Análise da capacidade de captação de energia de um sistema tipo portal U

Abstract

This dissertation presents an investigated the dynamics and influence of chaotic behavior on energy harvesting for a U-shaped structure (portal frame). For this study, Shape memory alloy (SMA), piezoelectric material (PZT), a nonlinear energy sink (NES), and a non-ideal excitation source represented by an unbalanced electric motor coupled to this structure were utilized. The applied mathematical model presented nonlinearities arising from the nonlinear stiffness of the U-shaped structure, the NES system, SMA, and PZT material. Chaotic behavior was assessed through time history, bifurcation and phase diagrams, and 0-1 tests. Energy harvesting was performed through the piezoelectric material (PZT) and electromagnetic induction in the NES coil. Dynamic observation was conducted through the analysis of parameters related to piezoelectric coupling and NES. Numerical simulations demonstrated that the system exhibits chaotic behavior for specific parameters. Thus, the significant influence of SMA, PZT and NES material parameters on the chaotic behavior and energy capture of the investigated electromechanical system was numerically shown.