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根据极轴式望远镜的工作特点,以口径为700 mm的极轴式望远镜主镜室系统为例,确定了一套主镜支撑方案。借助于有限元分析软件MSC.Patran详细地建立了系统的有限元模型,选取多种工况,分析了系统在自重作用下的镜面变形情况,绘制了镜面变形误差PV值和RMS值的变化曲线。结果表明:镜面变形主要受α角的影响,随着α的增大而减小,径向支撑效果优于轴向支撑效果,镜面变形误差满足设计指标要求。在主镜室系统竖直放置时,利用Zygo干涉仪测得带支撑结构的镜面变形误差RMS值为28.48 nm,表明主镜在该支撑结构作用下的面形接近于加工检测时的状态,同时也验证了有限元模型的准确性。
According to the working characteristics of polar telescope, taking a 700 mm diameter polar telescope main mirror system as an example, a set of main mirror support scheme has been established. With finite element analysis software MSC.Patran established in detail the finite element model of the system, select a variety of conditions, analysis of the system under the weight of the mirror deformation under the condition of the mirror deformation error PV and RMS values of the curve . The results show that the mirror deformation is mainly affected by α angle, which decreases with the increase of α. The radial support effect is better than the axial support effect. The mirror deformation error meets the design requirements. When the main mirror system is placed vertically, the RMS value of the mirror deformation error of the belt-supported structure measured by the Zygo interferometer is 28.48 nm, indicating that the shape of the main mirror under the supporting structure is close to that at the time of processing inspection, meanwhile, Also verified the accuracy of the finite element model.