Abstract
In order to design a high stiffness and thermal stability 1.2m class space mirror, materials selection, lightweight and the support structure are taken into account in this study. By combining the excellent intrinsic thermo-mechanical properties, silicon carbide (SiC) is chosen as the material of the primary mirror and a new design with sandwich structure was proposed. Through adjusting the parameters of flexures, high stiffness and thermal environment adaptability are ensured. Detailed finite element analysis (FEA) is performed via a MSC/NASTRAN finite element model. Analysis results indicate that the surface figure reaches to 13.6nm rms under gravity and temperature effect, and the fundamental frequency is 130Hz. It can satisfy the system requirements of high stiffness and thermal stability.
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