Bifurcation analysis and nonlinear dynamics of a capacitive energy harvester in the vicinity of the primary and secondary resonances

Abstract The objective of the present study is to examine effect nonlinearity on efficiency enhancement a capacitive energy harvester. model consists cantilever microbeam underneath which there an electret layer with surface voltage, responsible for driving energy. packaged device exposed unwanted harmonic mechanical excitation. undergoes vibration, and accordingly, harvested throughout output electric circuit. dynamic formulation accounts nonlinear curvature, inertia, electrostatic force. in vicinity primary super-harmonic resonances examined, power evaluated. Bifurcation analysis carried out dynamics system by detecting bifurcations frequency domain diagnosing their respective types. One challenging issues design energy-harvesting devices broaden bandwidth so that more frequencies are potentially accomodated within amplification region. In this study, broadening, as well improvement device, examined. It seen base excitation amplitude increases, vibration does also increase accordingly dominates. resonance regions emerge get bigger pull-in gaps appear response curves.