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Acta Optica Sinica, Volume. 39, Issue 3, 0322001(2019)

Optimization Design of Supporting Backplate for Ultra-Light Space Camera

Mengqi Shao1,2、*, Lei Zhang1,3、*, Lin Li1,2, and Lei Wei3
Author Affiliations
  • 1 Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, Jilin 130033, China
  • 2 University of Chinese Academy of Sciences, Beijing 100049, China
  • 3 Chang Guang Satellite Technology Co. Ltd., Changchun, Jilin 130031, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (18)
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    Cited By (8)
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    Figures & Tables(18)
    Model of primary mirror

    Fig. 1. Model of primary mirror

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    Flexible supporting part

    Fig. 2. Flexible supporting part

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    Boundary dimension parameters of backplate

    Fig. 3. Boundary dimension parameters of backplate

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    Connection between backplate and other structures

    Fig. 4. Connection between backplate and other structures

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    Finite element models of initial structure of backplate. (a) Initially designed finite element model; (b) initial structure finite element model of constraint

    Fig. 5. Finite element models of initial structure of backplate. (a) Initially designed finite element model; (b) initial structure finite element model of constraint

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    Iterative convergence curve

    Fig. 6. Iterative convergence curve

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    (a) Topological optimization result of initial structure of backplate; (b) processed backplate model

    Fig. 7. (a) Topological optimization result of initial structure of backplate; (b) processed backplate model

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    Parameter variables of supporting backplate structure

    Fig. 8. Parameter variables of supporting backplate structure

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    Procedure of optimization iteration

    Fig. 9. Procedure of optimization iteration

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    Supporting backplate model after optimization. (a) Obverse side; (b) reverse side

    Fig. 10. Supporting backplate model after optimization. (a) Obverse side; (b) reverse side

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    Displacement cloud image of mirror surface

    Fig. 11. Displacement cloud image of mirror surface

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    First order intrinsic mode shape of mirror assembly

    Fig. 12. First order intrinsic mode shape of mirror assembly

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    • Table 1. Performance parameters and comprehensive quality factors of commonly used spatial structural materials

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      Table 1. Performance parameters and comprehensive quality factors of commonly used spatial structural materials

      MaterialDensity /(g·cm-3)Elasticity modulus /GPaThermal conductivity /(W·m-1·K-1)Coefficient of linear expansion /(106 m·℃-1)Specific stiffness /(N·tex-1)Thermostability /(106 W·m-2)Quality factor
      Al2.7068167.0022.5025.197.42186.97
      Ti4.401147.409.1025.910.8121.07
      MgAl1.8040201.0025.0022.228.04178.65
      4J32 invar alloy8.9014113.700.6515.8421.08333.86
      35%SiC/Al3.00100155.0016.0033.339.69322.88
      55%SiC/Al2.94213235.008.0072.4029.382126.75
      SiC3.20400155.002.40125.0064.588072.92

    • Table 2. Designed variables and optimized results

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      Table 2. Designed variables and optimized results

      VariableRange /mmInitial value /mmOptimization result /mm
      Bh[2,4]3.02.0
      H[9,13]13.59.6
      Tc[2,4]5.02.2
      Tic[2,4]3.02.2
      TL1[2,4]5.02.1
      TL2[2,4]5.02.5

    • Table 3. Surface analysis and accuracy comparison

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      Table 3. Surface analysis and accuracy comparison

      LoadFace shape precision
      RMS /nmPeak to valley /nm
      25℃0.1580.781
      FX1.1695.403
      FZ4.06917.620
      FX+25 ℃1.2216.181
      FZ+25 ℃3.95318.190

    • Table 4. First three order modal information of mirror assembly

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      Table 4. First three order modal information of mirror assembly

      Swing around Z axis /HzVibration along X axis /HzVibration along Y axis /HzMass of supporting backplate /kg
      3974094100.591

    • Table 5. Conditions of random vibration test

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      Table 5. Conditions of random vibration test

      ParameterDirection along XDirection along YDirection along Z
      Frequency range /Hz10-8080-800800-2000
      Power spectral density /(g2·Hz-1)+3 dB/oct0.01-6 dB/oct
      Root-mean-square(RMS)3.56g

    • Table 6. Analysis result of random response

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      Table 6. Analysis result of random response

      DirectionXYZ
      Result of random vibration analysis(RMS)10.98g10.91g15.45g
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    Mengqi Shao, Lei Zhang, Lin Li, Lei Wei. Optimization Design of Supporting Backplate for Ultra-Light Space Camera[J]. Acta Optica Sinica, 2019, 39(3): 0322001

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    Paper Information

    Category: Optical Design and Fabrication

    Received: Jun. 12, 2018

    Accepted: Oct. 30, 2018

    Published Online: May. 10, 2019

    The Author Email:

    DOI:10.3788/AOS201939.0322001

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology