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大口径轻质反射镜采用柔性支撑结构可以降低外界力载荷、惯性载荷及热载荷的负作用,从而保证光学系统的成像质量。为消除加工、检测与系统装调过程的定位误差,研究了应用于计算机控制能动磨盘加工(CCAL)技术抛光的柔性限位支撑模型。利用有限元分析软件(Ansys),分析φ1.8m轻质镜采用柔性限位支撑时,CCAL技术抛光引起轻质镜的最大倾斜量、最大主应力以及主镜面变化范围,对支撑盘的口径及位置进行了优化设计,模拟仿真18点弹簧在不同压缩量下的镜面变形。仿真分析结果表明,柔性限位支撑的结构刚度、轻质镜底板倾斜量满足能动磨盘加工条件,最大主应力强度远小于主镜的许用应力,主镜面变形符合加工要求。
Large diameter lightweight reflector with flexible support structure can reduce the external force load, inertial load and thermal load of the negative effect, so as to ensure the optical system imaging quality. In order to eliminate the positioning errors of machining, testing and system setup, the flexible limit support model applied to the computer-controlled active disc polishing (CCAL) technique was studied. By using the finite element analysis software (Ansys), the maximum tilt of the light mirror, the maximum principal stress and the variation range of the main mirror caused by the CCAL technique polishing when the φ1.8m lightweight mirror is supported by the flexible limiter are analyzed. The location has been optimized design, simulation 18 point spring in different compression amount of mirror deformation. The simulation results show that the structural rigidity of the flexible limit support and the inclination of the lightweight mirror base satisfy the working conditions of the active disc, the maximum principal stress intensity is far less than the allowable stress of the primary mirror, and the deformation of the primary mirror meets the machining requirements.