遥感仪器光学系统用非球面反射镜的支撑结构设计

Design of Support for Aspheric Mirror Used in Remote Sensor

目前空间遥感仪器的非球面反射镜一般都是用支撑柔性结构加背板的支撑结构支撑的。由于支撑结构的质量占有较大比重,需要简化支撑结构的形式,降低支撑结构的质量。依据三点定位原理和双脚架挠性结构,设计了3个用于简化反射镜支撑结构形式的柔性铰链结构,并采用有限元软件对设计结果进行了分析。结果表明,这种支撑结构形式可以适应空间力热环境并能达到精度要求,实现了对大口径非球面反射镜的支撑。该支撑结构去除了传统结构中的反射镜背板,简化了支撑结构的形式,减小了支撑结构的质量,降低了组件加工和装配工艺的难度。

Currently, the aspheric mirrors used in space remote sensors are generally supported with a supporting structure containing a flexible link and a backboard. Because the supporting structure accounts for a large proportion in weight, its configuration and weight should be simplified and reduced respectively. According to the principle of three-point orientation and bipod flexure, three flexible link structures for simplifying the configuration of the support are designed. The design result is analyzed by using a finite element software. The result shows that this support configuration is able to adapt the mechanical and thermal environment in space. It can meet the required precision and can be used to support large diameter aspheric mirrors. Because the mirror backboard commonly used in the traditional configuration is removed, this support configuration is simplified. Its weight is reduced and its machining and assembling difficulties are also reduced.