大型射电望远镜结构的“太阳灶”效应

Analysis of Solar Oven Effect on Large Radio Telescope

以待建的新疆110m全可动射电望远镜结构为分析平台,选取副反射面结构为研究对象,采用瞬态传热有限元分析方法,建立了考虑直接太阳辐射、散射太阳辐射、地面反射等因素的望远镜反射面结构日照温度场精细化数值模型。并选取最不利工况对其进行日照作用分析,获得了望远镜变位中电磁波聚焦在副反射面产生的"太阳灶"效应的时间及空间分布特性。其成果将为副反射面结构的设计、建造及工作性能的正常发挥提供必要支撑,也为此类问题的解决提供相应的技术参考。

The being built 110m fully-steerable radio telescope is used as the analysis platform and the secondary reflector structure is selected as research object. The finite element model of the all-movable telescope for structural temperature field analysis is established, taking the factors of direct solar radiation, diffuse solar radiation, and ground reflection into account at the same time. The worst weather condition is selected to abalyze the solar exposure action and the distribution of non-uniform solar temperature field for the structure is figured out. The solar cooker effect combined the time and spatial distributions on the secondary reflector by the time course is acquired during the change of pitch and azimuth angle. These achievements not only provide the necessary support for the structure design, construction and the normal performance but also provide the appropriate technical reference for solving this sort of problems.