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Shock and Vibration
Volume 2018, Article ID 7082724, 15 pages
https://doi.org/10.1155/2018/7082724
Research Article

Modeling and Experiment of a V-Shaped Piezoelectric Energy Harvester

Yue Zhao,1,2 Yi Qin,1,2 Lei Guo,1,2 and Baoping Tang1,2

1State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, China
2College of Mechanical Engineering, Chongqing University, Chongqing 400044, China

Correspondence should be addressed to Yi Qin; moc.nuyila@808_yq

Received 31 July 2017; Accepted 25 September 2017; Published 27 May 2018

Academic Editor: Paul Cahill

Copyright © 2018 Yue Zhao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Vibration-based energy harvesting technology is the most promising method to solve the problems of self-powered wireless sensor nodes, but most of the vibration-based energy harvesters have a rather narrow operation bandwidth and the operation frequency band is not convenient to adjust when the ambient frequency changes. Since the ambient vibration may be broadband and changeable, a novel V-shaped vibration energy harvester based on the conventional piezoelectric bimorph cantilevered structure is proposed, which successfully improves the energy harvesting efficiency and provides a way to adjust the operation frequency band of the energy harvester conveniently. The electromechanical coupling equations are established by using Euler-Bernoulli equation and piezoelectric equation, and then the coupled circuit equation is derived based on the series connected piezoelectric cantilevers and Kirchhoff's laws. With the above equations, the output performances of V-shaped structure under different structural parameters and load resistances are simulated and discussed. Finally, by changing the angle between two piezoelectric bimorph beams and the load resistance, various comprehensive experiments are carried out to test the performance of this V-shaped energy harvester under the same excitation. The experimental results show that the V-shaped energy harvester can not only improve the frequency response characteristic and the output performance of the electrical energy, but also conveniently tune the operation bandwidth; thus it has great application potential in actual structure health monitoring under variable working condition.