星载二维转台结构设计及刚度分析

Structure design and stiffness analysis of spaceborne two-dimensional turntable

星载二维转台是激光通信指向结构的重要组成部分,也是影响星载设备性能的关键部件之一,需要对其进行合理的结构设计和正确的刚度分析,并通过对比试验结果与仿真结果验证设计分析的正确性。首先,介绍了星载二维转台结构形式,基于Isight集成优化方法对比分析了摆镜组件的两种结构形式,并对U形架和轴系结构进行了刚度设计;然后,对二维转台进行有限元建模并重点介绍了轴承的弹簧单元等效建模方式;最后,对星载二维转台进行了刚度分析和试验验证,二维转台在X、Y、Z三个方向上仿真计算的固有频率与试验结果误差在6%以内,表明等效弹簧单元能准确模拟轴承结合部的力学特性。通过对星载二维转台的力学试验验证表明,在保证了二维转台的质量约束和刚度要求下,各部分组成部件结构刚度设计和刚度分析合理,二维转台抗力学性能满足激光通信的任务需求。

Spaceborne two-dimensional turntable is an important part of the laser communication pointing structure and one of the key components affecting the performance of the satellite-based equipment,which requires reasonable structural design and correct stiffness analysis,and the correctness of the design analysis is verified by comparing the test results with the simulation results.Firstly,the structural form of spaceborne twodimensional turntable was introduced,two structural form of pendulum mirror assembly was compared and analyzed based on Isight integration and optimization method,the stiffness design of the U-shaped frame and shaft system was completed.Then,finite element modeling of the two-dimensional turntable was conducted and the spring unit equivalent modeling of the bearing was focused on.Finally,the stiffness analysis and test verification of the spaceborne two-dimensional turntable were carried out.The error between the natural frequency of the two-dimensional turntable in the X,Y,and Z directions of the simulation calculation and the test result was within 6%,indicating that the equivalent spring unit can accurately simulate the mechanical characteristics of the bearing joint.The dynamics test of the two-dimensional turntable shows that the mass constraint and stiffness requirements of the two-dimensional turntable are ensured,the structural stiffness of each component part is reasonably designed,and the mechanical resistance of the two-dimensional turntable meets the mission requirements of laser communication.