基于磁性液体的磁浮式振动俘能器系统建模与输出性能分析

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (1) : 218-229.

论文

张宪文，李国正，王伟杰，苏树强

作者信息 +

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

ZHANG Xianwen, LI Guozheng, WANG Weijie, SU Shuqiang

Author information +

文章历史 +

摘要

针对现有振动俘能器输出功率低、工作频带范围小等问题，提出了一种基于磁性液体的非线性磁浮式振动俘能器新型结构。首先，提出新型俘能器的结构形式，分析其工作原理，建立磁偶极子非线性力学模型，对比仿真结果与实验数据，验证其准确性；然后，分析磁性液体的二阶浮力和粘性阻尼，建立其数学模型，运用多尺度变换方法求解俘能器动力学方程的近似解，进而获得输出性能响应模型；最后，分析三类系统结构参数和激励加速度变化对俘能器输出性能的影响，对比了有无磁性液体时俘能器的输出性能。结果表明：磁铁间距、悬浮磁铁与磁性液体的总质量和激励加速度能有效地改变俘能器的工作频率范围和输出功率幅值，而阻尼比主要影响输出功率幅值。新型俘能器输出电压峰峰值和输出功率峰值分别达到426.88mV和0.56mW，增加磁性液体后输出电压和功率分别提升了22.67%和75%，对比其它低频振动俘能器，具有较优的输出功率特性。新型磁浮式俘能器的结构形式与建立的动力学模型能为拓宽此类俘能器工作频带范围和增强输出功率性能提供新的解决思路，具有良好的参考价值。

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.

导出引用

张宪文，李国正，王伟杰，苏树强. 基于磁性液体的磁浮式振动俘能器系统建模与输出性能分析[J]. 振动与冲击, 2024, 43(1): 218-229

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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