采用三点定位原理的反射镜支撑结构设计

The support design of reflected mirror from the principle of three points supported

在选择空间反射镜的支撑形式时,大口径反射镜一般采用柔性支撑结构加背板的支撑结构;小尺寸反射镜采用周边支撑的结构,但支撑结构质量都较大。为了降低反射镜支撑结构质量,通过对三点定位原理的自由度分析,设计了3个柔性铰链结构,通过柔性铰链的结构参数分析及有限元分析计算,设计出参数为R=1mm,t=2.5mm的三点柔性铰链,实现400mm口径反射镜的周边支撑,并使支撑反射镜的三个铰链直接与相机机身连接,省略了常规反射镜支撑的背板及边框,大大降低支撑结构质量;且该支撑结构具有较好的动态刚度和力、热环境适应能力。

For the support of space refleeted mirror, flexible link and backboard are often used in big reflected mirror and circumference supported strueture is used in small reflected mirror. Both have a relatively heavy weight. In order to reduce the weight of the supported structure, three flexible links are designed through analyzing the freedom of three points orientation principle. By analysing the parameters of the structure and the computing with finite element method （FEM）, three flexible links with the parameter of R=I mm, t=2.5 mm are designed, which can supports 4400 mm reflected mirror on circumference. The three flexible links are connect directly with the frame of remote sensor so as to elide the backboard and greatly reduce the weight of supported. The dynamic rigidity of the support is fine, and it is well-adjusted to the change of force and heat.