Experimental study on broadband bistable energy harvester with L-shaped piezoelectric cantilever beam  

作　　者：Minghui Yao Pengfei Liu Li Ma Hongbo Wang Wei Zhang 

机构地区：[1]School of Artificial Intelligence,Tiangong University,Tianjin 300387,China [2]School of Mechanical Engineering,Tiangong University,Tianjin Key Laboratory of Modern Mechatronics Equipment Technology,Tianjin 300387,China [3]College of Mechanical Engineering,Beijing University of Technology,Beijing Key Laboratory of Nonlinear Vibrations and Strength of Mechanical Structures,Beijing 100124,China

出　　处：《Acta Mechanica Sinica》2020年第3期557-577,共21页力学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grants 11772008,11172009,11372015,11232009,10872010,11290152,10732020);the Tianjin Natural Science Foundation(Grant 19JCZDJC32300).

摘　　要：This paper presents an experimental study of the broadband energy harvesting and dynamic responses of an L-shaped piezoelectric cantilever beam.Experimental results show that the L-shaped piezoelectric beam generates two optimal voltage peaks when the horizontal beam size is similar to the vertical beam size.Several optimized L-shaped piezoelectric cantilever beam structures are proposed.Power generation using the inverted bistable L-shaped beam is better.It is observed experimentally that the inverted bistable L-shaped beam structure shows obvious bistable characteristics and hard spring characteristics.Furthermore,the corresponding relationship between the bistable phase portrait and the potential energy curve is found in the experiment.This is the first time that a phase portrait for stiffness hardening of an L-shaped beam has been found experimentally.These results can be applied to analysis of new piezoelectric power generation structures.

关 键 词：Bistable piezoelectric energy harvester Inverted L-shaped beam Power generation Effective frequency bandwidth Nonlinear dynamics 

分 类 号：TM619[电气工程—电力系统及自动化]