等应力楼梯压电俘能装置数学建模与实验研究（英文）

Mathematical modeling and experimental study of isostress stair piezoelectric harvester

为了提高楼梯压电俘能装置的发电效率,设计了一种等应力式压电俘能单元结构,建立了等应力式压电俘能单元结构的压电俘能数学模型;搭建了压电俘能性能测试实验平台,对无等应力块和有等应力块的悬臂梁压电俘能装置进行了对比实验测试,实验结果表明:当振动激励条件相同时,有等应力块的等应力压电俘能装置的集电效率高于无等应力块的悬臂梁压电俘能装置;在低频激励条件下,当激励位移不变时,两种装置的俘能超级电容电压均随激励频率的增大而减小;当激励频率不变时,两种装置的俘能超级电容电压随激励位移的增大而增大。

To improve the power generation efficiency of stair piezoelectric harvester, an isostress piezoelectric harvesting unit structure was designed, and the corresponding mathematical model was established and solved. Through the piezoelectric harvesting experimental platform, the performance has been obtained and comprehensive comparisons were conducted for cantilever piezoelectric harvester with and without isostress block. The resuhs showed that under the same vibrational excitation condition, the piezoelectric harvester with isostress block had a higher current collection efficiency than that without isostress block; under low frequency excitation condition, when the excitation displacement is constant, the supercapacitor voltages of two devices gets decreased with the increase of excitation frequency; when the excitation frequency is constant, the supercapacitor voltages of two de- vices both increased with excitation displacement.