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research-article

Two methods to broaden bandwidth of a nonlinear piezoelectric bimorph power harvester

[+] Author and Article Information
Hongping Hu

Department of Mechanics, Huazhong University of Science and Technology, Wuhan 430074, ChinaHubei Key Laboratory of Engineering Structural Analysis and Safety Assessment, Huazhong University of Science and Technology, Wuhan 430074, ChinaFranche-Comté Electronique Mécanique Thermique et Optique, CNRS UMR 6174, Université de Bourgogne Franche-Comté, Besançon 25030, France
huhp@hust.edu.cn

Longxiang Dai

Department of Mechanics, Huazhong University of Science and Technology, Wuhan 430074, ChinaHubei Key Laboratory of Engineering Structural Analysis and Safety Assessment, Huazhong University of Science and Technology, Wuhan 430074, China
dhh@hust.edu.cn

Hao Chen

Department of Mechanics, Huazhong University of Science and Technology, Wuhan 430074, ChinaHubei Key Laboratory of Engineering Structural Analysis and Safety Assessment, Huazhong University of Science and Technology, Wuhan 430074, China
chenhaomail@hust.edu.cn

Shan Jiang

Department of Mechanics, Huazhong University of Science and Technology, Wuhan 430074, ChinaHubei Key Laboratory of Engineering Structural Analysis and Safety Assessment, Huazhong University of Science and Technology, Wuhan 430074, ChinaFranche-Comté Electronique Mécanique Thermique et Optique, CNRS UMR 6174, Université de Bourgogne Franche-Comté, Besançon 25030, France
lovenix@hust.edu.cn

Hairen Wang

Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China
hairenwang@pmo.ac.cn

Vincent Laude

Franche-Comté Electronique Mécanique Thermique et Optique, CNRS UMR 6174, Université de Bourgogne Franche-Comté, Besançon 25030, France
vincent.laude@femto-st.fr

1Corresponding author.

ASME doi:10.1115/1.4035717 History: Received June 17, 2016; Revised January 06, 2017

Abstract

We propose two methods to broaden the operation bandwidth of a nonlinear pinned-pinned piezoelectric bimorph power harvester. The energy-scavenging structure consists of a properly poled and electroded flexible bimorph with a metallic layer in the middle, and is subjected to flexural vibration. Nonlinear effects at large deformations near resonance are considered by taking the in-plane extension of the bimorph into account. The resulting output powers are multi-valued and exhibit jump phenomena. Two methods to broaden the operation bandwidth are proposed: The first method is to extend the operation frequency to the left single-valued region through optimal design. The second method is to excite optimal initial conditions with a voltage source. Larger output powers in the multi-valued region of the nonlinear harvester are obtained. Hence the operation bandwidth is broadened from the left single-valued region to the whole multi-valued region.

Copyright (c) 2017 by ASME
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