对大射电望远镜50 m缩比模型的索驱动馈源支撑系统三级结构及参数进行优化设计。考虑到馈源支撑系统的天顶角指标从40°增加到60°的技术要求，改变二级模型结构，提出了三级索驱动馈源支撑系统结构，由馈源舱，AB轴，Stewart平台三部分构成，为了降低索拉力差，馈源舱的调整角度设计为20°，AB轴调整40°，Stewart平台调整定位精度。对馈源舱，AB轴的结构参数做了优化设计。并依优化结果，制造了新的三级索驱动馈源支撑系统的50 m缩比模型进行测试验证。
A structural parameter optimization and simulation of a three-level cable-driven feed structure (CFS) for 50 m model of the large spherical radio telescope is presented. Considering the requirement of the orientation of the CFS increased to 60° from 40°, a novel design of the three-level CFS is performed. Aiming at the drawback of tension difference of the CFS, a method to optimize the tension difference of cables, and the structure of AB axis in CFS is proposed. Simulations had been developed combining with the 50 m FAST model, which demonstrate the effectiveness and feasibility of the proposed three-level feed cable-driven structure.
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