addition, in order to evaluate and discuss the theoretical results obtained, analysiswas performed using the finite element method with the aid of ANSYS® software with acoustic extension. In this methodology, the pressure-formulated element has been used. The theoretical and numerical results demon-strated good agreement and evidenced the sensitivity of the acoustic parameters and sound control efficiency to the resonator neck geometry which exerted a strong influence on the modal parameters and on the transmission loss in theoretical results. Lastly, an experimental study of acoustic cavity sound control using Helmholtz res-onators developed at the University of Brasilia is evaluated by the methodology presented, in order to obtain a numerical-experimental comparison of the results obtain. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5285 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5285/4352

oai:publicacoes.softaliza.com.br:article/5287 2024-05-29T12:46:35Z cilamce2022:ART

Multi-level optimization of maintenance planning for corroded pipelines considering different corrosion growth models Savanna C.M. D’Aguiar Álamo D.S. Pessoa Paulo F.S. Sousa Silvana M.B.A. da Silva Ramiro B. Wilmersdorf corroded pipelines maintenance planning multi-level optimization Pipelines are safe and efficient elements used to transport oil & gas products, but over time theirstructural integrity can be compromised due to corrosion defects. In order to ensure the safety and efficiency of apipeline, risk management through periodic inspections (and repairs when needed) is essential. In this work, theinfluence of different corrosion growth models - namely linear and power-law - on the estimated total costs (thesum of cost of inspections, failures and repairs) of inspection schedules is assessed; these schedules are, then,optimized for a given number of inspections, constrained to a predefined reliability threshold. Our findings reaffirm those of previous studies that show the linear model as being more conservative than the non-linear power-law one providing larger optimized total estimated costs. XLIII Ibero-Latin American Congress on Computational Methods in Engineering 2024-05-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2022/article/view/5287 XLIII Ibero-Latin American Congress on Computational Methods in Engineering; v. 4 n. 04 (2022): CILAMCE 2022 por https://publicacoes.softaliza.com.br/cilamce2022/article/view/5287/4353 5bcac559312c0f648c017e3bddf2fb45