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工程设计学报
Chinese Journal of Engineering Design  2024, Vol. 31 Issue (1): 98-106    DOI: 10.3785/j.issn.1006-754X.2024.03.308
Industrial Software and Major Equipment Integrated Design     
Analysis of beam pointing of large aperture reflector antenna under ambient wind load
Tian LUAN1(),Song XUE1,2(),Peiyuan LIAN1,2,Jiaheng YU1,Yuxuan DU1,Meng WANG3,Wulin ZHAO4,Bo LU5,Qian XU6,Congsi WANG2
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
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Abstract  

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.

Key words： reflector antenna      wind load      wind pressure coefficient      flexible deformation      beam pointing characteristic     
Received: 20 October 2023      Published: 04 March 2024
CLC:  TH 751  
Corresponding Authors: Song XUE     E-mail: luan_tian0@163.com;sxue@xidian.edu.cn
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Tian LUAN
Song XUE
Peiyuan LIAN
Jiaheng YU
Yuxuan DU
Meng WANG
Wulin ZHAO
Bo LU
Qian XU
Congsi WANG
Cite this article:

Tian LUAN,Song XUE,Peiyuan LIAN,Jiaheng YU,Yuxuan DU,Meng WANG,Wulin ZHAO,Bo LU,Qian XU,Congsi WANG. Analysis of beam pointing of large aperture reflector antenna under ambient wind load. Chinese Journal of Engineering Design, 2024, 31(1): 98-106.

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https://www.zjujournals.com/gcsjxb/10.3785/j.issn.1006-754X.2024.03.308     OR     https://www.zjujournals.com/gcsjxb/Y2024/V31/I1/98


环境风载荷下大口径反射面天线波束指向分析

大口径反射面天线是深空探测、卫星通信的关键设备。为了不断提高观测性能，天线口径不断增大，进而对天线指向精度的要求越来越高。随着天线口径的增大，天线的刚度降低、迎风面积增大，这会导致天线的柔性变形严重，性能难以保证。为探究环境风载荷下大口径反射面天线的柔性变形对电性能的影响，提出了一种天线波束指向分析模型。首先，利用计算流体力学方法对天线表面的风压分布情况进行了数值模拟，得到了天线表面的风压系数。然后，利用风压系数与风速无关的特性，分析了不同风速工况下天线结构变形的规律。最后，根据天线结构变形的特点，分析了天线在不同工作状态下的增益损失、指向偏差等的变化规律。结果表明，所提出的模型可以快速评估大口径反射面天线在风载荷下的变形情况和波束指向特性，这为后续的天线抗风结构设计与系统控制研究提供了理论指导。


关键词： 反射面天线,  风载荷,  风压系数,  柔性变形,  波束指向特性 
Fig.1 CFD numerical simulation process
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 1 Wind 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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