A study on the usage of magneto rheological elastomers for non-linear aeroelastic oscillations control

Resumo

Magneto Rheological Elastomers (MRE) are composite intelligent materials, which can substantially change their viscoelastic properties due to their high magneto-sensitivity in response to different regimes of external magnetic field. Under the influence of a magnetic field, both storage shear and loss factor of MREs increase, this field-induced phenomenon is often referred to as the magnetorheological effect. The practical application of MR materials demonstrates great potential for several areas, as indicates the increasing number of patents registered in the last decade. This research is included in a line aimed to develop MRE devices for structural vibrations' control, exploring the magnetorheological effect and its capacity to promote gains in viscoelastic properties, thus enabling changes of relevant magnitudes in structural systems, such as the natural frequency and damping ratio. This adaptive behavior can be studied by the analysis of qualitative numerical simulations, this study proposes to investigate the effectiveness of MRE devices on wind induced aeroelastic oscillations (galloping equation), the results are obtained by the Multiple Scale Method and numerical integrations, showing a trajectory suppression on the phase-plane of limit cycles to focal points, as well as a three-fold change in the critical speed and alterations on the shape of the Hopfs bifurcation diagram.