Design technology of the truss support structure of the ultra-low thermal deformation gravitational wave detection telescope

Li Bohong; Luo Jian; Qiu Minyan; Chen Wenduo; Zhao Hongchao

doi:10.12086/oee.2023.230155

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Li B H, Luo J, Qiu M Y, et al. Design technology of the truss support structure of the ultra-low thermal deformation gravitational wave detection telescope[J]. Opto-Electron Eng, 2023, 50(11): 230155. doi: 10.12086/oee.2023.230155

Citation:

Li B H, Luo J, Qiu M Y, et al. Design technology of the truss support structure of the ultra-low thermal deformation gravitational wave detection telescope[J]. Opto-Electron Eng, 2023, 50(11): 230155. doi: 10.12086/oee.2023.230155

Design technology of the truss support structure of the ultra-low thermal deformation gravitational wave detection telescope

1.
MOE Key Laboratory of TianQin Mission, TianQin Research Center for Gravitational Physics & School of Physics and Astronomy, Frontiers Science Center for TianQin, Gravitational Wave Research Center of CNSA, Sun Yat-sen University (Zhuhai Campus), Zhuhai, Guangdong 519082, China
2.
School of Materials, Shenzhen Campus of Sun Yat-sen University, Shenzhen, Guangdong 518107, China
3.
School of Advanced Manufacturing, Shenzhen Campus of Sun Yat-Sen University, Shenzhen, Guangdong 518107, China

Fund Project: Project supported by National Key Research and Development Program of China (2021YFC2202202), and Shenzhen Science and Technology Program (JCYJ20190807161011714，20220818153519003)

More Information

^*Corresponding author: zhaohongch@mail.sysu.edu.cn

Received Date 29 June 2023

Revised Date 14 October 2023

Accepted Date 16 October 2023

Published Date 29 December 2023

Abstract

Abstract

This paper focuses on the ultra-low thermal deformation requirements of the main support structure of the gravitational wave detection telescope. It proposes a method to reduce the thermal deformation of the truss support structure by designing CFRP (carbon fiber reinforced polymer) layers to modify the material's thermal expansion coefficient. Additionally, to meet the alignment performance requirements of the telescope, a segmented design scheme for the structure is presented. The paper begins by analyzing the advantages of CFRP, existing methods of thermal dissipation, and the research progress both domestically and internationally. It determines the three-segment telescope design using CFRP as the support material and establishes design criteria. Next, mathematical models for "material-thermal deformation" and "truss structure-thermal deformation" are developed. Optimization is conducted for material layering and structural design, resulting in an optimized solution. Furthermore, CFRP materials are applied to the support structure, and a segmented main support structure design scheme is proposed to reduce the difficulty of structural processing and alignment. The overall structure is analyzed. The analysis results demonstrate that, in terms of mechanical performance, the overall structure's natural frequency and maximum gravity-unloading deformation meet the requirements of the main support structure. In terms of thermal deformation, the optimized design based on CFRP layering exhibits a thermal deformation that is 27.15% of the conventional layering scheme, 6.42% of the Invar material support rod scheme, 11.50% of the SiC support rod scheme, and 3.21% of the titanium alloy support rod scheme. This indicates that the optimized design can significantly reduce the structural thermal deformation.
- thermal dissipation design /
- CFRP layup design /
- coefficient of thermal expansion

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References

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Overview

Overview

At the current stage, gravitational wave telescopes have stringent requirements for thermal deformation stability. Due to limitations in manufacturing processes and material properties, it is necessary to optimize the CFRP material and structural configuration to achieve the desired design. Based on the current progress in gravitational wave telescope design and the level of manufacturing processes, combined with a comparative analysis with advanced space-based telescopes domestically and internationally, it is deemed reasonable to set the thermal deformation design target for the support structure at α<1.0×10⁻⁷/K. This paper primarily focuses on the following research aspects: 1) In order to reduce the overall thermal deformation of the structure to below 1×10⁻⁷/K, it is necessary to ensure that the thermal expansion coefficient of the truss material meets this requirement. Therefore, the CFRP material layering scheme is optimized to reduce its longitudinal thermal expansion coefficient to below 1×10⁻⁷/K, which is then used for the axial direction of the truss rods. 2) Provide a structural optimization scheme to observe whether the structure can meet the requirements of ΔT=10 K conditions for the relative rigid-body displacement between the primary and secondary mirrors, ensuring dz < 10 μm and dy < 5 μm. Additionally, check if weight, modal properties, gravitational unloading, and other aspects meet the standards. 3) Building upon this, discuss whether the use of CFRP material meeting the 1×10⁻⁷/K level can satisfy the structural stability requirements after being incorporated into the structure as truss material. 4) Compare the advantages and design potential of CFRP with conventional telescope truss materials. Therefore, the paper first analyzes the advantages of CFRP, existing methods of thermal dissipation, and research progress both domestically and internationally. It establishes a design scheme for a three-rod telescope with CFRP as the support material and proposes design criteria. Mathematical models are then developed to describe the relationship between material properties and thermal deformation as well as truss structure thermal deformation. Optimization is performed on material layering and structural design, and an optimized solution is provided. Finally, CFRP material is applied to the support structure, a segmented main support structure design is presented to reduce manufacturing and alignment difficulties, and an overall structural analysis is conducted. The analysis results demonstrate that, in terms of mechanical performance, the truss structure has a weight of 6.7 kg and a fundamental frequency of 122.61 Hz. In terms of thermal deformation, the optimized design based on CFRP layering exhibits a thermal deformation that is 27.15% of the conventional layering scheme, 6.42% of the Invar material support rod scheme, 11.50% of the SiC support rod scheme, and 3.21% of the titanium alloy support rod scheme. This indicates that the optimized design can significantly reduce the structural thermal deformation.