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Overall Design and Optimization of FAST Back-Structure

Author: ZuoChun
Tutor: FanFeng
School: Harbin Institute of Technology
Course: Structural Engineering
Keywords: FAST Back frame structure Conformal Model test Node
CLC: TU399
Type: Master's thesis
Year: 2007
Downloads: 54
Quote: 1
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Abstract


To promote the further development of astronomy , to improve China 's deep-space probe ability , to participate actively in international competition and cooperation , our country will be in Guizhou construction of the world's largest radio astronomy telescope - 500m -diameter giant radio astronomical telescope FAST ( 'em Five - hundred - meter Aperture Spherical radio Telescope ) , and in 1994 began the pre-research work , one of its innovative point of the main reflector , spherical real-time within the 300m -diameter range work fitted parabolic . For such a giant telescope , the reflecting surface supporting system is undoubtedly one of the key factors for the smooth implementation of the project . Currently, the tensioned cable network overall program has been identified as the embodiment of the structure of the FAST reflecting surface support . As a transitional link between the main cable network with the panel , the back frame structure is an important part of the tension cable network reflector support system , its performance directly affects the accuracy and cost of the entire system . Therefore , it is necessary to expand the back frame structure a comprehensive and detailed study to select the optimal structure of the program . A detailed analysis of the structure of the backrest and construction program . Firstly combined with FAST on the precision requirements of the reflecting surface ( root mean square displacement deviation is less than 2mm ) , FAST reflecting surface back frame structure design method of conformal and selected two structures conformal and non-conformal Comparison of design . Secondly, the back frame structure of the reflecting surface of FAST Selection and Optimization of space grid structure ( single-layer mesh structure , double grid structure and partial double layer grid structure ) , the suspen structure ( single layer suspen structure and partial double - layer mesh string support structure ), mixed structure brace the structure of possible structural forms, and each structure a detailed parametric analysis , its performance with different the variation of the parameter , proposed several optimal structure, provides detailed information on the back frame structure for future testing and design . Finally, the preliminary design of the full-size model test on the back frame structure , its main contents include back frame structure test stand, back frame structure , special nodes to provide a reference for the actual design of the back frame structure .

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