基于时变势阱调控的内共振压电能量收集器实验研究

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中图分类号：TM619

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Experimental Study on Multi-directional Piezoelectric Energy Harvester with Internal Resonance and Time-varying Potential Wells

LIU Qile，SHEN Hui （College of Mechanical and Electrical Engineering，Qingdao University，Qingdao 266o71，China）

Abstract： To address the low energy harvesting eficiency of conventional energy harvesters under low-frequency broadband vibration excitation，an internal resonance piezoelectric energy harvester with time-varying potential wells （TI-PEH） was proposed. TI-PEH consists of a piezoelectric cantilever beam，an inverted auxiliary beam，a magnetic pendulum，limiters，a magnet at the free end of the inverted auxiliary beam，and a mass block. The elastically supported magnet is introduced to create time-varying potential wells，enhancing the coupling effects between internal resonance and nonlinear magnetic interactions. The experimental results show that within the range of 2～5Hz ，compared with the traditional structure，the maximum root mean square （RMS） voltage of the TI-PEH under 0.1g excitation intensity is increased by 276% . Under random excitation conditions，the coupling effect between the time- varying potential well and the internal resonance can significantly enhance the output performance of the TI-PEH. Furthermore，stifness reduction of the auxiliary beam enables the TI-PEH's operational bandwidth to shift toward lower frequencies， demonstrating superior energy harvesting performance in ultralow-frequency vibration environments. Keywords： energy harvesting； internal resonance； time-varying potential wells； nonlinear

物联网（Internetof Things，IoT）的微型化推动了对新型清洁能源发展的需求，振动能量收集（Vibra-tion Energy Harvesting，VEH）技术成为替代化学电池的重要研究方向之一[1-3]。（剩余9323字）