压电驱动六自由度指向平台的力电耦合分析

In the research of high precision pointing mechanism, we are faced with a comprehensive mechanical-electrical problem including multiple components, rigidity and flexibility. For the high precision fine-tuning pointing performance of the mechanism and subsequent control research, it is necessary to establish and obtain the relationship between input and output of the entire system, namely the relationship between the voltage of piezoelectric actuator and the pointing of the mechanism. Based on the electromechanical coupling theory of piezoelectric materials, analytical and numerical prediction methods for the input voltage of piezoelectric actuator and the output attitude are established for a six-degree-of-freedom platform with considering the effects of electromechanical coupling, displacement amplification mechanism and elastic deformation of flexible components. It includes the component-level and system-level analysis theory and numerical simulation methods. The calculation results show that the proposed analytical and numerical methods can predict the motion of six-degree-of-freedom platform and provide important guidance for the platform design.