太空衍射望远镜大型桁架展开过程动力学建模

在太空衍射望远镜桁架展开过程中，各个桁架单元展开锁定的瞬间会引起构件的弹性振动，并对星体与主镜产生较大冲击。在考虑桁架各部件弹性变形的基础上，针对系统拓扑结构和约束条件的变化，对桁架展开与锁定过程建立了变拓扑的柔性多体系统动力学模型并进行了动力学数值分析。当桁架单元锁定时通过在关节处施加强力矩和阻尼来模拟锁定机构的作用。数值仿真结果表明，在锁定瞬时，桁架在纵向呈现大幅度振动，星体与主镜受到的冲击力出现峰值，且每一次峰值有差异，呈现周期性变化，这种现象是由桁架柔性部件的弹性变形引起的。研究结果对太空衍射望远镜结构设计与动力学控制提供了技术参考。

Dynamic modeling for the deployment of the folded truss of space diffraction telescope

In the process of truss deployment of space diffraction telescope, the moment of unfolding and locking of each truss element will cause the elastic vibration of the member and have a great impact on the star and the main mirror. On the basis of considering the elastic deformation of the truss components, a flexible multibody system dynamics model with variable topology was established for the truss expansion and locking process according to the changes of the system topology and constraints, and the dynamic numerical analysis was carried out. When the truss element was locked, the action of the locking mechanism was simulated by applying strengthening torque and damping at the joint. The numerical simulation results show that at the moment of locking, the truss vibrates greatly in the longitudinal direction, and the impact force on the star and the main mirror shows a peak value, and each peak value is different and changes periodically. This phenomenon is caused by the elastic deformation of the flexible parts of the truss. The research results provide a technical reference for the structural design and dynamic control of the space diffraction telescope.