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利用ANSYS热分析模块分别对天线主副反射面板结构和天线的杆系结构建立有限元模型,计算夏季7月15日晴天无云这一最不利气候之一的天气各时刻的空气对流换热、太阳辐射、环境长波辐射换热以及阴影遮挡等各种边界条件,研究分析了主面板、副面板在日照作用下的温度场分布,特别是由于主面板反射太阳辐射热量并聚焦于副面板从而使副面板温度剧增的“太阳灶”现象;同时为获取天线结构在日照下指向误差变化规律,还对天线杆系结构进行了日照非均匀热变形分析,给出日照下主反射面型面精度随时间的变化规律。结果表明:主副面板之间存在的“太阳灶”效应使的副面板最高温度达135℃,由于日照非均匀温度场的作用,杆系结构中最大温差达到10.8℃。太阳照射引起的阴阳面造成主反射面不均匀热变形,在俯仰角90°工况下导致RMS(反射面表面各点误差平方和均方根)最大增加0.35mm。这些数据为下一步结构的施工、传感器的布设以及局部温度控制措施提供了参考信息。
ANSYS thermal analysis module is used to establish the finite element model of the antenna primary and secondary reflector panel structures and the antenna rod structures respectively. The air convection heat transfer at various times of the summer, July 15, Solar radiation, ambient long-wave radiation heat exchange and shadow shading and other various boundary conditions. The temperature field distribution of the main panel and the sub-panel under sunlight is studied, especially since the main panel reflects the solar radiation heat and focuses on the sub-panel In addition, in order to obtain the change rule of pointing error of antenna structure under sunshine, the structure of antenna mast was also analyzed by inhomogeneous thermal deformation, and the main reflection surface type Surface accuracy changes with time. The results show that the maximum temperature of the sub-panel which is located between the main panel and the sub panel is 135 ℃. Due to the inhomogeneous temperature field, the maximum temperature difference in the bar structure reaches 10.8 ℃. The yin and yang surface caused by solar radiation causes uneven thermal deformation of the main reflecting surface, resulting in a maximum RMS 0.35 mm (RMSE) of the square root of the square of the error at each point of the reflecting surface at a pitch angle of 90 °. These data provide reference information for the construction of the next structure, sensor deployment and local temperature control measures.