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通过对南山站太阳照射情况的研究,借助有限元分析软件得到天线座架在太阳照射作用下的瞬态温度场分布和热变形情况。建立天线有限元模型,计算在夏至日晴天无云情况下天线受太阳辐射、空气对流和周围环境长波辐射等边界条件下天线座架在不同时刻的热流密度曲线及温度分布;并对温度场分析结果与座架结构做热-结构耦合分析,得到天线座架的热变形分布。结果表明:在太阳照射作用下,不同时刻座架结构中各条梁的温度变化较大;同一时刻不同的梁的温度分布也有明显差异,最大温差可达9℃;热变形量的RMS最大可达1.8 mm,严重的影响到天线的指向。
Through the research on the solar radiation of Nanshan Station, the transient temperature field distribution and thermal deformation of the antenna mount under the action of solar radiation are obtained by using the finite element analysis software. The finite element model of the antenna was established to calculate the heat flux density curve and the temperature distribution of the antenna mount at different time under the condition of cloudless daylight-solitude and solar radiation, air convection and long-wave radiation in the surrounding environment during summer solstice. In addition, The results are compared with the frame structure to do the thermo-structure coupling analysis, and the thermal deformation distribution of the antenna frame is obtained. The results show that under the action of solar radiation, the temperature of each beam in the frame structure changes greatly at different times. The temperature distribution of different beams at the same time also has obvious difference, the maximum temperature difference can reach 9 ℃, and the maximum RMS of thermal deformation Up to 1.8 mm, seriously affecting the antenna pointing.