Technology Research of Stewart Platform in Large Radio Telescope Feed Cabin

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 platform, 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.