Vibration Characteristics and Experimental Research of an Improved Bistable Piezoelectric Energy Harvester

Bistable piezoelectric energy harvester (BPEH) can remove mechanical waste, which is expected to realize the self-power supply of wireless sensors. To further improve harvesting efficiency, we designed an improved bistable (IBPEH). The restoring force model composing beam acquired based on fitting experimental data, and nonlinear magnetic obtained by using dipole method. electromechanical coupling dynamics system established Newton’s second law Kirchhoff’s law. Based control variable method, influences excitation frequency amplitude vibration characteristics IBPEH BPEH are compared in simulation analysis. Moreover, correctness theoretical analyses verified experiments. results show that variations number magnets appropriate adjustments their positions broaden operating bandwidth harvester, large-amplitude periodic motion at lower amplitudes. yield a higher voltage than under same conditions. This paper provides basis for optimizing potential well improving electric harvest efficiency device.