Accurate Model and Verification of Suspended Vibration Energy Harvester Based on Complex Permanent Magnet Array

doi:10.3901/JME.2022.20.128

Abstract

Abstract: In order to improve the output performance and operating frequency bandwidth of vibration energy harvesters, the devices based on permanent magnet arrays and multi-degree-of-freedom devices have received extensive attention. However, the complex magnetic field distribution and difficult to simulate dynamic characteristics are problems of such devices. For a tuneable resonance frequency magnetic levitation vibration energy harvester based on complex permanent magnet array, a joint analysis model of the device’s analytical model and finite element model is established. The system’s nonlinear vibration characteristics is shown by theoretical model, and its dynamic model can be simplified to Duffing’s equation. The analysis of nonlinear systems can also be simplified by the Finite Element Method model. The magnetic field distribution and nonlinear magnetic characteristics of the device are studied by using COMSOL finite element simulation, and the influence of magnetic force and coil position on the output characteristics of the device is analyzed. A test platform is built to perform experimental characterization of the developed tuneable resonance frequency magnetic levitation vibration energy harvester to verify the joint analysis model. The results show that the resonance frequency of the device varies from 8.6 Hz to 13.1 Hz within the range of distance between two fixed magnets from 20 mm to 35 mm. Under the acceleration of 0.35g, the peak-to-peak output voltage ranges from 352.9 mV to 658.2 mV. It is consistent between the joint analysis model and the experiment.

Key words: magnetic levitation, energy harvester, nonlinear systems, frequency tuning

CLC Number:

WANG Xinyi, WANG Junyuan, ZHANG Yilin, CHEN Xiaoming, TAO Kai, LI Yunjia. Accurate Model and Verification of Suspended Vibration Energy Harvester Based on Complex Permanent Magnet Array[J]. Journal of Mechanical Engineering, 2022, 58(20): 128-136.

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URL: http://www.cjmenet.com.cn/EN/10.3901/JME.2022.20.128

http://www.cjmenet.com.cn/EN/Y2022/V58/I20/128

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