基于力电响应的压电悬臂梁疲劳寿命预测

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (17) : 314-322.

论文

基于力电响应的压电悬臂梁疲劳寿命预测

冯逸亭，刘文光，吴兴意

作者信息 +

Fatigue life prediction of piezoelectric cantilever beam based on electromechanical response

FENG Yiting, LIU Wenguang, WU Xingyi

Author information +

文章历史 +

摘要

针对压电振动能量收集器的疲劳问题，旨在研究基于力电响应的压电悬臂梁振动疲劳寿命预测方法。结合压电悬臂梁振动疲劳实验测得的实验结果，以剩余刚度理论和“两段式”疲劳寿命分析模型为基础提出一种基于谐振频率的压电悬臂梁疲劳寿命预测方法；进一步分析振动疲劳过程中谐振频率变化与负载功率变化的关系模型，提出一种基于负载功率的压电悬臂梁疲劳寿命预测方法。结果表明：基于谐振频率的压电悬臂梁疲劳寿命预测方法的平均误差在10~20%之间，其误差范围控制在1.5倍误差线以内；而基于负载功率的压电悬臂梁疲劳寿命预测方法的平均误差集中于25%左右，误差范围均控制在2倍误差线以内且属于偏安全的预测效果。

Abstract

Aiming at the fatigue problem of piezoelectric vibration energy harvester, the vibration fatigue life prediction method of piezoelectric cantilever beam based on electromechanical response is studied. Based on the residual stiffness theory and the "two-stage" fatigue life analysis model, a fatigue life prediction method of piezoelectric cantilever based on resonant frequency is proposed; The relationship model between the change of resonant frequency and the change of load power in the process of vibration fatigue is further analyzed, and a fatigue life prediction method of piezoelectric cantilever beam based on load power is proposed. The results show that the average error of the piezoelectric cantilever fatigue life prediction method based on resonant frequency is between 10%~ 20%, and the error range is controlled within 1.5 times the error line; The average error of the piezoelectric cantilever fatigue life prediction method based on load power is about 25%, and the error range is controlled within twice the error line, which belongs to the prediction effect of partial safety.

导出引用

冯逸亭，刘文光，吴兴意. 基于力电响应的压电悬臂梁疲劳寿命预测[J]. 振动与冲击, 2023, 42(17): 314-322

FENG Yiting, LIU Wenguang, WU Xingyi. Fatigue life prediction of piezoelectric cantilever beam based on electromechanical response[J]. Journal of Vibration and Shock, 2023, 42(17): 314-322

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