| 申俊， 宋芳.带U型切口的非线性压电能量采集器的动力学仿真研究[J].轻工机械,2022,40(1):85-90 |
| 带U型切口的非线性压电能量采集器的动力学仿真研究 |
| Dynamics Simulation Analysis of Nonlinear U Shaped Cutout Piezoelectric Energy Harvester |
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| DOI：10.3969/j.issn.1005 2895.2022.01.014 |
| 中文关键词: 压电采集器 谐响应分析 低频振动能 系统势函数 采集频带 |
| 英文关键词:piezoelectric harvester harmonic response analysis low frequency vibration energy system potential function acquisition frequency band |
| 基金项目: |
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| 中文摘要: |
| 针对目前压电采集器采集频带较窄、采集效率较低的问题，笔者在压电采集器中引入磁场构建了非线性振动系统，拓宽了采集器的采集频带。设计了一种带U型切口的非线性压电振动能量采集器；通过建立采集器的理论模型，分析了该采集器的势能系统，并仿真研究了不同激振频率下内梁磁铁与外梁磁铁的水平间距D的改变对采集器输出均方根电压的影响。数值分析发现：减小间距D，可以使该采集器的内、外梁的势能系统从单稳态系统过渡到双稳态系统；并随着间距D的减小，该能量采集器在其谐振频率处输出的均方根电压逐渐增大，但对该能量采集器的有效采集频带影响并不大。该研究表明引入磁场的带U型切口的双悬臂压电梁能有效提高压电能量采集器采集效率。 |
| 英文摘要: |
| Aiming at the problems of narrow acquisition frequency band and low acquisition efficiency of piezoelectric energy harvester, a nonlinear vibration system was constructed based on the introduction of magnetic field into piezoelectric energy harvester to broaden the acquisition frequency band of the energy harvester. A nonlinear piezoelectric vibration energy harvester with U shaped cutout was designed. By establishing the theoretical parameter model of the energy harvester, the potential energy system of the energy harvester was analyzed, and the influence of the change of the horizontal distance D between the inner beam magnet and the outer beam magnet on the output RMS voltage of the energy harvester under different excitation frequencies was studied by simulation. The numerical analysis shows that the potential energy system of the inner and outer beams of the energy harvester can transition from monostable system to bistable system by reducing the distance D. With the decrease of the distance D, the RMS voltage output by the energy harvester at its resonant frequency gradually increases, while it has little effect on the effective acquisition frequency band of harvester. The results show that the double cantilever piezoelectric beam with the introduction of magnetic field and U shaped cutout can effectively improve the acquisition efficiency of piezoelectric energy harvester. |
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