The reflector system of the five-hundred-meter aperture spherical radio telescope (FAST) is composed of 4450 panels. The initial gap between these panels directly affects the technical performance of the telescope. The initial gap between panels that is too wide will reduce the effective collecting area of FAST, and thus compromising the sensitivity of the telescope. On the other hand the initial gap between panels that is too narrow may lead to collisions between the panels under certain observation conditions. It is thus important to reasonably determine the size of the initial gap between panels in ensuring the technical performance of the telescope. In this paper, the criterion to determine collisions between panels is given by the method of vector geometry, the collisions of panels under normal observation conditions are studied, as well the worst situations with actuator failures using the analytical results from the integrated finite element model of the reflector, combined with aforementioned criterions. Meanwhile, a reasonable value for initial gap between the panels is determined, providing parameters for the design of the panels.
LI Qingwei
,
JIANG Peng
,
NAN Rendong
. Initial Gap between Panels of the Reflector of FAST[J]. Journal of Mechanical Engineering, 2017
, 53(17)
: 4
-9
.
DOI: 10.3901/JME.2017.17.004
[1] NAN Rendong, REN Gexue, ZHU Wenbai, et al. Adaptive cable mesh reflector for the FAST[J]. Acta Astronomica Sinica, 2003, 44:13-18.
[2] LI Guoqiang, SHEN Liyuan, LUO Yongfeng, et al. Analysis for reflector aluminum mesh panels of five-hundred meter aperture spherical telescope[J]. Astrophysics and Space Science, 2001, 278(1):225-230.
[3] TANG Xiaoqiang, ZHU Wenbai, SUN Chaihong, et al. Similarity model of feed support system for FAST[J]. Experimental Astronomy, 2011, 29(3):177-187.
[4] JIANG Peng, NAN Rengdong, QIAN Lei, et al. System solutions study on the fatigue of the FAST cabel-net structure caused by form-changing operation[J]. Research in Astronomy and Astrophysics, 2015(15):1758-1772.
[5] YAO Rui, ZHU Wenbai, HUANG Peng. Accuracy analysis of Stewart platform based on interval analysis method[J]. Chinese Journal of Mechanical Engineering, 2013, 26(1):29-34.
[6] 杨癸庚,杨东武,杜敬利,等. 一种基于力密度的网状可展开天线索网结构初始形态设计方法[J]. 机械工程学报, 2016, 52(11):34-41. YANG Guigeng, YANG Dongwu, DU Jingli, et al. Method for deployable mesh antenna cable network structures' form-finding design based on force density[J]. Journal of Mechanical Engineering, 2016, 52(11):34-41.
[7] 罗永峰, 邓长根, 李国强, 等. 500m口径主动球面望远镜反射面支撑结构分析[J]. 同济大学学报, 2000, 28(4):497-501. LUO Yongfeng, DENG Changgen, LI Guoqiang, et al. Structural analysis of the reflector supporting system of the 500m active spherical telescope[J]. Journal of Tongji University, 2000, 28(4):497-501.
[8] 钱宏亮,范峰,沈世钊,等. FAST反射面支承结构整体索网分析[J]. 哈尔滨工业大学学报, 2005, 37(6):750-752. QIAN Hongliang, FAN Feng, SHEN Shizhao, et al. Analysis on cable-net structure supporting the reflector of FAST[J]. Journal of Harbin Institute of Technology, 2005, 37:750-752.
[9] 刘钰,高峰. FAST反射面支撑索网结构的初始状态求解[J]. 机械工程学报2013, 49(6):66-73. LIU Yu, GAO Feng. Study of the initial status of cable-net structure reflector for the FAST[J]. Journal of Mechanical Engineering, 2013, 49(6):66-73.
[10] 姜鹏,王启明,赵清. 巨型射电望远镜索网结构的优化分析与设计[J]. 工程力学, 2013, 30(2):400-405. JIANG Peng, WANG Qiming, ZHAO Qing. Optimization and analysis on cable net structure supporting the reflector of large radio telescope FAST[J]. Engineering Mechanics, 2013, 30(2):400-405.
[11] 孔旭,姜鹏,王启明. FAST索网高应力幅变位疲劳问题的优化分析[J]. 工程力学, 2013, 30(增刊):169-174. KONG Xu, JIANG Peng, WANG Qiming. Investigation on fatigue life of FAST cable-net under high stress amplitude produced by long-time active[J]. Engineering Mechanics, 2013, 30(Suppl.):169-174.
[12] ZHAN Jingqing, ZHANG Xianmin. Topology optimization of compliant mechanisms with geometrical nonlinearities using the ground structure approach[J]. Chinese Journal of Mechanical Engineering, 2011, 24(2):257-263.
