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WEI Yu-xuan, WANG Zhen-yu, LI Zhi-guo, HUANG Le-hong, YANG Kai, MA Yu-bao. Lightweight and optimized U-frame design for space-borne two-dimensional turntable[J]. Chinese Optics. doi: 10.37188/CO.2023-0227
Citation: WEI Yu-xuan, WANG Zhen-yu, LI Zhi-guo, HUANG Le-hong, YANG Kai, MA Yu-bao. Lightweight and optimized U-frame design for space-borne two-dimensional turntable[J]. Chinese Optics. doi: 10.37188/CO.2023-0227

Lightweight and optimized U-frame design for space-borne two-dimensional turntable

doi: 10.37188/CO.2023-0227
Funds:  Supported by National Key Research and Development Program of China (No. 2022YFB3707804)
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  • Corresponding author: lzg@opt.ac.cn
  • Available Online: 22 May 2024
  • Space-borne two-dimensional turntables are the main bearing mechanism of space cameras and other optoelectronic equipment, and the U-frame is the key supporting part of these turntables. In order to optimize the structure and lightweight design of the U-frame of the two-dimensional rotary table and to develop a lightweight two-dimensional rotary table with a high load-bearing ratio, this paper designs a carbon fiber composite U-frame for the two-dimensional rotary table. First, a variable cross-section tubular structure U-frame was designed using carbon fiber composites instead of titanium alloy material, combined under consideration of manufacturability. Then, according to the finite element modeling method based on the lay-up process, the carbon fiber U-frame was subjected to finite element modeling and simulation analysis. Then, a prototype U-frame was fabricated, and modal tests verified the accuracy of the finite element model. Finally, a three-level optimization method combining theoretical analysis, genetic algorithm, and the finite element method was proposed to optimize the design of carbon fiber U- frame ply angle, ply thickness, and ply sequence. The results indicate that the vibration patterns of the U-frame obtained from the modal test and simulation are identical and that the frequency difference is less than 5%. The initial design of the carbon fiber U-frame was 45.7% lighter than the titanium U-frame. Through the secondary optimization of the composite layup, the U-frame was further reduced in weight by 13.8%. Additionally, the intrinsic frequency of the U-frame was improved by 10.14%. The composite modeling and optimization methods used in this paper are correct, and the designed carbon fiber U-frame meets the lightweight design requirements of two-dimensional rotary tables.

     

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