Experimental study on broadband bistable energy harvester with L-shaped piezoelectric cantilever beam
作者机构：School of Artificial IntelligenceTiangong UniversityTianjin 300387China School of Mechanical EngineeringTiangong UniversityTianjin Key Laboratory of Modern Mechatronics Equipment TechnologyTianjin 300387China College of Mechanical EngineeringBeijing University of TechnologyBeijing Key Laboratory of Nonlinear Vibrations and Strength of Mechanical StructuresBeijing 100124China
出 版 物：《Acta Mechanica Sinica》 (力学学报（英文版）)
年 卷 期：2020年第36卷第3期
页 面：557-577页
核心收录：
学科分类：08[工学] 0807[工学-动力工程及工程热物理] 0802[工学-机械工程] 0701[理学-数学] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学]
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).
主 题：Bistable piezoelectric energy harvester Inverted L-shaped beam Power generation Effective frequency bandwidth Nonlinear dynamics
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.
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