【摘要】 剪切模式压电俘能器利用较高的压电系数d₁₅,理论上能够收集到更多的能量。该文设计了一种基于d₁₅模式的L型基座压电俘能器,通过有限元仿真分析与直立型结构进行了对比。结果表明,L型结构不发生谐振时的俘能性能与直立型结构基本相同,在很宽频带内均有稳定的能量输出;而在一阶模态频率,L型结构的输出功率有大幅增加。该文制作了L型基座d₁₅模式PZT-51压电俘能器,实测表明,压电俘能器的谐振频率为86 Hz,当加速度为2.5g（g=9.8m/s²）时,在匹配负载203kΩ上输出功率为31.25μW,对应单位重力加速度下的功率密度为84μW·cm^-3。更多还原

【Abstract】 The shear-mode piezoelectric energy harvester（PEH）offers potentially improved energy harvesting due to higher d₁₅ piezoelectric coefficient than other modes.An L-type base PEH based on d₁₅-mode was designed in this paper.The comparison between the L-type structure and the upright structure are carried out through the finite-element simulation analysis.It is shown that the performance of L-type PEH are basically the same as upright PEH when the resonance does not occur,and there is a stable energy output over a very wide band;while the output power of L-type PEH has increased substantially at the first order modal frequency.An L-type base PZT-51 PEH prototype based on d51 mode is fabricated.The measured results show that the resonant frequency of PEH is 86 Hz,the output power is 31.25μW with the acceleration of 2.5 g（g=9.8 m/s²）at the matching load of 203 kΩ,and the corresponding power density is 84μW·cm^-3 at the unit gravity acceleration.更多还原