压电驱动式疲劳试验系统动态特性分析

针对压电驱动式疲劳试验系统动态特性分析问题,根据振动力学理论,建立了压电疲劳试验系统的动力学模型,得出了系统固有频率和动载荷表达式,并通过Matlab仿真,分析了压电振子的刚度对系统固有频率和动载荷影响关系。最后进行了实验测试,测试结果表明,实验所得数据与理论分析在误差允许范围内吻合较好,验证了理论分析的正确性。为压电驱动式疲劳试验系统谐振频率跟踪与工作载荷精度控制提供了理论依据,同时也对压电驱动式疲劳试验系统的动态性能进行预测,具有一定的工程应用价值。

Analysis of Dynamic Characteristics of Piezo-driven Fatigue Testing Machines

Aiming at the problem for the analysis of the dynamic characteristics of piezo-driven fatigue testing machine, a kinetic model of the piezoelectric fatigue test system was established based on the vibration mechanics theory.The natural frequencies and the dynamic load expression was obtained. The efffects of the stiffness of the piezoelectric vibration natural frequency and the dynamic loads were analyzed through the matlab simulation. Finally, the experimental test was carried out and the results showed that the obtained experimental data and theoretical analysis were agreed well within the error range, and the validity of the theoretical analysis was verified. The study provided a theoretical basis for tracking the piezoelectric driven system resonance frequency and controlling the work load precision, and the dynamic performance of the piezoelectric-driven fatigue test systems was predicted, thus has a certain value in engineering.