扫描反射镜的支撑与面型精度的静力学分析  

Statics Analysis of the Plane Precision with Supporting Structure of Scanning Mirror

作　　者：王俊善[1,2] 翟林培[1] 丁亚林[1] 肖占全[1,2] 

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 [2]中国科学院研究生院,北京100039

出　　处：《计算机仿真》2008年第11期80-83,共4页Computer Simulation

基　　金：国防预研基金资助项目(ZJ99130B)

摘　　要：航空相机的扫描反射镜在自重和温度变化条件下,会产生反射镜支撑结构和反射面的应力变形,必须对结构作受力分析。利用MSC/Nastran,MSC/Patran有限元分析软件,首先建立了反射镜支撑结构的有限元分析模型,并在此模型的基础上对比分析了刚性支撑和柔性支撑的面型精度,结果表明柔性支撑明显减小了反射镜的变形,达到了面型精度;最后分析了反射镜在固定空间位置时随温度的变形,以及在不同空间位置时,随温度的变化和在自重条件下的面型变化,分析得出:在扫描反射镜不同的工况中,反射镜均满足面型要求。以上分析表明,此反射镜的柔性支撑结构的设计,消除或减小了反射镜内的应力和变形,达到反射镜面型的变化不能大于[PV]=63nm的预期目标。The scanning mirror of aerial camera would be distorted under the conditions of inertial load and temperature change, so the stress must be analyzed. By using finite element analysis software - MSC/Nastran, MSC/Patran, the paper created a model of scanning mirror supporting structrue, analysed the differences of the plane precision beween regid and flexible supporting structure, then pointed out that the latter minished the distortion clearly and satisfied the requirement of plane precision. Finally, it analysed the diatortion of the mirror that changed along with the temperature change, etc. The result indicates that the mirror satisfied the requirement of plane precision, when camera worked in different load cases. The above analysis shows that flexible supporting structure eliminated or reduced the stress and distortion in the mirror and reached anticipated goal , of the plane precision, namely not more than [ PV ] = 63nm.

关 键 词：航空相机 扫描反射镜 支撑结构 面型精度 静力分析 

分 类 号：TN942.2[电子电信—信号与信息处理]