Infrared and Laser Engineering, Volume. 49, Issue 7, 20190469(2020)
Structural design optimization of space gravitational wave telescope primary mirror system
Figures & Tables(17)
Fig. 3. Schematic diagram of the layout of mirror support structure
Fig. 4. Influence of vertex angle values of different layout types on mirror profile and offset
Fig. 5. Design model of initial parameters for off-axis parabolic primary mirror
Fig. 8. Schematic diagram of non-blocking full flexible hinge group
Fig. 10. Deformation nephogram of optomechanical structure caused by space thermal load and gravity release
Table 1. Material properties of primary mirror components
View tableView in ArticleTable 1. Material properties of primary mirror components
Properties Materials Zerodur 4J36 Density ρ /g·cm–32.53 8.13 Poisson ratio μ 0.24 0.29 Young’s modulus E /GPa90.3 141.0 Thermal conductivity/W·(mK)–1 1.46 14.8 CTE α /(10–7 K–1)0.07 0.50
Table 2. Optomechanical design parameters for lightweight mirror
View tableView in ArticleTable 2. Optomechanical design parameters for lightweight mirror
Name PARM Value/mm Type f (rC )表示与r C相关联的参数；f (rC ,w B )表示与rC ,wB 相关联的参数Edge wall thickness t 03.5–6.5 var. Core wall thickness tC 2–4 var. Front thickness tF 5.5–7.5 var. Core wall spacing wB 55–60 var. Back thickness tB 2–4 var. Head radius rC 6.5–7.5 var. Vertex angle( SP )ΨP 50–65 (°) var. Support height 14–21 var. Mirror thickness h 026–34 var. Shank radius rS f (rC ,wB )NA Back hole diameter D 0f (rC )NA Boss depth dB 26 const. Boss section dC 10 const.
Table 3. Mirror optimization parameter value after mirror optimization iteration
View tableView in ArticleTable 3. Mirror optimization parameter value after mirror optimization iteration
PARM Optimal value/mm Adoption value/mm t 04.113 4.1 tC 2.042 2.0 tF 5.513 5.5 wB 57.722 57.7 tB 2.164 2.2 rC 6.562 6.6 ΨP 57.372 (°) 57.4 (°) hC 14.518 14.5 h 032.574 32.6 RMS 6.050 4 nm 6.060 nm Mass 1.439 kg 1.423/kg
Table 4. Dimensional parameters of Bipod components
View tableView in ArticleTable 4. Dimensional parameters of Bipod components
PARM Value range/mm ANSYS correction/mm l1 4.2–5.6 4.3 l2 /l3 8.0–9.4 9.0 l4 4.0–5.0 4.1 ti 0.9–1.1 1.0 wi 4.6–5.8 5.0 θ 029°–34° 30°
Table 5. Modal of the primary mirror system
View tableView in ArticleTable 5. Modal of the primary mirror system
Type Mode 1 2 3 4 5 Frequency/Hz 415.1 431.9 786.7 934.9 1106.7
Table 6. Mirror shape under thermal load conditions
View tableView in ArticleTable 6. Mirror shape under thermal load conditions
Parameter Space thermal load T-gradient Initial Finally Axial 1.0 K Δ x /nm6.56 2.05 <0.01 Δ y /nm0.21 0.06 <1E–4 Δ z /μm0.85 0.35 0.002 Δ θx /nrad0.09 <0.01 <0.01 Δ θy /nrad<0.01 <0.01 <0.01 Δ θz /nrad<0.01 <0.01 <0.01 PV/nm 55.40 31.40 0.27 RMS/nm 15.46 8.83 0.07
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. Structural design optimization of space gravitational wave telescope primary mirror system[J]. Infrared and Laser Engineering, 2020, 49(7): 20190469
Paper Information
Category: Optical design
Received: Apr. 7, 2020
Accepted: --
Published Online: Sep. 18, 2020
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