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Research on Modeling and Simulation Analysis for Large Telescope System

Author: ZhouChao
Tutor: YangHongBo
School: Graduate Schoo,Chinese Academy of Sciences
Course: Mechanical Manufacturing and Automation
Keywords: large telescope FEM static and dynamic analysis wind loading seismic excitation
CLC: TH751
Type: PhD thesis
Year: 2011
Downloads: 68
Quote: 0
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Abstract


With the development of space detection, the request for the telescope aperture is more and more large, and the resolution is more and more high, but it also brings some problems such as the primary and second mirror supports, the optical axis stability and overcomplicated structures etc. In order to minimize the structure weight, at the same time meeting the requirement of structure stiffness, stability and system precision, we should take comprehensive static and dynamic analysis for the whole telescope assembly at the initial design stage so we could make the structure optimization.In order to research the finite element method(FEM) for the large telescope assembly system, this paper discusses the development of telescopes, expounds the concept, theoretical basis, static and dynamic analysis processes of the FEM, summarizes the importance of finite element analysis for telescope system and the status of telescope analysis at home and abroad. Afterward, taking a ground-based telescope as an example, this paper carries on some researches by the ways of theoretical analysis, simulation analysis and experiments etc. It concretely includes the following contents:For this telescope, the working characteristics, the connections between main parts and subsystems were detailed studied, a precise finite element model of the whole assembly was established in a rational modeling method. The theoretical analyses for the bearing and nearly incompressible bonds connection were taken. On this basis, rational models were made to describe the two connections; reasonable simplifications were made as a result.Afterward, static analyses for some important parts, subsystems and the whole telescope system were taken, the deformations and stresses of these parts were discussed, and the relative displacements between the primary mirror and second mirror due to different gravity orientation and static wind loading were calculated. These works offer a base for telescope adjustment in different working state.And then some dynamic analyses were completed. The first ten nature frequencies and modals were calculated. The wind loading and seismic excitation which the telescope may suffer in operation were detailed discussed and the mathematic models were established. Analyses were taken by random response method and telescope responses to all loading frequencies were obtained.At last, the concept of sensitivity analysis for telescopes was introduced. Sensitivity analyses of the parts to its parameters and the telescope system to its parts were taken, and corresponding outcomes were got. These works do some instructive help to telescope optimize.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Astronomical instruments > Telescope
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