Evaluation of Integration Methods for Time-Domain Response Analysis of Vibrations in a Full-Car Model

Resumo

Vibrations generated by road surface irregularities are intrinsically linked to the comfort level experienced by drivers and passengers in several means of transport. Consequently, the effects can range from mild discomfort to permanent trauma, depending on the vibration amplitude and exposure time. This effect is further exacerbated when traversing off-road terrain. Therefore, this study aims to determine the time-domain system responses and investigate system transmissibility in an 8-degree-of-freedom full-car vehicle model of a vehicle used in rural areas. To achieve this, a class E road surface according to ISO 8608 was generated for all four wheels using power spectral density and transformed into its corresponding time-domain representation. The system's natural frequencies and vibration modes were calculated using the vehicle's input data. Three integration methods (Newmark, Central Finite Differences, and State Space) were used to obtain the displacements and accelerations of both the vehicle body and the driver's seat, demonstrating the equivalence of the methods.