悬臂梁
压电
振动
能量收集
声学
球(数学)
叠加原理
电压
机械能
摇摆
梁(结构)
发电
材料科学
功率(物理)
物理
工程类
结构工程
电气工程
量子力学
数学分析
数学
作者
Kangqi Fan,Zhaohui Liu,Haiyan Liu,Liansong Wang,Yang Zhu,Bo Yu
摘要
This study presents a shoe-mounted nonlinear piezoelectric energy harvester (PEH) with intent to capture energy from human walking. The PEH consists of a piezoelectric cantilever beam magnetically coupled to a ferromagnetic ball and a crossbeam. A sleeve is included to guide the travel of the ball. Experimental measurements and theoretical simulations demonstrate that the proposed design can collect energy from diverse excitation sources with different directions produced by the foot, including vibrations, swing motions, and the compressive force. The ball and the crossbeam sense the swing motion and the compressive force, respectively, and then actuate the piezoelectric beam to function. The piezoelectric beam senses the vibration along the tibial axis and generates electricity. The proposed PEH achieves the superposition of these excitations and generates multiple peaks in voltage output within one gait cycle. The output power generated by the fabricated prototype ranges from 0.03 mW to 0.35 mW when the walking velocity varies from 2 km/h to 8 km/h.
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