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根据4 m口径的SiC主镜特殊的使用要求,设计了一种辅助翻转设备实现其180°旋转。首先确定了翻转装置的主体构成包括主体框架、轴向支撑组件和径向支撑结构等。理论分析了反射镜在任意天顶角状态下轴向Whiffle-tree支撑结构和径向吊带支撑力的大小,并分析了使用吊带支撑下吊带对反射镜径向压力的大小。接着在设计实际结构的同时,运用有限元建模、重点分析了主体框架的刚度以及光轴竖直和光轴水平状态下镜子的应力情况以及翻转装置的最大刚体位移,根据分析结果设计了整个翻转装置的详细结构。最后根据设计和分析的结果,加工、安装了翻转装置,并采用加速度计测量了翻转过程对反射镜的冲击情况。实际应用和测试结果表明,翻转装置达到了设计要求,可以为类似的结构设计一定的指导。
According to the special requirements of 4 m-diameter SiC primary mirror, an auxiliary flip device is designed to achieve 180 ° rotation. First of all, it is determined that the main body of the turnover device includes a main body frame, an axial support assembly, a radial support structure, and the like. The size of the axial Whiffle-tree support structure and the radial support force of the mirror in the arbitrary zenith angle state are analyzed theoretically. The radial pressure of the mirror supported by the suspender is analyzed. Then, while designing the actual structure, the finite element modeling is used to analyze the stiffness of the main frame and the stress of the mirror under the vertical and optical axis of the optical axis and the maximum rigid body displacement of the turning device. According to the analysis results, The detailed structure of the device. Finally, according to the results of the design and analysis, the flip device is processed and installed, and the impact of the flip process on the mirror is measured by using an accelerometer. Practical application and test results show that the turnover device meets the design requirements and can provide some guidance for similar structures.