大口径离轴反射镜四点热锁辅助支撑设计与验证

针对大口径离轴反射镜组件高面形精度、高可靠性和高稳定性支撑的要求，设计了一种中心筒支撑配合四点可自由加、解热锁辅助支撑的离轴反射镜新型复合支撑方案，热锁部件在力学试验和发射过程中锁紧，地面测试及在轨时释放，在保证面形的同时，有效提升了反射镜组件基频及抗力学性能，并在某空间遥感器706 mm×560 mm口径离轴反射镜组件研制中进行了验证，结果表明采用四点热锁辅助支撑的反射镜组件在加锁后动态性能优良，满足基频大于120 Hz、静载30 g条件下胶应力≤3 MPa的要求，且加锁前及解锁后面形均满足RMS优于λ/40 （λ=632.8 nm）的要求，验证了该设计的有效性。

Design and verification of four auxiliary support points by heat lock for large aperture off-axis mirror

Aiming at the requirements of high surface accuracy, high reliability and high stability of large aperture off-axis mirror assembly, a new type of composite support scheme for off-axis mirror was designed, which was supported by central cylinder and four points that could lock or unlock freely. The heat locking parts were locked during mechanical test and launching, released during ground test and on orbit. It could effectively improve the fundamental frequency and the ability to resist vibration, while ensuring the surface quality. In the end, the design was verified in the development of 706 mm×560 mm off-axis mirror assembly of a space remote sensor. The results show that the dynamic performance of the mirror assembly is very excellent when the four auxiliary support points is locking, that can meet the requirements of adhesive stress ≤3 MPa when the fundamental frequency is greater than 120 Hz and the static load is greater than 30 g, and the RMS of the surface of the mirror is better than λ/40 （λ=632.8 nm） when the four auxiliary support points locked or unlocked. The support design is reasonable and effective.