Broadband Energy Harvesting with Piezoelectric Material and Fixed Inductance-Resistance Circuit

Authors: Ting Tan1, Zhimiao Yan2*, Yuanyuan Liu3

1 State Key Laboratory of Mechanical System and Vibration, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

2 School of Astronautics, Harbin Institute of Technology, Harbin 150001, China

3 Institute of Water Resources and Hydro-electric Engineering, Xi’an University of Technology, Xi’an 710048, China

DOI: 10.5185/amlett.2018.2217

Publication Date (Web): Oct 26, 2018

E-mail: zhimiaoy@hit.edu.cn

Abstract

Piezoelectric energy harvesting from the ambient vibrations provides the alternative and clean power. For broadband energy harvesting, adjustable design of the inductance and resistance was reported with sensitive issues. A novel broadband design approach via the fixed inductance and resistance is proposed in this study. Electromechanical coupled distributed parameter models are developed in the framework of the Euler-Bernoulli beam theory and Gauss law for the piezoelectric energy harvesters with the parallel inductive-resistive interface circuit. Analytical solutions are obtained using the equivalent structure method and then confirmed by their numerical counterparts. The explicit algebraic expressions of the fixed inductance and resistance assuring the broadband performance are derived via frequency matching. The bandwidth after design is about 90-160 rad/s, symmetric to the modified natural frequency, with the lower bound of the harvested power of 25-5 mW and the upper bound of the tip displacement of 1.2 mm. Compared with the adjustable design, the fixed design is more convenient and durable. 

Keywords

piezoelectric energy harvesting, broadband design, fixed inductive-resistive circuit, modified natural frequency

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