球面主反射镜基体形状选择

Selection of Substratum Shapes of Spherical Primary Reflection Mirrors

分析指出重量和变形两项技术要求不能直接衡量主反射镜性能，采用有限元法计算了双拱、双凹、弯月和平背四种形状主反对镜的自振频率，并通过它来衡量主反射镜的动态刚度，以寻求重量轻、变形小的主反射镜基体形状。

It’s pointed out that the performances of primary reflection mirrors couldn’t be provedby their mass or deformation,It’s supposed for them to be lightweight and little deformed while under loads.Natural frequencies of mirrors in some shapes,double-arch,double-concave,Single-arch and plain-rear,are calculated in Finite Element Method,which areused to determine if the mirrors meet their structural stiffness.