A Novel Tunable Multi-Frequency Hybrid Vibration Energy Harvester Using Piezoelectric and Electromagnetic Conversion Mechanisms

Applied Sciences

Zhenlong Xu¹  Xiaobiao Shan¹  Danpeng Chen²  Tao Xie¹ 

[1] School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China;Zhejiang Guochen Robot Technology Co., Ltd., Hangzhou 311215, China;

关键词: piezoelectric and electromagnetic;    hybrid energy harvester;    magnetic interaction;    multi-frequency;    low-frequency vibration;   

DOI  :  10.3390/app6010010

来源: mdpi

【 摘 要 】

This paper presents a novel tunable multi-frequency hybrid energy harvester (HEH). It consists of a piezoelectric energy harvester (PEH) and an electromagnetic energy harvester (EMEH), which are coupled with magnetic interaction. An electromechanical coupling model was developed and numerically simulated. The effects of magnetic force, mass ratio, stiffness ratio, and mechanical damping ratios on the output power were investigated. A prototype was fabricated and characterized by experiments. The measured first peak power increases by 16.7% and 833.3% compared with that of the multi-frequency EMEH and the multi-frequency PEH, respectively. It is 2.36 times more than the combined output power of the linear PEH and linear EMEH at 22.6 Hz. The half-power bandwidth for the first peak power is also broadened. Numerical results agree well with the experimental data. It is indicated that magnetic interaction can tune the resonant frequencies. Both magnetic coupling configuration and hybrid conversion mechanism contribute to enhancing the output power and widening the operation bandwidth. The magnitude and direction of magnetic force have significant effects on the performance of the HEH. This proposed HEH is an effective approach to improve the generating performance of the micro-scale energy harvesting devices in low-frequency range.

【 授权许可】

CC BY   
© 2016 by the authors; licensee MDPI, Basel, Switzerland.