Mr. Yong Bi Profile

Yong Bi

at Univ. of Science and Technology of China

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Proceedings Article | 15 February 2022 Paper

Optimal design of a 800mm vehicle mounted telescope's main mirror support scheme

Bei-bei Chen, Yong-xing Yang, Jing-yuan Zhang, Jin-peng Li, Yong Bi

Proceedings Volume 12166, 1216606 (2022) https://doi.org/10.1117/12.2604885

KEYWORDS: Mirrors, Telescopes, Vibrometry, Thermal analysis, Optical instrument design, Finite element methods, Modal analysis, 3D modeling, Optimization (mathematics), Clouds

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Vehicle-mounted telescopes will suffer a lot of outside interference during the transportation and use. Such as the vibration and temperature difference. Aiming at the problems, this paper optimized the design of the supporting system for the main mirror of the 800mm telescope. Firstly, the position of the main mirror support point and the size of the support force are optimized and analyzed by using the ANSYS. In order to analyze the vibration during transportation, the vehicle transportation process is simplified to a random vibration model, and analyze its mode of vibration. At the same time, the influence of temperature difference on the accuracy of the main mirror surface during use is analyzed. The results show that after optimization of the main mirror support point and the support force, the RMS (Root Mean Square) of the surface accuracy under calculation is less than 1/30λ(λ=632.8mm), the modal frequency of the main mirror(207Hz) is greater than the general vehicle vibration frequency(20Hz), it can effectively avoid resonance. On the basis, loading random acceleration excitation, the maximum stress is only 49.8Mpa, which is much smaller than the yield strength of the material used(>355Mpa). It can guarantee primary mirror accuracy well. And under the temperature difference of 5K, the maximum deformation of the main mirror is 0.106μm, which can well satisfy the design requirements.

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