Lightweight design of high volume SiC/Al composite mirror for remote camera

For the design of mirrors in the use of remote camera, high stiffness and less mass are the most critical facts. In this paper, SiC/Al composite material was selected as the material of the mirror. The precise constrains with six degree of freedom was adopted for optimizing the mirror in the diameter of Φ400mm. Traditional empirical design method was used to determine the initial shape parameters of the mirror. The RMS value of the surface shape error and mass were set as the goal of optimization. The Pareto front of the multi-objective parameters was obtained and the objective function was processed to determine the optimal design of the mirror. The results show that the mirror after optimization achieved better performance. Compared with mirror designed with experience-basedmethod, the lightweight ratio of the mirror is increased by 9.1%. The mass is reduced by 12.9% compared with the mirror in the material of SiC. The optimized design method and results of the mirror in this paper can provide a reference for the application of mirrors of the high volume fraction SiC/Al composite material.