In order to find out the dynamic peculiarity of piezoelectric-stack displacement-amplifying actuator, three methods: humorous response analysis, impedance test and dynamic grating projection are used to analyze it. ANSYS software analyses its mode and displacement with frequency variation. The method of impedance test is applied to measure its resonance frequency. Finally the method of dynamic grating projection is used to measure its displacement status of charge and discharge. Experimental results indicate that natural frequency of the displacement-amplifying mechanism is 1724Hz, it can provide large output torque; the resonance frequency of this kind of piezoelectric actuator is 8.3 kHz, its reverse resonance frequency is 8.75 kHz, its response time is less than 0.3ms; its mutation time of displacement is less than 0.5ms, the fluctuation of displacement is less than 5um, and the change of displacement vs. voltage is linearity variety；its dynamic displacement is smooth, when discharging. After analyzing the actuator, some virtues of dynamic response peculiarity are shown: rapidly responding, tiny displacement fluctuates, fine displacement linearity, higher precision, large output torque, etc. Therefore it can be abroad applied in many micro-displacement control and drive systems, which need high precision and large displacement. Its application prospect is worth to expect.
Jin Hong;Jin Long;Wu Ming-qing;Bao Shi-jie;Xu Zhi-ke.
Dynamic Peculiarity of Piezoelectric-stack Displacement-amplifying Actuator[J]. Journal of Vibration and Shock, 2012, 31(21): 146-151
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