大口径SiC反射镜组件研制技术

Design and Fabrication Technology of Large Aperture SiC Mirror Assembly

目前大口径SiC反射镜组件的研制是当前轻小型化相机研制中亟待解决的关键技术之一。针对该类反射镜的研制特点,本文以某轻型相机大口径SiC反射镜组件的工程研制为例,从方案设计、力学样机设计与分析及地面试验三方面,系统地阐述了大口径SiC反射镜组件进行合理、高效、高可靠性设计的主要研制技术路线。有关试验结果表明,SiC反射镜组件一阶频率保持在340Hz左右,与有限元分析结果相差约8.5%;振动试验前后反射镜面形RMS相差为0.009λ,该结构满足使用要求。该反射镜组件研制技术路线完全适用于其它大口径反射镜组件的工程研制,并可有效提高结构的稳定性,缩短研制周期。

Now the design and fabrication technology of large aperture SiC mirror assembly is the key point during the process of lightweight of the camera.The design process of a large aperture SiC mirror assembly is shown,which is the key structure of a lightweight camera,and a main flowchart of design techniques of a highly reliable,efficient and reasonable large aperture mirror assembly is given from the aspects of the principle prototype design,dynamic prototype design and ground test.Experimental results indicate that the 1st natural frequency of the SiC mirror assembly is 340Hz.There is 8.5% difference between the Finite Element Analysis（FEM） analysis results and the experimental results.At the same time,the difference of the mirror synthesis face figure error RMS was 0.009λ before and after the vibration experiment.All the experimental results show that the SiC mirror assembly satisfies the requirements of lightweight camera very well.Moreover,the design technology flowchart of the SiC mirror assembly is adaptive to the other large aperture mirror assembly design process.The result shows that it is a good method to improve the reliability of the large aperture mirror assembly and shorten the development periods.