Optics and Precision Engineering, Volume. 30, Issue 4, 442(2022)
Wind disturbance simulation and optical performance prediction for large ground-based optical telescopes based on two-dimensional stochastic fields
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Fig. 7. Surface precision of the primary and secondary mirror-primary mirror loaded separately
Fig. 8. Optical axis perturbation of the primary and secondary mirror-primary mirror loaded separately
Fig. 9. Position deviation of the primary and secondary mirror-primary mirror loaded separately
Fig. 10. Surface precision of the primary and secondary mirror-secondary mirror and truss loaded separately
Fig. 11. Optical axis perturbation of the primary and secondary mirror-secondary mirror and truss loaded separately
Fig. 12. Position deviation of the primary and secondary mirror-secondary mirror and truss loaded separately
Fig. 13. Frequency spectrum of position deviation between primary and secondary mirror-secondary mirror and truss loaded separately
Table 1. Parameters of wind load
View tableView in ArticleTable 1. Parameters of wind load
Parameters Meaning Value vm External wind speed 10 m/s and 15 m/s ρ Air density 1.293 kg/m3 Asm Area for SM and baffle 227 500 mm2 Atruss Area for truss 1 025 088 mm2 Aspider Area for spider 809 600 mm2 Aring Area for top ring 392 370 mm2 CD，sm Drag coefficient for SM 1.2 CD，truss Drag coefficient for truss 1.2 CD，spider Drag coefficient for spiders 1.2 CD，pm Drag coefficient for PM 1.05 Lx Spatial length in x direction 2 500 mm Ly Spatial length in y direction 2 500 mm H Height 6 400 mm
Table 2. Discretized parameters of wind speed fields
View tableView in ArticleTable 2. Discretized parameters of wind speed fields
Parameters Meaning Value z Height above ground 10 m z0 Ground roughness coefficient 0.01 λx Decay coefficient in x direction 7 λy Decay coefficient in y dir 7 Nx Wave-number in x dir 128 Ny Wave-number in y dir 128 Nω Frequencies 1 024 M1 Sample numbers in x dir 256 M2 Sample numbers in y dir 256 M3 Sample numbers in time domain 2048 T Simulation time length 100s ∆κx Wave-number space in x dir 0.002 5 mm-1 ∆κy Wave-number space in y dir 0.002 5 mm-1 ∆ω Frequency space 0.062 8 s-1 ∆x Spatial step in x dir 9.766 mm ∆y Spatial step in y dir 9.766 mm ∆t Time step 0.048 8 s
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Yuyan CAO, Jianli WANG, Zhichen WANG, Hongwen Li, Yan ZHANG, Hongliang CHU, Yuxia LI. Wind disturbance simulation and optical performance prediction for large ground-based optical telescopes based on two-dimensional stochastic fields[J]. Optics and Precision Engineering, 2022, 30(4): 442
Paper Information
Category: Micro/Nano Technology and Fine Mechanics
Received: Jun. 22, 2021
Accepted: --
Published Online: Mar. 4, 2022
The Author Email: CAO Yuyan (yuyan_cao@126.com)
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