Design and Experiment of Two-dimensional Torque Output Actuator for Vibration Suppression
A piezoelectric actuator with two-dimensional torque output is proposed to meet the vibration suppression requirements of large-scale space truss antennas.The actuator is mainly composed of support body,four piezoelectric drivers and four amplification mechanisms,in which the amplification mechanism is designed with groove dimension to solve the problem of matching the overall stiffness and structural strength in the traditional amplification mechanism.The performance of the actuator is analyzed,the constitutive equation of piezoelectric ceramic stacking and equivalent amplification relationship of amplification mechanism are established,the influence of structural parameters and input parameters on the amplification ratio of amplification mechanism is revealed,and the modal mode shape characteristics of actuator are obtained.The principle prototype of actuator is developed,and the performance of the piezoelectric driver,amplification mechanism and actuator are tested.The load capacity,coupling characteristics,resolution,frequency response characteristics and response time of actuator are tested,and the test results show that the designed actuator has the characteristics of high energy density and high dynamics.The two-dimensional torque output actuator can be applied to vibration suppression of large,flexible space structures.
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