空间相机调焦平台动力学特性研究

调焦机构作为空间相机中至关重要的组成部分，其动力学性能很大程度上影响了相机的可靠性。为了完成调焦机构的动力学分析，本文以某型空间相机调焦机构平台作为研究对象，将导轨滑块作为切入点，利用优化的串联弹簧阻尼单元及有限元方法完成对导轨结合部及调焦平台的建模。本文基于Hertzian接触理论获取动力学参数，将调焦机构中与导轨关联的滚珠丝杠和联轴器的刚度等效至导轨滚珠上，并提出了关系表达式和修正参数。通过以联轴器为变量的对比实验获取修正参数，实现该空间相机调焦平台的动力学分析。最后本文利用该分析方法完成了在不同状态下调焦平台的动力学仿真分析，通过对比实验结果表明其误差小于2%。证明了该分析方法具备较高精度和可靠性。

Research on dynamic characteristics of space camera focusing platform

Focusing mechanism is significant components in space camera, Its dynamic performance greatly affects the reliability of the camera. In order to accomplish dynamic analysis of focusing mechanism, the research’s object is the space camera focusing mechanism platform, with the entry point that the guide, model of the guide joint and the focusing platform is built with optimized tandem spring damping element and finite element method. The research obtains dynamic parameters based on Hertzian contact theory, and equalize the rigidity of the ball screw and the coupling that are associated with the guide in the focusing mechanism to the ball on the guide, and make the relation expression and corrected parameter. Corrected parameter is confirmed by comparative experiment based on variable of coupling stiffness, completing the dynamic analysis of space camera focusing platform. Finally, the research accomplish the dynamic simulation analysis of the focusing platform by this analysis method under different condition, its experiment show the deviation is less than 2%. Proving high accuracy and reliability of the analysis method.