中文摘要：

FAST大射电望远镜以中科院国家天文台为研制总体，其Stewart平台作为馈源舱内部接收机平台的精调机构，用于减少和抑制整个馈源舱的风激扰动影响，并对馈源运动轨迹进行精调定位。基于目前馈源舱系统的设计输入，完成了Stewart平台的构型选择和参数确定，进而分别从下平台、上平台和伸缩支杆三方面进行Stewart平台的详细结构设计。在结构设计的基础上，利用有限元分析软件ANSYS分别对下平台、上平台和伸缩支杆进行了力学分析。结果表明，该Stewart平台满足设计需求。

英文摘要：

Large radio telescope FAST has National Astronomical Observatory of Chinese Academy of Sciences as overall development, its Stewart platform is the fine level adjusting mechanism of interior receiver platform in feed cabin, and is used to reduce the wind excitation disturbance of the feed cabin and to adjust precisely the position of the motion trajectory of the feed cabin. Based on the design input of current feed cabin system, the structure configuration selection and the parameter determination of the Stewart platform are completed. Then, the detailed structure design of the Stewart platform is carried out from the three aspects of bottom plat- form, top platform and telescopic strut. Based on the detailed structure design, the mechanical analysis for the bottom platform, the top platform and the telescopic strut are performed using finite element analysis software ANSYS. Analysis results indicate that the Stewart platform meets the design requirements.