上海65m射电望远镜天线结构日照非均匀温度场

Analysis on non-uniform temperature field due to sunshine for the antenna structure of Shanghai 65-meter-aperture radio telescope

研究分析太阳辐射作用下上海65m射电望远镜天线结构的非均匀温度场。首先解析光线投影算法计算天线结构日照阴影的具体步骤,基于该算法编写天线结构日照阴影分析程序,然后采用该程序对不同工作旋转角的天线结构进行日照阴影数值模拟,获得各构件不同时刻的日照系数;在此基础上,修正天线结构各构件所吸收的太阳辐射能量,以此作为主要热荷载模拟不同工作旋转角下天线结构的非均匀温度场,统计天线结构温度场分布的时间特性和空间特性。分析结果表明:光线投影算法可以有效地解决射电望远镜天线结构的日照阴影问题,日照阴影对天线结构的温度分布具有不可忽视的影响。

The non-uniform temperature field due to solar radiation for the antenna structure of Shanghai 65 -meteraperture radio telescope is numerically investigated. Firstly, the specific steps of ray casting algorithm to calculate sunlight shadow on antenna structures are introduced, and based on this algorithm, a special program is developed for simulating sunlight shadow on antenna structures. When applying this program, the daylight coefficients for all components of antenna structures in different azimuth and elevation angles are calculated. Secondly, the daylight coefficients are utilized to modify the total solar radiation energy absorbed by the components of antenna structure, and then the modified energy is input as the main thermal load to simulate the non-uniform temperature field of antenna structures. Finally, the temporal and spatial characteristics of temperature distribution for the antenna structure of Shanghai 65-meter-aperture radio telescope are statistically investigated. The research findings clearly show that the sunlight shadow on antenna structures of radio telescopes can be effectively figured out by using the ray casting algorithm, and the sunlight shadow may significantly influence the temperature field of antenna structures.