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Design and Analysis of the Four-way Body for a Horizontal Tracking-mount Based on Laser Emission

Author: SiLiNa
Tutor: GaoYunGuo
School: Graduate Schoo,Chinese Academy of Sciences
Course: Mechanical Manufacturing and Automation
Keywords: laser tracking and emission tracking-mount the four-way body finite element analysis tracking precision
CLC: V556.7
Type: Master's thesis
Year: 2010
Downloads: 34
Quote: 0
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Abstract


There are three usual structural styles of tracking-mount,respectively named as alt-azimuth style ,equatorial style, horizontal style. As the alt-azimuth style has the defect of blind zone in the vertex area and the equatorial style is quite complex structurally, the horizontal style is chosen to compose a laser tracking and emission system. Considering the tracking precision requirements of this system, exploration and analysis on the related technological problems of the horizontal tracking-mount are necessary.Based on the optical scheme of this laser tracking and emission system, the structure of the four-way body for the tracking-mount and three reflector subassemblies were designed and their three-dimensional entity models were built through UG software. This four-way body is the fixing platform of detection structure, CCD receiving devices, laser beam emission structure, reflector subassemblies, etc. And it circumrotates in the whole tracking and emission course droved by outer forces. So, high structural precision, good dynamic characteristic, and qualified structure stiffness are required strictly on this part.Combined the finite element analysis with optimization design theory, the structural thicknesses of the four-way body were optimized and computed, lightening the weight of the four-way body by 12%. The FEM model of the four-way body with loads was established based on static analysis theory, and then its static characteristics was analyzed. The information of structural deformation was shown and extracted. Based on the analysis results, the deflection angles of optical axis and three reflectors were calculated by the eigen-value method. ReflectorⅠturns out to be the most important reason which influences the deflection angle. So some structural details were adjusted in order to improve the tracking precision.The deflection angle of optical axis caused by structural deformation arrives at 2.14″, satisfying the technical index. Coude optical experiment was finished after the sample machine of laser tracking and emission was built successfully, and the experiment results proved very close to the analysis results, indicating the reliability and practicability of FEM analysis in this paper.

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CLC: > Aviation, aerospace > Aerospace ( Astronauts ) > Ground equipment, test site, launch sites, space base > Ground-based measurement and control system > Laser tracking measurement system
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