CAJ | 학술논문

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1.5 m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62 Hz；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。
비구면차경상대우주경적위치화은정성대광관적검측화교험성능기착비상중요적작용。종원리상분석료차경지탱계통，동시건립개진적지탱항가동역학모형；연후，사용강유처리적방법통과유한원분석대결구진행우화설계；최후，분석온도변화대1.5 m광관성능적영향。결과표명，채용적절향삼익지탱결구，감소료계통적차란비이차보증료결구적강도，개진항가적비강도득도개선，종이사정개지탱계통적일계해진체도62 Hz；개변국부결구재료강저료온도변화대광학계통적영향，사파상차유λ/20감소위λ/30。제출적설계방안정도고，은정성호，가이만족설계요구。
The relative position and stability between primary mirror and aspherical secondary mirror (SM for short) is important to test and checkout for the collimator. First, the supporting system of secondary mirror was analyzed according to the theory, and the dynamics model of supporting trusses was built. Then, the secondary supporting system was designed, optimized according to the disposal of decreasing dimension by FEA. Finally, effects caused by temperature were analyzed. The results show that tangential spider van support could reduce the masking and keep the stiffness at the same time. The ratio of rigidity of the improved supporting truss is uprated, which make the 1st resonance of the whole system arrive at 62 Hz. The effect of temperature also can be decreased by change material of local structures, making the wavefront error of system change from λ/20 to λ/30. The scheme has fine accuracy, well stability and meet the design requirement.