Optimization and Finite Element Analysis of Large-Aperture SiC Lightweight Primary Mirror

Congjing Wang; Dong Wang; Xin Huang; Jing Wang

doi:10.3788/AOS202141.1122002

Acta Optica Sinica, Volume. 41, Issue 11, 1122002(2021)

Optimization and Finite Element Analysis of Large-Aperture SiC Lightweight Primary Mirror

Congjing Wang^1,2, Dong Wang^1,2, Xin Huang^1,2, and Jing Wang^1、*

¹Key Laboratory of Space-Based Dynamic & Rapid Optical Imaging Technology, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, Jilin 130033, China;

²School of Material Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China

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Figures & Tables(16)

Fig. 1. Three-dimensional model of fan-shaped lightweight primary mirror

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Fig. 2. Axial brace model

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Fig. 3. Distribution diagram of support points

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Fig. 4. Radial brace model

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Fig. 5. Distribution diagram of support structures

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Fig. 6. Finite element model of primary mirror chamber

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Fig. 7. Stress nephogram of optical axis vertical

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Fig. 8. Stress nephogram with optical axis of 45°

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Fig. 9. Stress nephogram of optical axis horizontal

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Fig. 10. Surface error curves of primary mirror

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Fig. 11. Displacement nephogram of optical axis vertical

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Fig. 12. Displacement nephogram with optical axis of 45°

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Fig. 13. Displacement nephogram of optical axis horizontal

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Fig. 14. Test result of primary mirror surface

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Table 1. Physical properties of SiC
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Table 1. Physical properties of SiC
Density /(g·cm^-3) Elasticity modulus /GPa Poisson ratio Bending strength /MPa
3.05 392 0.25 100

Table 2. Comparative analysis of primary mirror in different situations
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Table 2. Comparative analysis of primary mirror in different situations
t₁ /mm RMS1 /nm RMS2 /nm RMS3 /nm m /kg
8 6.88 6.08 4.42 89.36
6 7.11 6.21 4.72 75.38
4 7.71 6.74 5.32 60.66

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Congjing Wang, Dong Wang, Xin Huang, Jing Wang. Optimization and Finite Element Analysis of Large-Aperture SiC Lightweight Primary Mirror[J]. Acta Optica Sinica, 2021, 41(11): 1122002

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