An Electromagnetic Energy Harvester of Large-Scale Bistable Motion by Application of Stochastic Resonance
An Electromagnetic Energy Harvester of Large-Scale Bistable Motion by Application of Stochastic Resonance
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DOI：
10.1115/1.4051265
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Wei Zhao;R. Zheng;X. Yin;Xilu Zhao;Kimihiko Nakano
中科院分区：
文献类型：
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作者：
Wei Zhao;R. Zheng;X. Yin;Xilu Zhao;Kimihiko Nakano
振动能量收集已经吸引了相当多的研究注意力，用于从环境振动中收集电力。因此，本研究首先开发了一种通过应用随机共振的大规模往复运动的电磁能量收集器，以提高在宽低频下的能量收集效率。电磁能量采集器由电磁线圈发电机和弹簧支撑的弹簧质量系统组成。首先，考虑到磁体和线圈的相互位置关系，首次提出了加权函数，并同时建立了考虑弹性弹簧恢复力和电磁感应洛伦兹力的运动方程和电磁感应方程。通过数值分析求解联立方程组，得到系统响应位移和感应电压，数值解与验证实验的测量结果吻合较好。在此基础上，考虑法向摩擦阻尼力和电磁感应阻尼力的相互作用，确定了阻尼系数，并详细讨论了电磁感应阻尼对系统响应位移的影响。最后，实验结果表明，随机共振现象实际上发生了大规模的往复运动，它进一步验证了发电效率可以显着提高系统响应位移的振幅放大。
Vibrational energy harvesting has attracted considerable research attention for electrical power collection from ambient vibrations. Thereby, this study first developed an electromagnetic energy harvester of large-scale bistable motion by application of stochastic resonance, to enhance energy harvesting efficiency at a broadly low frequency. The electromagnetic energy harvester is fabricated by a magnet-coil generator and an oblique-supported spring-mass system. In the beginning, a weighting function is originally proposed considering mutual position relationship of the magnet and coil, and a motion equation and an electromagnetic induction equation are simultaneously established considering both elastic spring recovery force and electromagnetic induction Lorentz force. Subsequently, numerical analysis is processed to resolve the simultaneous equations to obtain systematic response displacement and the induced voltage, and the numerical solutions are accurately consistent with the measuring results in validation experiments. Furthermore, a damping coefficient is identified considering the mutual effectiveness of the damping forces from the normal friction and electromagnetic induction, and the influence of electromagnetic induction damping on systematic response displacement is carefully discussed. Eventually, experimental results clarified that the stochastic resonance phenomenon actually occurred as a large-scale bistable motion, and it is further validated that power generation efficiency can be noticeably enhanced following amplitude amplifications of systematic response displacement.