Vibration Energy Harvesting Mechanism and Dynamic Characteristics of a Compound Tri-stable Piezoelectric Vibratory Energy Harvester Combining a Linear Amplifying Mechanism and Nonlinear Magnetic Force

被引：0
|
作者：
Zheng Y. [1 ,2 ]
Zhu Q. [1 ,2 ]
Zhao Z. [1 ,2 ]
Ju Y. [1 ,2 ]
Li Y. [1 ,2 ]
Liu Z. [1 ,2 ]
Zhou S. [1 ,2 ]
Wang G. [1 ,2 ]
Zhang B. [1 ,2 ]
机构：
[1] School of Information & Electronic Engineering, Zhejiang Gongshang University, Hangzhou
[2] Institute of Sussex Artificial Intelligence, Zhejiang Gongshang University, Hangzhou
来源：
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | 2022年 / 58卷 / 23期
关键词：
dynamic bifurcation; energy harvesting; linear amplifying; nonlinear magnetic force; tri-stable energy harvester;
D O I：
10.3901/JME.2022.23.138
中图分类号：
学科分类号：
摘要：
A hybrid piezoelectric device combining a tri-stable piezoelectric energy harvester (TPEH) with a linear amplifier and nonlinear magnetic force is presented to enhance the harvesting ability of the low-orbit vibration energy. The linear amplifying mechanism (LAM) composed of a mass and spring is placed between the TPEH and the base to amplify the low-orbit vibration and provide the TPEH enough kinetic energy to overcome the potential barrier, which make the TPEH easily jump to the high-orbit oscillation, resulting in an even better operating bandwidth and higher power generation. The nonlinear electromechanical model describing the dynamic responses of the presented harvester is derived. The effects of the mass ratio and stiffness ratio on the dynamic performances of the hybrid energy harvester are numerically investigated with dynamic bifurcation diagrams method. The results show that the presented harvester has wider frequency bandwidth and higher power generation by properly selecting the mass ratio and stiffness ratio, and it can more easily snap-through from low-orbit oscillation to high-orbit oscillation to reach larger dynamic response at lower excitation levels. Experiments are conducted to validate the simulations, and the experimental results are in reasonable agreement with the theoretical results. Compared to the traditional tri-stable piezoelectric energy harvester, the working frequency band of the compound TPEH enlarges from 3～14 Hz to 2～21.5 Hz, and the excitation acceleration required to jump from low-orbit vibration to high-orbit vibration decreases from 13.5 m/s2 to 5.8 m/s2. © 2022 Editorial Office of Chinese Journal of Mechanical Engineering. All rights reserved.
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页码：138 / 150
页数：12
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