红外与激光工程
紅外與激光工程
홍외여격광공정
INFRARED AND LASER ENGINEERING
2014年
z1期
83-88
,共6页
反射镜组件%空间相机%轻量化%柔性支撑%有限元分析
反射鏡組件%空間相機%輕量化%柔性支撐%有限元分析
반사경조건%공간상궤%경양화%유성지탱%유한원분석
mirror subassembly%space camera%lightweight%flexure support%finite element analysis
针对某空间相机1.1 m口径反射镜的光机结构设计任务，为降低反射镜的重量，提高其环境适应性，设计了一种重力变形小、抗振性强、热尺寸稳定性高的空间反射镜结构系统。首先，详细分析了反射镜及支撑结构选材依据及应考虑的主要因素。然后，提出一种背部半封闭式扇形轻量化孔的反射镜轻量化结构方案，并利用参数化建模分析的方法对其结构参数进行了优化设计。采用背部三点柔性支撑方式对反射镜进行支撑，通过柔性铰链的柔性来调节由于装配中的过定位和热环境变化导致的反射镜面形精度降低问题。最后，对反射镜组件的力学和热特性分析结果表明，反射镜在X向1g重力作用下反射镜面形精度PV为62.4 nm，RMS为5.7 nm，在20±4℃环境温度变化范围内面形精度达到PV为61.7 nm，RMS为6.3 nm，反射镜组件基频为150 Hz，能够满足静态刚度、动态刚度和热尺寸稳定性的设计指标要求。
針對某空間相機1.1 m口徑反射鏡的光機結構設計任務，為降低反射鏡的重量，提高其環境適應性，設計瞭一種重力變形小、抗振性彊、熱呎吋穩定性高的空間反射鏡結構繫統。首先，詳細分析瞭反射鏡及支撐結構選材依據及應攷慮的主要因素。然後，提齣一種揹部半封閉式扇形輕量化孔的反射鏡輕量化結構方案，併利用參數化建模分析的方法對其結構參數進行瞭優化設計。採用揹部三點柔性支撐方式對反射鏡進行支撐，通過柔性鉸鏈的柔性來調節由于裝配中的過定位和熱環境變化導緻的反射鏡麵形精度降低問題。最後，對反射鏡組件的力學和熱特性分析結果錶明，反射鏡在X嚮1g重力作用下反射鏡麵形精度PV為62.4 nm，RMS為5.7 nm，在20±4℃環境溫度變化範圍內麵形精度達到PV為61.7 nm，RMS為6.3 nm，反射鏡組件基頻為150 Hz，能夠滿足靜態剛度、動態剛度和熱呎吋穩定性的設計指標要求。
침대모공간상궤1.1 m구경반사경적광궤결구설계임무，위강저반사경적중량，제고기배경괄응성，설계료일충중력변형소、항진성강、열척촌은정성고적공간반사경결구계통。수선，상세분석료반사경급지탱결구선재의거급응고필적주요인소。연후，제출일충배부반봉폐식선형경양화공적반사경경양화결구방안，병이용삼수화건모분석적방법대기결구삼수진행료우화설계。채용배부삼점유성지탱방식대반사경진행지탱，통과유성교련적유성래조절유우장배중적과정위화열배경변화도치적반사경면형정도강저문제。최후，대반사경조건적역학화열특성분석결과표명，반사경재X향1g중력작용하반사경면형정도PV위62.4 nm，RMS위5.7 nm，재20±4℃배경온도변화범위내면형정도체도PV위61.7 nm，RMS위6.3 nm，반사경조건기빈위150 Hz，능구만족정태강도、동태강도화열척촌은정성적설계지표요구。
For some 1.1 m diameter space mirror opto- mechanical design task, in order to decrease the weight of the mirror, improve its environmental adaptability, a small gravity deformation and strong vibration resistance, high thermal stability of space mirror structure system was designed. Firstly, mirror and support structure material selection principles and the matters needing attention were analyzed in detail. Then, a semi- closed back with a fan- shaped lightweight hole mirror lightweight structure schemes was proposed, and by using the method of parametric modeling, analysis of its structural parameters optimization design was carried out. The back three- point flexible support scheme was used to support the mirror. By adjusting the flexibility of flexure hinge can solve the problem of mirror surface figure accuracy degradation caused by assembly position and thermal environment change. Finally, on the mechanical and thermal properties of the mirror subassembly analysis results show that, the surface figure accuracy of the mirror was PV 62.4 nm and RMS 5.7 nm under load case of 1 g gravity in the direction of X axis, in the 20 ±4℃ environment temperature range the surface figure accuracy reached PV 61.7 nm, RMS 6.3 nm, and the fundamental frequency of the mirror subassembly was 150 Hz which can satisfy the static stiffness, dynamic stiffness and thermal dimensional stability index requirements.
