空间太阳望远镜主镜支撑结构的优化设计

空间太阳望远镜主镜是有效口径为1m的抛物面镜,工作状态需要达到衍射极限,因此光学系统要求主镜面形误差小于λ/40(RMS),精度主要靠主镜支撑结构来保证。主镜支撑结构应满足地面调试、在轨及发射状态的需要。支撑结构试验样机已经加工完成,地面调试结果表明主镜的镜面变形满足整个光学系统的要求。试验样机强度和刚度还有较大余量,结构本身比较复杂。用有限元分析方法进行优化设计,优化后的主镜支撑结构满足地面调试、在轨及发射状态的需要,也能保证主镜的面形满足整个光学系统的要求,有效减轻仪器重量、简化支撑结构的同时,提高了整个仪器的可靠性。

Optimize and redesign the primary mirror supporting system of space solar telescope

The primary mirror of the space solar telescope (SST) is a paraboloidal mirror with an aperture of 1 m diameter.In order to achieve a spatial resolution of 0.1 arcsec,diffraction-limited imaging must be achieved. The primary mirror supporting system is causing deformations to the primary mirror's surface shape qualification. The surface error should not be over λ/40(rms.),where λis 0.6μm. Therefore,the supporting system is very important to the whole telescope,and it must satisfy the need of on the ground,on the track and during the launching process. The prototype has enough stiffness and intensity,and the structure is very complicated. The redesign is optimized by the Finite Element Method. The new scheme also meets the need of space using and ground alignment conditions. The new structure can assure the surface error to meet with the optical system requirement. The new scheme also reduce the weight,simplify the mechanical structure and increase the reliability of the whole instrument.