Thermal-structural Analysis of Hoop Deployable Antenna in Real Orbital Environment
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摘要: 作为卫星与地球信息通讯的重要部件，天线的性能指标将直接影响通信质量。以环形可展天线为对象，计及空间真实在轨环境，基于斯忒藩-玻尔兹曼热辐射、傅里叶热传导理论建立了相应分析模型，研究了其温度场分布情况；进而利用弹性力学及有限元理论，建立了天线热变形分析模型，研究了温度对天线形面精度和张力分布的影响规律。研究表明：在轨非均匀温度场会使环形可展天线形面精度呈现不同程度的恶化；在某些位置会使张力比明显增大，天线张力分布均匀性变差。Abstract: As an important component of satellite in communication with the earth, the performance of antenna directly affects the communication quality. Hoop deployable antenna was the research object. In the real orbital environment of space, the corresponding analysis model was established via Stefan-Boltzman thermal radiation and Fourier thermal conduction theory, and the temperature distribution of the antenna was studied. Then through the elasticity mechanics and the finite element theory, the thermal deformation analysis model was established. The influence of temperature on surface accuracy and tension distribution of antenna was analyzed. The study result shows that the uneven temperature distribution in orbit can make the surface accuracy of hoop deployable antenna worse by different degrees; and the tension ratio is significantly increased in some positions with worse uniformity of antenna tension distribution.
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表 1 天线材料属性
参数名称及单位 碳纤维 KEVLAR 密度/(kg·m-3) 1 600 480 弹性模量/Pa 1.75×1011 5.5×1010 泊松比 0.3 0.3 导热系数/(W·m-1·K-1) 400 168 比热容/(J·kg-1·K-1) 800 136 热膨胀系数/(K-1) 8×10-7 -2×10-6 发射率 0.6 0.4 太阳吸收率 0.81 0.63 
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