天基激光测距载荷单反射镜组件柔性设计与力热稳定性分析

针对激光通信与测距一体化星间链路载荷轻小型单反射镜组件进行结构设计与力热稳定性研究，开展单反镜柔性支撑机构优化设计，根据运载力学环境与在轨力热环境工况，对反射镜组件进行光机集成分析，验证光机结构的在轨力热稳定性.分析结果表明，双层圆弧形槽口柔性支撑结构在温度拉偏后反射镜的面型精度均方根（RMS）可达λ/72，基频模态为417.93Hz，满足指标要求.进一步对反射镜组件进行动力学分析，随机振动分析结果表明，反射镜加速度响应均方根为11a_rms，满足3σ准则.通过0.2g正弦扫频试验验证了有限元模态分析相对误差为2.23%，实验结果表明，反射镜组件柔性支撑设计合理，力热稳定性分析结果基本准确可靠，满足工况要求. 

Flexible Design and Thermal Stability Analysis of Reflector Assembly of Space-based Laser Ranging Load

In this paper, the structure design and thermal stability of the light and small reflector component of laser communication and ranging integration satellite link load are studied. Optimization design of flexible support mechanism of reflector component is carried out. According to the working conditions and in-orbit thermal environment, the optical component integration analysis of the mirror assembly is carried out to evaluate the on-track thermal stability of the opto-mechanical structure. The analysis results show that the surface precision of the mirror with double-layer circular arc slot flexible support structure can be reached at λ/72 after temperature deflection, the fundamental frequency mode is 417.93Hz, meeting the requirements of the index. Furthermore, the dynamic analysis of the mirror assembly is carried out, the results of random vibration analysis show that the root mean square of the acceleration response of the mirror is 11a_rms and meet the 3σ criterion. Finally, a 0.2g sine sweep test proves that the relative error of the modal analysis is 2.24%, the experimental result show that the analysis results are basically accurate and reliable, that is, flexible support design is reliable to meet the requirements of the use.