FAST反射面单元在索网变位中的碰撞分析

doi:10.19665/j.issn1001-2400.2019.05.021

摘要/Abstract

摘要：

500 m口径球面射电望远镜采用柔性索网作为反射面支撑结构,反射面单元通过专用机构与索网连接,促动器连接下拉索控制索网,实现主动变位。在变位中,反射面单元要自适应于索网的各种变化,同时避免发生碰撞。为了给变位整体运行提供冗余保障,得出反射面单元碰撞分析基本机理及准则,基于索网与反射面单元的结构关系,将反射面单元的碰撞分析转化为对应主索单元的应力分析。通过设定条件下主索单元应力计算方法,对相关反射面单元碰撞问题进行分析。提出了正常变位情况下判别反射面单元碰撞的基本准则。通过计算变位后主索应力变化,提出分析判断正常变位反射面单元碰撞的方法,并提供了分析算例与结果。一定程度初步说明了正常变位条件下索网及反射面变位的合理性。

关键词: 500 m口径球面射电望远镜, 射电望远镜, 天线反射面, 反射面单元, 碰撞分析

Abstract:

As the supporting structure of the active reflector of the Five-hundred-meter Aperture Spherical radio Telescope, the cable-net is connected with reflector elements through special mechanisms, to change its shape and form in paraboloid or sphere by active control actuators. In this process, reflector elements should adapt to shapes of the cable-net and avoid collisions. In order to provide complement protection for the operation of shape-changing, we obtain the basic principle and criterion of collision analysis of reflector elements. The structural relationship between cable-net and reflector elements enables the collision analysis to be transformed into the stress analysis of the corresponding cables. Through the stress calculation of the corresponding cables under a certain condition, the collision problem of reflector elements is analyzed. A basic criterion is given to show whether collision happens or not during normal shape-changing of the cable-net. Based on the analysis, a method is presented to analyze collisions of reflector elements by calculating the stress change of cables, and the analytical example and result are given. In some sense, the rationality of shape-changing of the cable-net and reflector under normal conditions is explained.

Key words: five-hundred-meter aperture spherical radio telescope, radio telescopes, antenna reflectors, reflector elements, collision analysis

中图分类号:

TU311

李建玲,彭勃,李辉,李庆伟,沈宇洲,姜鹏,罗斌. FAST反射面单元在索网变位中的碰撞分析[J]. 西安电子科技大学学报, 2019, 46(5): 148-154.

LI Jianling,PENG Bo,LI Hui,LI Qingwei,SHEN Yuzhou,JIANG Peng,LUO Bin. Analysis of collisions of reflector elements of the FAST active reflector[J]. Journal of Xidian University, 2019, 46(5): 148-154.

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