Multiple-Scale Analysis of a Tunable Bi-Stable Piezoelectric Energy Harvester
Multiple-Scale Analysis of a Tunable Bi-Stable Piezoelectric Energy Harvester
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DOI：
10.1115/1.4046961
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发表时间：
2020-04
期刊：
影响因子：
--
通讯作者：
Feng Qian;N. Abaid;L. Zuo
中科院分区：
文献类型：
--
作者：
Feng Qian;N. Abaid;L. Zuo
本文提出了一种新型的压电能量采集器的理论建模和多尺度分析，包括一个金属悬臂梁，压电薄膜，和一个轴向预载弹簧在活动端。随着预加载弹簧的刚度增加，采集器经历单稳态和双稳态状态。控制方程推导了轴向运动引起的两个高阶耦合项。文献表明，这些高阶耦合项导致繁琐的计算的稳定性分析的解决方案。本文介绍了一种分析策略和多尺度方法的实施，无论是单稳态还是双稳态的收割机。数值模拟进行验证的解析解。电阻，激励水平，和弹簧预变形的电压输出和动态的影响进行了研究。弹簧预变形对单稳态系统的能量收集性能影响较小，而对双稳态系统的能量收集性能影响较大。
This paper presents the theoretical modeling and multiple-scale analysis of a novel piezoelectric energy harvester composed of a metal cantilever beam, piezoelectric films, and an axial preload spring at the moveable end. The harvester experiences mono- and bi-stable regimes as the stiffness of preload spring increases. The governing equations are derived with two high-order coupling terms induced by the axial motion. The literature shows that these high-order coupling terms lead to tedious calculations in the stability analysis of solutions. This work introduces an analytical strategy and the implementation of the multiple-scale method for the harvester in either the mono- or bi-stable status. Numerical simulations are performed to verify the analytical solutions. The influence of the electrical resistance, excitation level, and the spring pre-deformation on the voltage outputs and dynamics are investigated. The spring pre-deformation has a slight influence on the energy harvesting performance of the mono-stable system, but a large effect on that of the bi-stable system.