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针对地平式望远镜消旋K镜系统中子反射镜支撑问题,设计了一种三点底支撑及芯轴侧支撑的联合支撑方法,并对该支撑结构展开了深入的仿真分析与实验研究。根据圆形反射镜径厚比与反射镜自重变形的关系,确定了反射镜的厚度。根据反射镜运动学安装原理,设计了柔性底支撑加芯轴侧支撑的结构,芯轴侧支撑环具有柔性切槽,柔性环节确保底支撑与侧支撑应力互不干涉。通过有限元软件Ansys建立反射镜参数化模型,优化了三点底支撑及侧支撑粘结位置,并且分析了反射镜支撑面形精度。进行了反射镜粘接实验,搭建了反射镜面形检测实验平台,进行了反射镜支撑面形精度检测实验。实验结果表明:反射镜面形精度均方根(RMS)值为12 nm、峰谷值(PV)为76 nm,接近仿真分析结果。实验结果验证了消旋K镜反射镜的支撑结构具有正确性与可行性,并满足系统设计要求。
In order to solve the neutron mirror support problem of the erecting K-mirror system of the geostationary telescope, a joint support method of three-point bottom support and mandrel-side support is designed. In-depth simulation analysis and experimental research of the support structure are carried out. According to the relationship between the diameter-thickness ratio of the circular mirror and the self-weight of the mirror, the thickness of the mirror is determined. According to the installation principle of mirror kinematics, the structure of flexible bottom support and mandrel side support is designed. The mandrel side support ring has a flexible notch, and the flexible link ensures that the bottom support and the side support stress do not interfere with each other. The finite element software Ansys was used to establish the parametric model of the reflector, the three bottom support and the side support were optimized, and the precision of the reflector support surface shape was analyzed. A mirror bonding experiment was carried out, and a mirror surface shape testing experimental platform was set up, and the testing precision of the mirror support surface shape was tested. The experimental results show that the RMS value of mirror surface shape is 12 nm and the peak-valley value (PV) is 76 nm, which is close to the result of simulation analysis. The experimental results verify the correctness and feasibility of the supporting structure of the dechirped K-mirror and meet the system design requirements.