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Shock and Vibration
Volume 2016, Article ID 8640139, 14 pages
http://dx.doi.org/10.1155/2016/8640139
Research Article

Experiments and Electromechanical Properties of a Broadband Piezoelectric Vibration Energy Harvester

School of Information and Electronic Engineering, Zhejiang Gongshang University, No. 18, Xuezheng Street, Xiasha University Town, Hangzhou 310018, China

Received 11 March 2015; Revised 12 October 2015; Accepted 13 October 2015

Academic Editor: Nerio Tullini

Copyright © 2016 Guangqing Wang 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

A broadband piezoelectric energy harvester (BPEH), consisting of a conventional linear piezoelectric energy harvester (CPEH) and an elastic magnifier, was presented in this paper. The improved two-degree-of-freedom lumped-parameter electromechanical model of the BPEH was established and the optimal external resistances under short-circuit and open-circuit resonance conditions were investigated to maximize the output power of the BPEH. The output voltage and output power of the BPEH obtained from the theoretical model were verified and found to be in reasonable agreement with the experimental results. The obtained results have shown that the maximal output powers under short-circuit and open-circuit resonance conditions are both 24 times that generated by the CPEH without elastic magnifier. The frequency space between the two peaks of the frequency-response curve of the BPEH is 14 Hz which is 7 times that of CPEH.