光电工程, 2018, 45 (5): 170686, 网络出版: 2018-06-01   

空间轻小型反射镜柔性支撑设计与动力学分析

Design of flexure support of space compact reflector subassembly and dynamic analysis
作者单位
1 长春理工大学空间光电技术国家地方联合工程研究中心,吉林 长春 130022
2 天津大学精密仪器与光电子工程学院,天津 300072
3 天津津航技术物理研究所,天津 300308
摘要
针对某星载激光通信中光电跟瞄系统的反射镜组件进行研究,对比了三种柔性支撑方案,结合空间载荷实际应用情景综合评估结构的刚度优势和面形精度。分析结果表明,颈口侧壁开槽的柔性支撑方案在重力和温度变化影响下的面形精度(RMS)可达2.05 nm和8.88 nm,基频模态为926.1Hz,在保证面形精度的柔性要求与高刚度抵御振动损坏的平衡中,这种柔性设计方案最为合理。进一步完成了柔性支撑结构的参数优化设计并进行了动力学分析,频率响应下应力最大值为96 MPa,小于材料的抗拉强度极限;随机振动分析结果表明,反射镜加速度响应均方根为11.14 g RMS,并满足3σ准则。文章最后通过0.2 g正弦扫频试验,验证了有限元模态分析相对误差为2.4%。实验结果表明,分析结果基本准确可靠,柔性环节设计可靠,满足使用要求。
Abstract
The mirror assembly of an electro-optical tracking and pointing system for a space borne laser communication system is studied, three flexible supports are contrasted, according to practical applications of space load, the structural stiffness advantage and surface figure of the three flexible support scheme have been evaluated. The analysis results show that the surface figure RMS of neck side grooving flexible support scheme resisting micro- gravity and thermal environment change can reach 2.05 nm and 8.88 nm, the fundamental frequency mode is 926.1 Hz, in the balance between the surface figure RMS and the higher stiffness resisting hevibration damage, the flexible design is most reasonable. On this basis, the parameterized design of the flexible support structure of the reflector is completed and dynamic analysis have been done. The maximum stress of the frequency response is 96 Mpa, which is less than the material’s tensile strength limit. The results of random vibration analysis show that root mean square of acceleration response is 11.14 g RMS, meeting 3σ law. Finally, a 0.2 g sine sweeptest proves that the relative error of the modal analysis is 2%, 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 use.

柳鸣, 张立中, 李响, 李小明, 张家齐, 孟立新, 刘俊杰. 空间轻小型反射镜柔性支撑设计与动力学分析[J]. 光电工程, 2018, 45(5): 170686. Liu Ming, Zhang Lizhong, Li Xiang, Li Xiaoming, Zhang Jiaqi, Meng Lixin, Liu Junjie. Design of flexure support of space compact reflector subassembly and dynamic analysis[J]. Opto-Electronic Engineering, 2018, 45(5): 170686.

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