Volume 13 Issue 6
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Chinese Optics  > 2020  >  13(6): 1352-1361.
ZHAO Yu, SU Cheng-zhi, ZHAO Gui-jun, YANG Guang. Structural optimization for the design of an ultra-lightweight SiC mirror with a diameter of 500 mm[J]. Chinese Optics, 2020, 13(6): 1352-1361. doi: 10.37188/CO.2019-0201
Citation: ZHAO Yu, SU Cheng-zhi, ZHAO Gui-jun, YANG Guang. Structural optimization for the design of an ultra-lightweight SiC mirror with a diameter of 500 mm[J]. Chinese Optics, 2020, 13(6): 1352-1361. doi: 10.37188/CO.2019-0201
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Structural optimization for the design of an ultra-lightweight SiC mirror with a diameter of 500 mm

  • 1.

    College of Mechanical Engineering, Changchun University of Science and Technology, Changchun 130000, China

  • 2.

    Changchun Up Optotech Co., Ltd., Changchun 130000, China

Funds:  Supported by National Natural Science Foundation of China (No. 11873046)
More Information
  • Corresponding author: chengzhi_su@126.com
  • Received Date: 22 Oct 2019
  • Rev Recd Date: 17 Dec 2019
    • Available Online: 09 Nov 2020
  • Publish Date: 01 Dec 2020
    Abstract
  • To meet the performance requirements of ultra-lightweight Φ500 mm-reflector optical system in near diffraction limit, the structure of the reflector is studied using advanced CAE simulation and modern high-performance SiC fabrication technology. Firstly, mirror materials were selected by comparing the common materials and manufacturing processes of existing mirrors. Then, with regards to the structural characteristics of circular symmetrical reflectors, the structure of proposed reflector was designed based on integrated optimization of the full stiffness method. Finally, the reflector assembly was designed with a back-support structure. The simulation results show that the mass of proposed primary mirror is less than 5 kg and the surface density is less than 20 kg/m2. The surface errors (RMS value) of the three directions of dead weight deformation at 4 ℃ temperature rise are less than λ/50. The first-order resonance frequency of the primary mirror assembly is no less than 120 Hz and the stress at the weakest point as measured by dynamic response analysis is less than 100 MPa. The structural optimization of the mirror meets its design requirements, with a remarkable lightweight effect and a structure that is both stable and reliable.

     

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