Opto-Electronic Engineering, Volume. 50, Issue 4, 220225(2023)
Structure design of 1.2 m high lightweight primary mirror blank
Figures & Tables(12)
Fig. 5. Print-through effective of the primary mirror under polishing
Fig. 7. Iteration of optimization process for the primary mirror blank
Fig. 8. Mechanical properties of the primary mirror blank. (a) Gravitational deformation nephogram; (b) The 1st order free vibration mode
Fig. 9. Manufacturing results of the primary mirror blank. (a) Mirror blank; (b) Centroid position test
Fig. 10. Optical processing of the primary mirror. (a) Polishing with the robot arm; (b) Interferogram
Table 1. Physical properties of main materials for the large aperture mirror
View tableView in ArticleTable 1. Physical properties of main materials for the large aperture mirror
Property RB-SiC Beryllium ULE Zerodur Density ρ/(kg·m−3) 3050 1850 2210 2530 Elastic modulus E/GPa 340 287 67 91 Poisson ratio μ 0.2 0.08 0.17 0.24 Thermal conductivity λ/(W·K−1·m−1) 155 216 1.31 1.64 Thermal expansion coefficient α/(10−6·K−1) 2.50 11.4 0.03 0.05 Specific stiffness E/ρ 111.5 155 30.3 36 Thermal stability λ/α 62 18.9 43.7 32.8 Comprehensive performance (E/ρ)·(λ/α) 6913 2939 1324 1180
Table 2. Parameter ranges and optimization results (unit: mm)
View tableView in ArticleTable 2. Parameter ranges and optimization results (unit: mm)
No. Parameter Limits Original Optimal Ultimate 1 Face thickness/T1 [4, 8] 6 4.282 4 2 Bottom thickness/T2 [3, 6] 5 4.419 4 3 Cone thickness/C1 [6, 12] 10 8.154 10 4 Main-stiffener thickness/R1 [3, 6] 5 4.143 4 5 Sub-stiffener thickness/R2 [3, 6] 5 3.246 3 6 Outer wall thickness/O1 [3, 6] 5 3.440 3 7 Central window thickness/O2 [3, 6] 5 3.222 3 8 Peripheral thickness/R3 [3, 6] 5 3.203 3 9 Blank height/H1 [125, 150] 130 146.660 142.5 10 Trimmed height/H2 [100, 125] 100 115.325 125
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Jian Yuan, Lei Zhang, Qifu Jiang, Siyu Pei, Xiaoxue Gong. Structure design of 1.2 m high lightweight primary mirror blank[J]. Opto-Electronic Engineering, 2023, 50(4): 220225
Paper Information
Category: Article
Received: Sep. 15, 2022
Accepted: Jan. 31, 2023
Published Online: Jun. 15, 2023
The Author Email: Zhang Lei (18686344285@163.com)
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