中文摘要：

FAST工程采用柔索悬吊方案，利用六根支撑索拖动30t重的馈源舱在百米尺度空间内运动，并将馈源瞬时定位于毫米级精度位置。因此，馈源舱的主要执行机构一Stewart平台必须克服制造误差、刚度变形、测量误差以及外界扰动耦合的影响，实现馈源的定位精度要求。本文分析了Stewart平台的结构、机构、工作原理及误差来源，针对前期的精度标定提出了测量及误差补偿方案，研究内容对于FAST工程大科学目标的顺利实现具有重要的指导意义。

英文摘要：

Flexible cable-suspended mechanism is adopted in the FAST telescope, 30-DWT feed cabin supported by 6 cables was moved in 100-meter space, simultaneously millimeter scale feed position determining accuracy can be obtained. Therefore, Stewart Platform which was used for main actuator mechanism of feed cabin, must overcome the coupled influence of manufacturing error, rigidity deformation, measurement error and external disturbances, and satisfy the requirement of feed position determining accuracy. The structural, mechanism, operating principle and error sources for Stewart platform was analyzed, also the measurement and error