Mr. Lihua Wen Profile

Lihua Wen

at Northwestern Polytechnical Univ.

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Proceedings Article | 18 December 2023 Paper

The study on dynamics characteristics of focal plane assembly of survey module of CSST

Tonglei Jiang, Lihua Wen, Hai Yan, Jing Guo, Wenzhong Shi, Yong Bai

Proceedings Volume 12965, 1296508 (2023) https://doi.org/10.1117/12.3007922

KEYWORDS: Vibration, Frequency response, Analytical research, Sensors, Imaging spectroscopy, Elasticity, Telescopes, Modal analysis, Design and modelling, Structural design

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The scientific research mission of the China Survey Space Telescope (CSST) imposes rigorous requirements on the observation precision. The survey module is the most important scientific payload of the CSST and will conduct the wide-field multiband imaging and slitless spectroscopy survey at a resolution close to that of the Hubble Space Telescope. The focal plane of the survey module is the imaging part of the CSST, and carrying its dynamics performance research has great theoretical significance and engineering value. First, based on the transfer path analysis theory, the transfer path analysis model of the focal plane assembly is established, and vibration experiments are conducted to investigate the transfer mechanism of micro-vibration within the focal plane assembly. The results of this study can provide substructure dynamic data for the overall dynamic analysis of the CSST, enabling the direct acquisition of focal plane vibration response data in accordance with the input values from vibration sources in subsequent analyses. Secondly, the modal parameters of the focal plane assembly are obtained by using the hammering method to conduct modal analysis experiments on the focal plane components in two states: installed and free. These research results provide data support for determining whether the survey module meets the fundamental frequency requirements of the spacecraft. The results show that the modal parameters of the focal plane assembly meet the engineering requirements, affirming the correctness of the structural design. The research results of this paper also provide a basis for the subsequent structural dynamic optimization of the survey module and CSST.

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