纯电力加载下压电陶瓷内环迟滞特性的实验研究

Experimental Research of Minor-loop Hysteretic Behaviors of Piezoelectric Actuator under Pure Electrical Loading

以典型压电陶瓷堆叠执行器为研究对象,对纯电力加载作用下压电陶瓷的内环迟滞行为进行了实验研究和分析。实验采用Sawyer-Tower方法获得了执行器的极化强度,利用高精度电容式位移传感器测量了执行器的输出位移,结合外围实验设备,通过计算得到了堆叠执行器在输入电压频繁折返过程中的电压-极化和电压-应变曲线。从压电陶瓷内部晶体的电畴转向角度出发,对其行为特性的产生机理进行了分析,给出了压电陶瓷堆叠执行器的建议工作区域。

A typical piezoceramic stack actuator, as the research objective herein, the experimen- tal investigation and analysis of the minor-loop hysteretic behaviors were studied. The Sawyer- Tower method was used to get the polarization and high precision capacitance sensor was used to measure the output displacement of piezoceramic actuator. Then combined with laboratory equip- ment, the polarization vs. voltage curve and strain vs. voltage curve of stack actuator were obtained when the input voltage changes frequently. From the domain switching of piezoelectric crystals, the generation mechanism of minor-loop hysteresis characteristics was analyzed. Finally, the optimum working zone of piezoceramic stack actuators is proposed.