计及金属铰链的环形可展天线热-结构分析

空间热环境对环形可展天线在轨服役稳定性的影响很大,时刻变化着的热环境会造成天线温度的剧烈波动,从而导致天线结构的热变形,使得天线的形面精度恶化,影响天线电信号的传输甚至导致天线失效,因此有必要对天线进行热-结构分析。以环形可展天线为研究对象,考虑天线在轨服务环境中的各类因素(包括空间真空、空间低温、微重力和空间热源等),基于斯忒藩-玻尔兹曼定律和傅里叶热传导理论,利用有限元软件建立计及金属铰链的环形可展天线的热辐射-热传导分析模型,研究了环形可展天线的非均匀温度场;基于弹性热力学理论及有限元理论,建立计及与不计及金属铰链的环形可展天线的热变形分析模型,研究了非均匀温度场对环形可展天线形面精度和张力比的影响规律。研究结果表明:相较于不计及金属铰链的环形可展天线,计及金属铰链的环形可展天线的形面精度和张力比均发生恶化,其中形面精度变化值已达到毫米级。研究结果对同类型环形可展天线的热-结构分析有重要的借鉴意义,可为天线的结构设计提供参考。

Thermal-structural analysis of hoop deployable antenna with metal hinges

The space thermal environment has a great influence on the stability of hoop deployable antenna in orbit. The ever-changing thermal environment will cause the drastic fluctuation in antenna temperature and thermal deformation of the antenna structure, which will worsen the surface accuracy of the antenna, affect the transmission of the antenna electrical signal and even cause the antenna failure. Therefore, it is necessary to perform the thermal-structure analysis on the antenna. Taking the hoop deployable antenna as the research object, considering various factors in the antenna in orbit service environment, such as the space vacuum, space low temperature, microgravity and space heat sources, the thermal radiation-thermal conduction analysis model of hoop deployable antenna with metal hinges was established by using the finite element software based on the Stefan-Boltzmann law and Fourier heat conduction theory, and the non-uniform temperature field of hoop deployable antenna was studied. Based on the elastic thermal mechanics theory and finite element theory, the thermal deformation analysis models of hoop deployable antenna with and without metal hinges were established to study the influence of non-uniform temperature field on the surface accuracy and tension ratio of hoop deployable antenna. The results showed that the surface accuracy and tension ratio of hoop deployable antenna with metal hinges were worse than those of hoop deployable antenna without metal hinges, and the change of surface accuracy had reached millimeter level. The study results have great significance for the same type of thermal-structural analysis of the hoop deployable antenna, and can provide reference for the structure design of antennas.