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非球面次镜相对于主镜的位置和稳定性对光管的检测和校验性能起着非常重要的作用。从原理上分析了次镜支撑系统,同时建立改进的支撑桁架动力学模型;然后,使用降维处理的方法通过有限元分析对结构进行优化设计;最后,分析温度变化对1.5m光管性能的影响。结果表明,采用的切向三翼支撑结构,减小了系统的遮拦比而且保证了结构的刚度,改进桁架的比刚度得到改善,从而使整个支撑系统的一阶谐振达到62Hz;改变局部结构材料降低了温度变化对光学系统的影响,使波像差由λ/20减小为λ/30。提出的设计方案精度高,稳定性好,可以满足设计要求。
The position and stability of the aspherical secondary mirror relative to the primary mirror play a very important role in the detection and verification of the light pipe. The secondary mirror support system is analyzed in principle, and an improved support truss dynamic model is established. Then, the structure is optimized by using the method of dimensionality reduction through finite element analysis. Finally, the effect of temperature variation on the performance of 1.5m light pipe influences. The results show that the tangential three-wing support structure reduces the obscuration ratio of the system and ensures the rigidity of the structure, improves the specific stiffness of the truss, so that the first-order resonance of the whole supporting system reaches 62 Hz; The influence of the temperature change on the optical system is reduced so that the wave aberration is reduced from λ / 20 to λ / 30. The proposed design has high precision and good stability, which can meet the design requirements.