Numerical Simulation Study On Characteristics Of Wind Loads Of Huge Radio Telescope

Building of huge movable radio telescope has been one of hot spots in the field ofradio astronomy in China in recent years. Shape fitting precision of reflecting surfacewill be reduced under wind action, as a result that observation performance will beinfluenced. At present, study on wind load characteristics of radio telescope is verylimited at home and abroad. Based on CFD numerical simulation method, wind loadcharacteristics are studied in this paper, and influencing factors are investigated byparameter analysis method. According to the results of numerical simulation, precisionof65m radio telescope is calculated under mean wind load.The thesis mainly includes the following items:1. Wind field of radio telescope spherical protective cover and1.5m paraboloidantenna structure is simulated by adopting several turbulent models, andcomparative analysis is worked out with specification methods and wind tunnelresults. Finally the scheme of numerical simulation of radio telescope based onRSM model is determined.2. On basis of CFD numerical simulation method and RSM turbulent model, wind loadcharacteristics of110m radio telescope are studied, considering influences ofelevation angles and wind directions. Mean wind pressure coefficients and shapecoefficients are given to facilitate engineering applications. Based on analysis offlow’s characteristics of wind field, the most unfavorable mechanical attitude ofradio telescope is predicted.3. Organizing multi-factor and multi-level orthogonal numerical wind tunnel tests,influencing factors of wind load characteristics of radio telescope are investigatedby parameter analysis method, including geometric parameters(caliber:65m,90m,110m; f/D:0.32,0.5; the pitch height:3m,4m,5m), operating parameters (elevationangles:0,30,60,90; wind directions:0,30,60,90,120,150,180) and windenvironment(landform types: B and C; wind velocity:10m/s,20m/s). Relevant lawof influcing factors is given, which provides references for wind resistant design ofhuge radio telescope. 4. Based on the results of CFD numerical simulation, RMS and overall displacementof65m radio telescope are calculated under wind load. The influence of wind loadon the precision of radio telescope is estimated.