电波科学学报2017，Vol.32Issue(3)：314-322,9.DOI:10.13443/j.cjors.2017041901
天马望远镜结构重力变形对面形和指向精度影响
Effect of gravity deformation of TianMa telescope structure on the surface and pointing accuracy
摘要
Abstract
Taking TianMa telescope (abbreviated as TM65m) as research object,the variations of primary surface accuracy and antenna pointing accuracy under gravity were researched using the method of combining simulation and experiment.The gravity deformations of structure were analyzed at different elevation angles by finite element software and the corresponding actuator adjustments of primary surface were obtained.The antenna efficiency improves 20％ at elevation angle of 35° and 71° when the actuator adjustments were loaded into the active surface system and the primary surface was adjusted.The vertex position of primary surface changed after the gravity deformations of the primary surface were modified.The variation of pointing error is 0.037 99° from 5° to 90° elevation angle when the position variations were converted into the pointing model,which is compared to the modified parameter of gravity error of the real pointing model and the error is 4％.Simultaneously,we found that the gravity of elevation structure and above it leads to elevation axis bend at different elevation angles.The maximum deflection acquired from finite element analysis is 3.2mm.The variation trend keeps in line with measured results of inclinometer,which results in the elevation pointing variation reaching 0.012 14° arc-second.Consequently,reasonable structure design is important to improve antenna accuracy.关键词
射电望远镜/重力变形/面形精度/指向精度/主动面系统Key words
radio telescope/gravity deformation/surface accuracy/pointing accuracy/active surface system分类
信息技术与安全科学引用本文复制引用
付丽,董健,凌权宝,蒋甬斌,王锦清,虞林峰,刘庆会..天马望远镜结构重力变形对面形和指向精度影响[J].电波科学学报,2017,32(3):314-322,9.基金项目
国家自然科学基金(No.Y787111002 （）
No.Y347201001) （）
