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Effect of the alidade thermal behavior on the pointing accuracy of a large radio telescope
Wei, Shan-Xiang1,2,3; Kong, De-Qing1,3; Wang, Qi-Ming2,3
2021-08-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume21Issue:6Pages:10
AbstractThe alidade's non-uniform temperature field of a large radio telescope is very obvious under solar radiation. Estimating a radio telescope's pointing errors, caused by the alidade deformation under solar radiation, is significant to improve the telescope's pointing accuracy. To study the effect of the alidade thermal behavior on the pointing accuracy of a large radio telescope, a temperature experiment is first carried out in a 70-m radio telescope on a sunny day. According to the measured results, the temperature distribution rule of the alidade is summarized initially. In addition, the alidade's temperature field is calculated by finite element thermal analysis. The simulated results are proved to be in good agreement with the experimental results. Finally, the alidade deformation under solar radiation is computed by finite element thermal-structure coupling analysis. The telescope's pointing errors caused by alidade deformation are estimated via the alidade's node displacements. The final results show that the effect of alidade thermal behavior on the telescope's elevation pointing errors Delta epsilon(2) + Delta epsilon(r) is much more than the effect on the telescope's cross-elevation pointing errors Delta epsilon(1). The maximum of Delta epsilon(2) + Delta epsilon(r) is more than 45 '', while the maximum of Delta epsilon(1) is less than 6 ''. This study can provide valuable references for improving the pointing accuracy of large radio telescopes.
Keywordtelescopes finite element analysis thermal behavior pointing accuracy
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences
DOI10.1088/1674-4527/21/6/137
WOS KeywordREFLECTOR ANTENNAS ; IMPROVEMENT
Language英语
Funding ProjectNational Natural Science Foundation of China[U1831114] ; National Natural Science Foundation of China[11673040] ; National Natural Science Foundation of China[11803053] ; Chinese Academy of Sciences[U1831114]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000684230300001
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/76020
Collection中国科学院国家天文台
Corresponding AuthorKong, De-Qing; Wang, Qi-Ming
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Key Lab Lunar & Deep Space Explorat, Beijing 100101, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Key Lab FAST, Beijing 100101, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Wei, Shan-Xiang,Kong, De-Qing,Wang, Qi-Ming. Effect of the alidade thermal behavior on the pointing accuracy of a large radio telescope[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2021,21(6):10.
APA Wei, Shan-Xiang,Kong, De-Qing,&Wang, Qi-Ming.(2021).Effect of the alidade thermal behavior on the pointing accuracy of a large radio telescope.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,21(6),10.
MLA Wei, Shan-Xiang,et al."Effect of the alidade thermal behavior on the pointing accuracy of a large radio telescope".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 21.6(2021):10.
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