大型射电望远镜天线副反射面调整系统设计与实验研究

摘要

To deal with the changes in the antenna performance caused by the gravitational deforma-tion and antenna pointing and to satisfy the work requirements of the L-band feed in the large radio telescope,the configuration of the antenna Sub-Reflector Adjustment Mechanism of the“Shanghai 65 m radio telescope system” was determined based on the multi-DOF adjustment requirements and the workspace requirements.On the basis of meeting the task requirements, the configuration size pa-rameter of the mechanism was optimized and the structure design was carried out after each dimen-sion was determined.In addition, the calibration experiment of the Sub-Reflector Adjustment Mech-anism was carried out and the dynamic tracking accuracy of the measurement experiments of the Sub-Reflector Adjustment Mechanism was conducted.The results showed that all the design requirements were met.Due to the real engineering task oriented design and experimental studies, the research results can serve as an important guidance for the application of the parallel mechanism in the engi-neering practice.%为满足大型射电望远镜天线运动过程中由于重力变形而引起的天线性能和指向的变化以及L频段馈源工作任务，根据多自由度调整以及工作空间范围等设计要求确定了“上海65米射电望远镜系统”天线副反射面调整机构的构型；在满足天线工作任务要求的基础上，对机构进行了构型尺寸参数优化，并在各个尺寸参数优化确定后对天线副面调整机构进行了结构设计；对天线副面调整机构进行了标定实验，并开展了副面调整机构动态跟踪精度测量实验研究，实验结果均达到了设计要求。面向工程实际任务进行设计与实验研究，研究成果对并联机构真正应用于工程实践具有重要的指导意义。