基于材料疲劳的压电俘能器结构设计
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国家高技术研究发展计划(“八六三”计划)基金资助项目

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Structure Design of Piezoelectric Harvester Based on Material Fatigue
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    摘要:

    现有的压电俘能器是通过增加振幅来提高俘能器的输出功率,但这种方法增加了压电材料的疲劳负担,使锆钛酸铅压电陶瓷(PZT)表面产生裂纹并迅速扩展,这使得整个俘能器的固有频率显著降低,对于俘能带宽本就很窄的压电俘能器来说无疑是毁灭性的。该文通过线性弹簧来拟合PZT的表面裂纹,建立了等效模型并推导出表面裂纹对结构固有频率影响的理论公式。理论推导得到了裂纹不扩展时的压电俘能器结构与环境的限制条件,并通过实验进行了验证。实验结果表明,当俘能器的振幅小于外加电场为1.5倍矫顽电场所等效的振幅时,系统的固有频率几乎不发生改变;而当俘能器的振幅大于此等效振幅时,系统的固有频率明显降低,而且振幅越大,下降速度越明显。

    Abstract:

    In recent research about piezoelectric energy harvester, increasing the amplitude is usually used to improve its output power.But this approach will greatly increase the fatigue burden of the piezoelectric material and make the PZT material surface cracks and rapidly expand, which results in a significant reduction in the natural frequency of the energy harvester. It is undoubtedly devastating for the piezoelectric energy harvester with a narrow bandwidth. The surface cracks of PZT are fitted by linear spring, the equivalent model is established and the theory formula about the effect the surface cracks on the natural frequencies is derived.The limiting conditions of the structure and environment of the piezoelectric energy harvester are obtained when the crack is not expanded and some experiments are carried out to prove the theory.The results show that the natural frequency of the system will almost not change when its amplitude is less than the equivalent amplitude of 1.5 times the coercive electric field, and the natural frequency will decreased significantly when its amplitude is greater than the equivalent amplitude, and the greater the amplitude,the more obvious the decrease speed of the cracks extension.

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陈林雄, 高世桥, 董新博.基于材料疲劳的压电俘能器结构设计[J].压电与声光,2017,39(4):539-543. CHEN Linxiong, GAO Shiqiao, DONG Xinbo. Structure Design of Piezoelectric Harvester Based on Material Fatigue[J]. PIEZOELECTRICS AND ACOUSTOOPTICS

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  • 在线发布日期: 2017-08-14
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