Infrared and Laser Engineering, Volume. 50, Issue 5, 20210007(2021)
Design and verification of four auxiliary support points by heat lock for large aperture off-axis mirror
Figures & Tables(17)
Fig. 4. Surface shape analysis of the primary mirror under gravity
Fig. 10. Surface shape change of the primary mirror component with uniform temperature rise of 1 ℃
Table 1. Simulation data sheet of gum spot stress in three directions supported by the center
View tableView in ArticleTable 1. Simulation data sheet of gum spot stress in three directions supported by the center
X Y Z 1 g gravity load Stress of glue spot 0.143 MPa Stress of glue spot 0.172 MPa Stress of glue spot 0.19 MPa 30 g static load 4.29 MPa 5.16 MPa 5.7 MPa does not meet the requirement of less than 3 MPa
Table 2. Table of parameters of the center support structure
View tableView in ArticleTable 2. Table of parameters of the center support structure
Parameter Distribution diameter of center barrel mounting hole Thickness of center tube/mm Thickness of mounting flange of center cylinder/mm Thickness of the glue spots/mm Glue spot size/mm Area of the gum spot/mm2 Data Φ138 5 7 0.1 Φ32 8591
Table 3. Modal analysis table for primary mirror assembly (including hot lock)
View tableView in ArticleTable 3. Modal analysis table for primary mirror assembly (including hot lock)
Modal First order mode Second order mode Third mode Fourth mode Fifth mode Six mode Data 227.7 Hz 269.6 Hz 273.3 Hz 332.1 Hz 475.8 Hz 478.1 Hz
Table 4. Simulation data table of three directions of adhesive spot stress (including thermal lock)
View tableView in ArticleTable 4. Simulation data table of three directions of adhesive spot stress (including thermal lock)
X Y Z 1 g gravity load Stress of glue spot 0.094 MPa Stress of glue spot 0.092 MPa Stress of glue spot 0.0885 MPa 30 g static load 2.847 MPa 2.766 MPa 2.655 MPa It meets the design requirements of less than 3 MPa, and the stress state of the adhesive layer is effectively improved
Table 5. Weight data table of primary mirror assembly
View tableView in ArticleTable 5. Weight data table of primary mirror assembly
Material Weight/kg Primary mirror SiC 16.7 （Lightweight：74%） Central cylinder 4J32 1.81 4 hot lock assembly 4J32, Al alloy 1.28 Support backplane SiC/C 18.51 Total weight 38.3
Table 6. Surface data table of primary mirror assembly
View tableView in ArticleTable 6. Surface data table of primary mirror assembly
Experimental stage After assembly After locking and unlocking the hot lock for many times After vibration test Data
Table 7. Table of mechanical test data of primary mirror assembly
View tableView in ArticleTable 7. Table of mechanical test data of primary mirror assembly
X Y Z Sinusoidal response curve 0.2 g sweep curve
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Chunyu Wang, Ruimin Fu, Cong Wang, Jinchuan Niu, Chao Zhang, Yinglong Zhao, Shengjie Zhang, Yang Huang, Chengguang Cui. Design and verification of four auxiliary support points by heat lock for large aperture off-axis mirror[J]. Infrared and Laser Engineering, 2021, 50(5): 20210007
Paper Information
Category: Optical design
Received: Jan. 4, 2021
Accepted: --
Published Online: Aug. 13, 2021
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