Modeling and output performance analysis of maglev vibration energy harvester system based on magnetic liquid

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (1) : 218-229.

ZHANG Xianwen, LI Guozheng, WANG Weijie, SU Shuqiang

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Abstract

Aiming at the problems of low output power and small working frequency range of existing vibration energy harvesters, a new structure of nonlinear maglev vibration energy harvester based on magnetic liquid was proposed. Firstly, the structure of the new energy harvester is proposed, its working principle is analyzed, and the nonlinear mechanical model of magnetic dipole is established. The simulation results are compared with the experimental data to verify its accuracy. Then, the second-order buoyancy and viscous damping of the magnetic liquid were analyzed, and its mathematical model was established. The approximate solution of the dynamic equation of the energy regenerator was solved by multi-scale transformation method, and the output performance response model was obtained. Finally, the influence of three kinds of system structure parameters and excitation acceleration on the output performance of energy harvester is analyzed and the output performance of energy harvester with or without magnetic liquid is compared. The results show that the distance between magnets, the total mass of the suspension magnet and the magnetic liquid and the excitation acceleration can effectively change the working frequency range and the output power amplitude of the energy harvesting device, and the damping ratio mainly affects the output power amplitude. The output voltage peak value and output power peak value of the new energy harvester respectively reach 426.88mV and 0.56mW. The output voltage and power respectively increase by 22.67% and 75% after adding magnetic liquid. Compared with other low-frequency vibration energy harvesters, it has better output power characteristics. The structure and dynamic model of the new maglev energy harvester can provide a new solution for broadening the range of the working frequency band and enhancing the output power performance of this kind of energy harvester, which has good reference value.

Key words

vibrational energy capture / nonlinearity / magnetic liquid / multiscale transformation method / power generation performance

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ZHANG Xianwen, LI Guozheng, WANG Weijie, SU Shuqiang. Modeling and output performance analysis of maglev vibration energy harvester system based on magnetic liquid[J]. Journal of Vibration and Shock, 2024, 43(1): 218-229

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