Reflector wind load characteristics of the large all-movable antenna and its effect on reflector surface precision

The wind load could cause the deformation of the reflector surface, seriously affect the resolution and the sensitivity of the antenna and degrade its performance. So the analysis of the wind characteristics of the reflector surface is particularly important. For one thing, the wind loads acting on an open parabolic reflector, as a commonly used type of reflector (F/D=0.3), are obtained by the wind tunnel test and CFD technique and wind characters of the parabolic reflector are revealed. Wind-induced dynamic behaviors under different upwind profiles are also analyzed by the finite element method (FEM). After that based on the numerical simulation, a large number of different kinds of reflectors are researched and analyzed and the results for different diameters, focal length to diameter ratios are acquired to provide sufficient information for wind force proofing design of the antenna structures. Finally, taking the established 110m antenna structure as the example and based on the instantaneous pressures derived from the wind tunnel tests, the mechanic performances of the structure at the survival wind speed and working speed are respectively investigated, and consequently the reliability of its mechanic performance is evaluated. The surface RMS of structural responses under various wind loads conditions and internal mechanisms are finally discussed to provide valuable data for the deformation control of the actuators in further work.