空间遥感器高体份SiC/Al复合材料反射镜组件设计  

Design of high volume fraction SiC/Al composite mirror in space remote sensor

作　　者：齐光[1] 王书新[1] 李景林[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033

出　　处：《中国光学》2015年第1期99-106,共8页Chinese Optics

基　　金：国家高技术研究发展计划(863计划)资助项目(No.863-2-5-1-13B)

摘　　要：为消除反射镜与支撑结构材料线胀系数差异产生的热变形对反射镜面形精度、系统成像质量的影响,采用高体份Si C/Al复合材料作为新型反射镜组件的材料。首先,通过合理的结构设计及有限元分析比较,确定了Ф600 mm口径反射镜结构参数,然后,对反射镜组件进行了静力学和动力学分析,在1 g重力载荷作用下,反射镜X、Y、Z方向去除刚体位移后的镜面变形RMS值分别为12.6,12.7,12.6 nm,达到了λ/50(λ=632.8 nm)。最后,为了验证高体份SiC/Al复合材料反射镜组件的结构性能及检验结构在振动条件下的抗干扰能力,对反射镜组件进行了力学试验,反射镜组件的一阶谐振频率为556.6 Hz。力学试验前后,反射镜镜面面形误差RMS分别为0.021λ、0.025λ,没有明显变化。实验结果表明:高体份SiC/Al复合材料反射镜达到了与SiC材料反射镜相同的设计指标要求,能够满足空间应用。The difference of linear expansion coefficient between a mirror and its support structure causes mirror thermal deformation which influences the surface accuracy of mirror and the image quality of optical system.In order to avoid above influence , the high volume fraction SiC/Al composite is chosen as the only material of aΦ600 mm mirror component .TheΦ600 mm mirror structure parameters are specified by the reasonable mechanical design and finite element analysis .Using finite element analysis method , the static and dynamic characteristics of the mirror component are analyzed .Under the gravity load of 1 g, the surface figure accuracy of the high volume fraction SiC/Al composite mirror reaches RMS 12.6 nm, 12.7 nm, 12.6 nm, in X, Y, Z respective direction, nearlyλ/50（λ=632.8 nm）.The mechanical dynamic test results verify the structural performance and the capability of vibration resistance .The 1 st order natural frequency of the mirror component is 556.6 Hz.After the test, the surface figure accuracy changs from RMS 0.021λto 0.025λ, not showing obvious changes .The high volume fraction SiC/Al mirror can reach the same design indexes as SiC＆amp;nbsp;mirror and meet the space application requirements .

关 键 词：空间遥感器 空间反射镜 高体份SiC/Al复合材料 有限元分析 

分 类 号：V445.8[航空宇航科学与技术—飞行器设计] TH16[机械工程—机械制造及自动化]