力放大式三自由度压电俘能器的设计建模与实验研究

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关键词：三自由度;振动能量收集；力放大结构;正压电效应;拉压模式中图分类号：TN384;TM619 文献标识码：Adoi：10.37188/OPE.20253318.2899 CSTR：32169.14.OPE.20253318.2899

Design，modeling and experimental research on force amplification type three-degree-of-freedom piezoelectric energy harvester

XU Dongmei，YANG Yang，YU Simiao， ZHANG Chi， PAN Jianan， ZHANG Xuhui （Shaanxi Key Laboratory ofMine Electromechanical Equipment Intelligent Detection and Control， South China Xi' an University of Science and Technology，Xi'an 71Oo54，China） * Corresponding author， E -mail： dongmeixu@xust. edu. cn

Abstract： To improve the energy conversion eficiency of a single-degree-of-freedom（SDOF） piezoelectric energy harvester and broaden its operational direction，a novel three-degree-of-freedom （3-DOF） piezoelectric energy harvester had ben designed by integrating the piezoelectric energy conversion mechanism，multi-degree-of-freedom piezoelectric harvesting principles，and force amplification structures.The proposed harvester had consisted of orthogonally arranged cantilever-beam harvesters and a force-amplified compression-tension mode harvester. A simulation model had been established using MATLAB/Simulink to analyze the efects of excitation and structural parameters on the system’s dynamic response.Based on the simulation，a prototype had been fabricated and experimentally validated.The results had demonstrated that the harvester could effectively generate electrical energy along the X ， Y ，and Z directions，with structural parameters （cantilever spacing，proof mass，and spring stifness） significantly influencing its performance.Experiments showed that the X and Y directions achieved an output power of 2.924mW ata load resistance of 15kΩ ，capable of illuminating 22 LEDs，while the Z direction delivered 4.871mW at （204号 40kΩ ， powering 33 LEDs. The findings confirm the harvester’s stable energy output across different vibration directions，demonstrating its feasibility for powering low-power wireless sensors. This study pro vides theoretical guidance for the design of novel multi-degree-of-freedom piezoelectric energy harvesters.

Key words： three degrees of freedom；vibration energy collection； force amplification structure； positive piezoelectric effect;tension-compression mode

1引言

近年来，环境能量收集技术已经成为学者们的热门研究方向，其依托传感器技术的快速发展受到一定关注[1-4]。（剩余16277字）