1.School of Mechano-Electronic Engineering, Xidian University, Xi'an 710071, China 2.Guangzhou Institute of Technology, Xidian University, Guangzhou 510555, China 3.Shaanxi Huanghe Group Co. , Ltd. , Xi'an 710043, China 4.The 39th Research Institute, China Electronics Technology Group Corporation, Xi'an 710065, China 5.Hubei Ezhou Tianyuan Grinding Wheel Co. , Ltd. , Ezhou 436001, China 6.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, China
Large aperture reflector antenna is the key equipment for deep space exploration and satellite communication. In order to continuously improve the observation performance, the antenna aperture is increasing, and the antenna pointing accuracy requirements are higher and higher. With the increase of antenna aperture, the stiffness of antenna decreases while the windward area increases, which leads to serious flexible deformation of antenna and difficult to guarantee its performance. In order to investigate the influence of flexible deformation of large aperture reflector antenna on electrical performance under ambient wind load, a beam pointing analysis model for antenna is proposed. Firstly, the computational fluid dynamics method was used to numerically simulate the wind pressure distribution on the antenna surface, and the wind pressure coefficient of the antenna surface was obtained. Then, the deformation law of the antenna structure under different wind speed conditions was analyzed by using the independent characteristic of wind pressure coefficient and wind speed. Finally, according to the deformation characteristics of the antenna structure, the variation patterns of gain loss and pointing deviation of the antenna under different working states were analyzed. The results show that the proposed model can quickly evaluate the deformation and beam pointing characteristics of large aperture antennas under wind load, which provides theoretical guidance for the subsequent wind-resistant structure design and system control study of antennas.
Fig.2 Computational domain model of large aperture reflector antenna
俯仰角
反射面正面
反射面背面
5°
15°
30°
45°
60°
75°
90°
Table 1Wind pressure coefficient on antenna reflector surface under different pitch angles
Fig.3 Variation trend of wind pressure coefficient on antenna reflector panel surface with pitch angles
Fig.4 Approximate calculation of average wind pressure coefficient for antenna reflector surface
Fig.5 Deformation of antenna reflector under different pitch angles
Fig.6 Extreme value of deformation of antenna reflector under different pitch angles
Fig.7 RMSE of antenna reflector deformation under different wind speeds and pitch angles
Fig.8 Analysis process for beam pointing of large aperture reflector antennas
Fig.9 Directional pattern of antenna at 6m/s wind speed
Fig.10 Gain loss of antenna at 6 m/s wind speed
Fig.11 Variation of the first sublobe level of antenna at 6 m/s wind speed
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