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《中国天文和天体物理学报(英文版)》 2003-05
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A Study of the Fitting Accuracy of the Active Reflector for a Large Spherical Radio Telescope

Xiao-Qiang Tang, Jin-Song Wang and Qi-Ming Wang 1 Department of Precision Instruments, Tsinghua University, Beijing, 100084; 2 National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012  
We propose a spatial three-degree-of-freedom (DOF) parallel mechanism combining two degrees of rotations and one degree of translation to support the active reflector units of a large spherical radio telescope. The kinematics, workspace and accuracy of the mechanism are analyzed. One-dimensional and two-dimensional fitting errors to the working region of active reflector are investigated. Dimensional parameters of the mechanism and active reflector unit are examined with respect to the requirement of fitting accuracy. The result of accuracy analysis shows the effectiveness and feasibility of the proposed mechanism, and gives a design rule to guarantee the highest working frequency required by large radio telescope.
【Fund】: Supported by the National Natural Science Foundation of China
【CateGory Index】: P111.44
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