星敏感器遮光罩的力学分析及优化设计  

Mechanical Analysis and Optimization of A Star Tracker Baffle

作　　者：吴永康 翟正一 毛晓楠 刘冰 宋卿争 WU Yong-kang;ZHAI Zheng-yi;MAO Xiao-nan;LIU Bing;SONG Qing-zheng(Shanghai Aerospace Control Technology Institute,Shanghai 201109;Shanghai key Laboratory of Aerospace Intelligent Control Technology,Shanghai 201109)

机构地区：[1]上海航天控制技术研究所,上海201109 [2]上海市空间智能控制技术重点实验室,上海201109

出　　处：《环境技术》2023年第5期6-10,共5页Environmental Technology

摘　　要：遮光罩是星敏感器抵御杂光的重要部件,一般为轻量化的薄壁结构。除了保证光学指标的实现外,还需要关注其力学性能。某星敏感器遮光罩壳体在鉴定级随机振动试验期间发生断裂。针对该问题现象,开展分析排查。通过有限元仿真分析,在试验载荷激励下,遮光罩最大应力超出材料的许用应力,且位置与实际断裂位置吻合,通过试验可再次复现问题现象,充分说明设计安全裕度不足为问题的直接原因。在此基础上,对遮光罩结构优化设计并仿真复核,有效提高了安全裕度,最终通过试验考核。The baffle is an important part of the star sensor to resist stray light,which is generally a lightweight thin-walled structure.In addition to ensuring the realization of optical indicators,it also needs to pay attention to its mechanical properties.The baffle shell of a star sensor was fractured during the qualification level random vibration test.The problem was analyzed and investigated.Through finite element simulation analysis,the maximum stress of the baffle exceeds the allowable stress of the material under the excitation of the test load,and the position is consistent with the actual fracture position.The problem phenomenon can be repeated by retesting,which fully explains that the insufficient safety margin of design is the direct cause of the problem.On this basis,the safety margin is effectively improved by optimizing and simulating the structure,and finally passes the vibration test.

关 键 词：遮光罩 断裂 随机振动 有限元 

分 类 号：V448[航空宇航科学与技术—飞行器设计]