Acta Photonica Sinica, Volume. 48, Issue 12, 1222001(2019)
Design and Test of Flexible Supporting Structure for Ultra-light Mirror
Figures & Tables(15)
Fig. 3. 柔性支撑结构的参数化尺寸Parametric dimensions of flexible support structure
Fig. 4. 柔性支撑结构有限元模型Finite element model of flexible supported structures
Fig. 10. 光学干涉仪检测的面形图Surface nephogram detected by optical interferometer
Table 1. Material and performance parameters of mirror assembly
View tableView in ArticleTable 1. Material and performance parameters of mirror assembly
Material Elasticity modulus/GPa Poisson's ratio Density/(g·cm-3) Thermal expansion coefficient/(10-6m·℃-1) Mirror SiC 350 0.27 3.05 2.70 Flexible support 4j36 invar alloy 140 0.25 8.10 2.70
Table 2. Optimization results of design parameters
View tableView in ArticleTable 2. Optimization results of design parameters
Design variables Value ranges/mm Initial values/mm Optimization results/mm Structured values/mm l h11~7 3 4.527 4.53 l h21~7 3 3.519 3.52 l v13.5~15.4 4.5 12.331 12.33 l v23.5~15.4 4.5 6.848 6.85 h 1~10 6 1.881 1.88 t h10~19.6 4 1.316 1.32 t h20~19.6 2.5 1.497 1.50 t v10~19.6 2.5 1.296 1.30 t v20~19.6 2.5 1.762 1.76 b 0~7.6 3.6 3.061 3.06
Table 3. Surface error of mirror under various load cases
View tableView in ArticleTable 3. Surface error of mirror under various load cases
Load cases Gx Gy Gz Δ t Gx & Δt Gy & Δt Gz & Δt RMS/nm 0.26 0.28 1.19 2.38 2.49 2.55 2.95
Table 4. Random vibration test conditions
View tableView in ArticleTable 4. Random vibration test conditions
Random vibration input conditions ( X ,Y ,Z )Frequency range/Hz 10~80 80~800 800~2 000 PSD/(g2·Hz-1) +3 dB/oct 0.01 -6 dB/oct GRMS/g 3.56
Table 5. Comparison of simulation analysis and test results
View tableView in ArticleTable 5. Comparison of simulation analysis and test results
Direction X Y Z Comparison the results of frequency scanning test with modal analysis Analysis/Hz 635.6 634.8 1735.4 Test/Hz 627.3 625.9 1700.1 Relative error/% 1.3 1.4 2.0 Comparison the results of random vibration test with analysis Analysis/g 12.8 13.1 15.6 Test/g 13.4 14.2 17.1 Relative error/% 4.7 8.4 9.6
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Meng-qi SHAO, Lei ZHANG, Lin LI, Lei WEI, Xue-zhi JIA. Design and Test of Flexible Supporting Structure for Ultra-light Mirror[J]. Acta Photonica Sinica, 2019, 48(12): 1222001
Paper Information
Received: Jul. 23, 2019
Accepted: Sep. 6, 2019
Published Online: Mar. 17, 2020
The Author Email: ZHANG Lei (18686344285@163.com)
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