天籁实验抛物柱面天线阵结构设计与力学分析  

A Structural Design and a Dynamical Analysis of an Experimental Parabolic-Cylinder Radio Antenna at Tianlai

作　　者：朱加炉 陈志平[1] 陈学雷[2] 施浒立[2] 祝男杰 

机构地区：[1]杭州电子科技大学,浙江杭州310018 [2]中国科学院国家天文台,北京100012

出　　处：《天文研究与技术》2015年第1期14-22,共9页Astronomical Research & Technology

基　　金：国家863高技术研究发展计划(2012AA121701)资助

摘　　要：为了满足大面积天区的射电巡天观测,完成对大尺度结构的精确测量和对暗能量的探测,需要设计可安装大量馈源单元的大规模射电干涉阵列天线。抛物柱面的结构形式能较好满足工作需求,对抛物柱面天线阵进行了结构的选型设计。基于有限元方法及有限元分析软件,建立了用于暗能量射电探测的抛物柱面天线阵结构的有限元模型,计算分析了在重力、冰雪和风力等载荷作用时反射面的变形情况。仿真计算分析结果表明:设计的用于暗能量射电探测的天线结构在各种工况下反射面变形量较小,能满足各项设计技术指标要求,从而验证了天线阵结构的合理性、稳定性和可靠性。A large radio interference array of many feeds is required for surveys, precisely measuring cosmological large-scale structures, This paper presents a structural design of a parabolic-cylinder interference array, which is planned to be built at Tianlai in the and detecting carrying out large-area radio dark energy in the Universe. antenna to be fit into such a large radio Xinjiang Autonomous District of China. We have constructed a finite-element model of the antenna. Using the model we have calculated and analyzed deformation patterns of the antenna exerted by gravitational weights and winds, with the gravitational weights being of the antenna itself and covering snow. Our simulations show that deformation levels on the antenna surface are small under various conditions, and meet technical requirements. Therefore, our designed structure is feasible, stable, and reliable.

关 键 词：抛物柱面天线 天线结构设计 有限元仿真 载荷计算 

分 类 号：TN823[电子电信—信息与通信工程]