基于有限元方法的25m天线座架结构热特性分析  

Thermal Characteristics Analysis of 25 m Antenna Mounts Based on the Finite Element Method

作　　者：常文文[1,2] 艾力.玉苏甫[1,3] 许谦[1,3] 项斌斌[1,3] 胡开宇[1,2] 

机构地区：[1]中国科学院新疆天文台,乌鲁木齐830011 [2]中国科学院大学物理科学学院,北京100049 [3]中国科学院射电天文重点实验室,乌鲁木齐830011

出　　处：《机械科学与技术》2015年第5期812-816,共5页Mechanical Science and Technology for Aerospace Engineering

基　　金：探月三期25米改造项目与西部之光项目(XBBS201122)资助

摘　　要：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。According to the sun radiation at Nan-Shan,we obtain Xinjiang Astronomical Observatory,via finite element analysis software,the temperature distribution and thermal deformation. Simplify the details and the model was established in ANSYS,and the boundary conditions of solar radiation,periodic air temperature and long-wave radiation are computed each hour in a cloudless day( June 21th) in summer. Then the transient temperature analysis was conducted and the temperature distribution and the deformation of structure were obtained. The result indicated that: the temperature of the antenna mounts changes large in one day,the highest temperature difference reaches 9 ℃; the most serious deformation under sun radiation,which RMS( root mean square) up to 1.8 mm,this significantly influence the pointing accuracy of the antenna.

关 键 词：25 m天线 有限元分析 热流密度 温度场 热变形 

分 类 号：TN820.82[电子电信—信息与通信工程]