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在航天侦察系统中,由于光学系统的视场角较小,难以满足系统宽覆盖范围的要求,所以往往采用指向摆镜,并绕两轴连续地或间歇地摆动来对地面不同位置的目标进行观测。但是由于空间工作环境会使光学指向摆镜的形状及内部应力发生变化,进而会对其光学特性产生明显的影响,因此对它进行工程分析就显得尤为重要。运用有限元法,对轻量化后的碳化硅指向摆镜在不同加速度条件下的面形和内部应力的变化作了研究和分析,同时对轻量化后的碳化硅指向摆镜在不同的温度场中的面形和内部应力的变化也作了研究和分析,为侦察系统的光学设计和结构设计提供了一些可供参考的数据。
In the spacecraft reconnaissance system, it is difficult to meet the requirement of wide coverage of the system due to the small field of view of the optical system. Therefore, it is common to use a pointing mirror and swing continuously or intermittently about two axes to target different places on the ground Observation. However, due to the spatial working environment will change the shape and internal stress of the optical pointing pendulum, which will have a significant impact on its optical characteristics, it is particularly important for engineering analysis. The finite element method was used to study and analyze the change of surface shape and internal stress under different accelerations of the light-weight silicon carbide pointing mirrors. At the same time, the change of the light-weight silicon carbide pointing mirrors in different temperature fields In the shape and internal stress changes also made a study and analysis of the reconnaissance system for optical design and structure design provides some reference data.