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The Finite Element Modeling and Thermal Analysis of the Special Focal Plane of LAMOST
Zuo Heng; Yang Dehua; Li Guoping
Source PublicationGround-based and Airborne Telescopes III
PagesVol.7733 5I-1-9
Conference Date2010-6-27
Conference PlaceSan Diego, California, USA
Funding OrganizationThe International Society for Optical Engineering
The Large Area Multi-Object Spectroscopic Telescope (LAMOST) is a meridian reflecting Schmidt telescope with a 40m optical axis between the reflecting Schmidt plate and the spherical primary mirror. In the middle is located the spherical focal plane, through which there are corresponding 4000+ unit mounting holes for the fibers, and on its back, there attached a support truss adapted from Serrurier concept. The mechanical stabilization of the focal plane system naturally has magnificent impact on the observation efficiency of the LAMOST. A comprehensive Finite Element Model of the focal plane system has been built to evaluate thermally induced degradation of its mechanical accuracy using the nodal modification technique within ANSYS, and diverse temperature load cases have been considered on the Finite Element model and related thermal analyses have been carried out to investigate thermal deformation of the focal plane. Subsequently the calculated deflection of the working surface has been extracted and reconstructed with least square fitting in MATLAB. The results show that temperature change around the telescope has little effect on the performance of the focal plane within temperature variation requirements of the LAMOST. The methods of modeling and analyzing used in this research are informative for future large telescope projects.
KeywordLamost Focal Plane Thermal Analysis Fea Sphere Fitting
Subject Area郭守敬望远镜(lamost) ; 有限元分析
Document Type会议论文
Recommended Citation
GB/T 7714
Zuo Heng,Yang Dehua,Li Guoping. The Finite Element Modeling and Thermal Analysis of the Special Focal Plane of LAMOST[C]:SPIE,2010:Vol.7733 5I-1-9.
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