用于柔性板振动控制的压电陶瓷时效损伤性能研究

目的基于压电陶瓷的逆压电效应,以试验和仿真分析的方法研究压电陶瓷对某柔性板试验件振动控制的时效性能,为压电陶瓷如何保持长时间有效参与振动控制提供参考。方法搭建振动主动控制系统,实现柔性板的振动控制,以压电陶瓷驱动电压的降低模拟时效损伤。建立该结构的动力学有限元模型,并进行响应分析,以压电陶瓷产生的驱动力变小来模拟时效损伤。通过测定不同损伤程度的压电陶瓷参与振动控制前后的动响应,得到多种条件下的振动控制效率。结果当所有压电陶瓷的时效损伤程度均达到80%时,对某柔性板试验件的振动控制率降低为初始振动控制率的60.4%。基于试验与分析结果,评估多种条件下的振动控制率,得到了压电陶瓷时效损伤对柔性板振动控制的影响规律。结论压电陶瓷时效损伤对柔性板振动控制的影响可以用有限元仿真来模拟,压电陶瓷的时效损伤程度可通过调节它的驱动电压来进行测试。

Time-dependent Damage Performance Study of Piezoelectric Ceramics for Vibration Control of Flexible Plates

This paper aims to provide a reference for the piezoelectric ceramics participating in the vibration control efficiently for a lengthy time. The time-dependent performance of the piezoelectric ceramics in vibration control of the flexible plate is studied by the test and simulation based on the inverse piezoelectric effect. On the one hand, to realize the vibration control of the flexible plate, an active vibration control system is built, and the time-dependent damage is simulated by means of decreasing the driving voltage of the piezoelectric Ceramics; On the other hand, the dynamic finite element model of the structure is established for response analysis. The time-dependent damage of the piezoelectric ceramics is simulated with the aid of reducing the driving forces produced by the piezoelectric ceramics. When the piezoelectric ceramics are in different degrees of time-dependent damage, the vibration control rates are calculated after the dynamic responses before and after vibration control are measured. Among the rates, when the degree of the time-dependent damage of all piezoelectric ceramics reaches 80%, the vibration control rate of a flexible plate test piece is decreased to 60.4% of the initial vibration control rate. The influence rule of the time-dependent damage of piezoelectric ceramics on vibration control is obtained by evaluating the vibration control rates calculated from the experimental results and simulated results under various conditions. Both the experimental and simulated results indicate that the finite element simulation can be used to simulate the impact on vibration control of flexible plate when the piezoelectric ceramics are subject to the time-dependent damage, and the degree of the time-dependent damage of piezoelectric ceramics can be tested by adjusting its operating voltage.