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Performance of a Piezoelectric Bimorph Harvester with Variable Width

Published online by Cambridge University Press:  05 May 2011

H. P. Hu ,
Z. J. Cui  and
J. G. Cao
H. P. Hu*
Affiliation:
Department of Mechanics & School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
Z. J. Cui*
Affiliation:
Department of Mechanics, Huazhong University of Science and Technology, Wuhan, 430074, China School of Natural Resources and Oil Engineering, Xi 'an Oil University, Xi'an, 710065, China
J. G. Cao*
Affiliation:
Department of Mechanics, Huazhong University of Science and Technology, Wuhan, 430074, China
*
*Postdoctoral Researcher
**Associate Professor
**Associate Professor
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Abstract

This article analyzes the performance of a piezoelectric energy harvester in the flexural mode for scavenging ambient vibration energy. The energy harvester consists of a piezoelectric bimorph plate with a variable width. A theoretical study is performed and the computational results show that the output power density increases initially, reaches a maximum, and then decreases monotonically with the increasing width, underscoring the importance for the width design of the scavenging structure. Further analysis indicates that the peak of output power density is determined by both the bimorph deformation amplitude and the efficiency in scavenging-energy. The analysis for this simplified model piezoelectric harvester provides a framework for further development on design guidelines for piezoelectric energy harvesters of optimal performance.

Keywords

Piezoelectric harvesterVariable cross sectionPower density.
Type
Articles
Information
Journal of Mechanics , Volume 23 , Issue 3 , September 2007 , pp. 197 - 202
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2007

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