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30 m望远镜三镜为长轴3.594 m,短轴2.536 m的椭圆形微晶玻璃反射镜。其支撑结构采用了多种柔性结构,以释放非支撑方向的自由度。使得轴向支承和侧向支撑能够相互解耦,并减小支撑结构与镜子材料的热胀系数不匹配带来的热应力。柔性件柔度越高,在望远镜观测条件的扰动下镜面面形越好。但过高的柔度会降低柔性件的屈曲临界载荷,导致结构发生屈曲失效。为此需要计算出望远镜观测过程中柔性结构所承受的最大压力载荷,计算相应的屈曲安全系数SFBuckling。对比了典型结构非线性屈曲分析和特征值屈曲分析的区别,不断迭代设计和分析,柔性元件的SFBuckling和柔度取得了一个较好的平衡点,热扰动下的面形也达到了设计要求。
30 m telescope three mirror long axis 3.594 m, short axis 2.536 m oval glass mirror. Its support structure uses a variety of flexible structures to free the degree of freedom in the unsupported direction. So that the axial support and the lateral support can be decoupled from each other and reduce the thermal stress caused by the mismatch of the thermal expansion coefficient of the support structure and the mirror material. The higher the flexibility of the flexure, the better the specular shape under the perturbation of the telescope observation conditions. But too high flexibility will reduce the critical load of flexure flexure, resulting in structural buckling failure. To do this, it is necessary to calculate the maximum pressure load on the flexible structure during the telescope observation and calculate the corresponding buckling safety factor SF Buckling. The difference between nonlinear buckling analysis and eigenvalue buckling analysis of typical structures is contrasted. Continuous iterative design and analysis show that SFBuckling and compliance of flexible element achieve a better balance, and the surface shape under thermal disturbance also meets the design requirements.