Infrared and Laser Engineering, Volume. 54, Issue 5, 20240529(2025)
Optimization design of the barrel structure for large-aperture refractive space telescopes
Figures & Tables(19)
Fig. 9. Mirror deformation and face shape cloud of large aperture lens 10
Table 1. Key material parameters
View tableView in ArticleTable 1. Key material parameters
Material Density/ g·cm−3 Young's modulus/ 1010 Pa Specific stiffness/ 107 N·mm·g−1 Coefficient of thermal expansion/ 10−6 ℃−1 Poisson's ratio Aluminum alloy 2.8 7.1 2.53 23.8 0.33 Indium steel 8.1 14.1 1.74 0.3-1.0 0.25 Titanium alloy 4.44 10.9 2.45 9.1 0.34 Magnesium alloy 1.77 4.5 2.54 25.2 0.33
Table 2. Parameters before and after dimensional optimization
View tableView in ArticleTable 2. Parameters before and after dimensional optimization
Design variable Initial value/mm Change region/mm Optimization results/mm T1 3.5 3-5 3 T2 4.5 3-6 3 T3 3.2 3-6 6 T4 3 3-6 4 T5 4.6 3-5 3 T6-T14 4.2 3-5 5
Table 3. Mirror index for large aperture lens 10
View tableView in ArticleTable 3. Mirror index for large aperture lens 10
Load RMS/nm PV/nm 5 ℃ 2.12 9.35 Gz 0.10 0.40 5 ℃+Gz 2.21 9.62
Table 4. Three order modal parameters before and after optimization of the mirror tube
View tableView in ArticleTable 4. Three order modal parameters before and after optimization of the mirror tube
Mode Optimization design/Hz Modal shape 1 2 871 Swing around X axis 2 2 881 Swing around Y axis 3 3 014 Swing around Z axis
Table 5. Impact stress test conditions
View tableView in ArticleTable 5. Impact stress test conditions
Frequency/Hz 100-800 800- 4000 Shock spectral value +9 dB/oct 1000 gDuration ≤20 ms Direction ±X, ±Y, ±Z Number of shocks 1 time in each direction
Table 6. Random vibration test conditions
View tableView in ArticleTable 6. Random vibration test conditions
Frequency range/ Hz Power spectral density Root-mean-square/ grms Test time 20-100 +6 dB/oct 14.33 4 min in each direction 100-400 0.5 g2/Hz 400-2 000 −6 dB/oct
Table 7. Results of impact stress and random vibration analysis
View tableView in ArticleTable 7. Results of impact stress and random vibration analysis
Parts\Load Maximum stress in impact stress/MPa Maximum stress in random vibration/MPa Factor of safety>1.5 Direction along X Direction along Y Direction along Z Direction along X Direction along Y Direction along Z Lens 1 2.064 2.032 8.646 1.037×10−1 1.024×10−1 2.153×10−1 5.78 Lens 2 2.692 2.624 9.855 1.394×10−1 1.374×10−1 2.445×10−1 5.07 Lens 3 1.834 1.831 8.015 9.349×10−2 9.474×10−2 1.961×10−1 6.23 Lens 4 2.499 2.474 8.001 1.543×10−1 1.496×10−1 2.058×10−1 6.24 Lens 5 4.891 4.831 4.533 2.771×10−1 2.720×10−1 1.207×10−1 10.2 Lens 6 4.145 3.972 5.116 2.055×10−1 2.035×10−1 1.179×10−1 9.77 Lens 7 4.584 4.600 5.899 2.413×10−1 2.368×10−1 1.575×10−1 8.47 Lens 8 4.552 4.650 5.806 1.631×10−1 1.610×10−1 2.550×10−1 8.61 Lens 9 3.788 4.121 8.681 1.083×10−1 1.059×10−1 1.771×10−1 5.75 Lens 10 7.943 7.351 5.374 2.277×10−1 2.203×10−1 1.862×10−1 6.29 Lens 11 4.774 4.957 6.387 1.314×10−1 1.304×10−1 2.243×10−1 7.82 Lens 12 8.220 8.367 1.526×101 1.978×10−1 2.027×10−1 2.549×10−1 3.27 Lens 13 5.263 5.200 4.335 1.156×10−1 1.173×10−1 1.168×10−1 9.50 TC4 barrel 4.402E+02 3.995E+02 2.830E+02 9.239 9.267 4.946 1.81
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Zhiyu HUANG, Junqing ZHU, Yongxian WANG, Weiqi HUANG, Yingjun GUAN. Optimization design of the barrel structure for large-aperture refractive space telescopes[J]. Infrared and Laser Engineering, 2025, 54(5): 20240529
Paper Information
Category: Optical design and fabrication
Received: Dec. 23, 2024
Accepted: --
Published Online: May. 26, 2025
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