红外与激光工程, 2015, 44 (11): 3358, 网络出版: 2016-01-26  

4 m口径的SiC主镜翻转装置结构设计与分析

Design and analysis of 4 m SiC primary mirror turning device structure
作者单位
中国科学院长春光学精密机械与物理研究所,吉林 长春 130033
摘要
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。
Abstract
The primary mirror turning device was designed to achieve the 180° revolution according to the special operating requirements of the 4 m SiC primary mirror. Firstly, it was determined that the turning device consisted of main body frame, axial supports and radial supports et al. The axial Whiffle-tree support force and the radial strap force was theoretically analyzed when the primary mirror was in different zenith angles and the strap radial pressure was analyzed when the primary mirror was supported by the strap. Secondary, when the practical structure was designed, the finite element model was built and the rigidity of the main body frame was analyzed, and the mirror′s maximum stresses and the turning device′s maximum displacements were emphatically studied when the mirror axis was vertical and horizontal. The detailed structure of the whole turning device was designed. Finally, the turning device was machined and assembled according to the designed and analyzed results, and the mirror′s impact status was measured when the mirror was turning based on the accelerometer′s test. The practical application and the test result indicate that the design requirement of the turning device is achieved, and the direction for similar structure is provided here.

孙敬伟, 吴小霞, 陈宝刚, 李剑锋. 4 m口径的SiC主镜翻转装置结构设计与分析[J]. 红外与激光工程, 2015, 44(11): 3358. Sun Jingwei, Wu Xiaoxia, Chen Baogang, Li Jianfeng. Design and analysis of 4 m SiC primary mirror turning device structure[J]. Infrared and Laser Engineering, 2015, 44(11): 3358.

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