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空间相机全铝合金光机结构的设计与分析

王上 张星祥 朱俊青

王上, 张星祥, 朱俊青. 空间相机全铝合金光机结构的设计与分析[J]. 红外技术, 2022, 44(4): 364-370.
引用本文: 王上, 张星祥, 朱俊青. 空间相机全铝合金光机结构的设计与分析[J]. 红外技术, 2022, 44(4): 364-370.
WANG Shang, ZHANG Xingxiang, ZHU Junqing. Design and Analysis of All Aluminum Alloy Optical Mechanical Structure of Space Cameras[J]. Infrared Technology , 2022, 44(4): 364-370.
Citation: WANG Shang, ZHANG Xingxiang, ZHU Junqing. Design and Analysis of All Aluminum Alloy Optical Mechanical Structure of Space Cameras[J]. Infrared Technology , 2022, 44(4): 364-370.

空间相机全铝合金光机结构的设计与分析

基金项目: 

装备演示验证项目 E03671SZU0

详细信息
    作者简介:

    王上(1996-),男,硕士研究生,主要从事光机结构设计。E-mail:ws790402497@163.com

    通讯作者:

    张星祥(1977-),男,博士,研究员,主要从事空间宽幅成像技术、精密装调与拼接技术、在轨测试与处理技术方面的研究。E-mail:jan_zxx@163.com

  • 中图分类号: V445.8

Design and Analysis of All Aluminum Alloy Optical Mechanical Structure of Space Cameras

  • 摘要: 提高光机结构的温度适应性对空间相机降低热控难度、提升系统稳定性具有重要意义。根据统一材料结构可以消除系统热差的原理,选用铝合金材料对某可见光波段空间相机的光机结构进行了设计,并完成了实际工况下的工程分析,达到了在20℃±15℃均匀温度变化与不同方向重力耦合状态下,像质均满足MTF(modulation transfer function)在71.4 lp/mm处大于0.3的成像指标。采取常用的不同材料搭配方案进行对比分析,相同工况的全铝结构稳定性远优于不同材料方案,验证了统一材料的光机结构在温度适应性方面的优势。
  • 图  1  同轴双反光学系统

    Figure  1.  Coaxial double mirror optical system

    图  2  等效高斯光学系统

    Figure  2.  Equivalent Gaussian optical system

    图  3  光学设计方案

    Figure  3.  Optical design scheme

    图  4  MTF曲线

    Figure  4.  Curves of the MTF

    图  5  一体化铝合金主镜结构

    Figure  5.  Integrated aluminum alloy primary mirror structure

    图  6  整体光机结构图

    Figure  6.  Overall optical and mechanical structure

    图  7  梯度温度分布

    Figure  7.  Gradient temperature distribution

    图  8  对比方案的结构形式

    Figure  8.  Structure of the comparison plans

    图  9  碳化硅主镜

    Figure  9.  SiC primary mirror

    图  10  支撑结构为高体份的MTF曲线

    Figure  10.  MTF curves of SiCp/AL-HT8 support structure

    图  11  支撑结构为钛合金的MTF曲线

    Figure  11.  MTF curves of TC4 support structure

    表  1  全铝结构方案材料属性

    Table  1.   Material properties of all aluminum structure plan

    Material Density/(g·cm−3) Young's modulus/GPa Thermal conductivity/(W·m−1·℃−1) Coefficient of thermal expansion/(10−6·℃−1) Poisson's ratio
    Al6061 2.7 71 154.3 22.4 0.25
    HK9L 2.51 82 1.1 7.1 0.21
    下载: 导出CSV

    表  2  不同工况下的对比分析

    Table  2.   Comparative analysis under different working conditions

    Working condition Temperature Load +15℃ +15℃ - - +15℃ +15℃
    Gravity Load - - Axial Radial Axial Radial
    Constraints Free Fixed Fixed Fixed Fixed Fixed
    Results Δx/mm 4.75e−5 −4.08e−5 −5.62e−7 5.25e−5 −4.32e−5 6.61e−6
    Δy/mm 4.74e−5 4.98e−5 6.25e−6 −5.59e−4 7.92e−5 −4.86e−4
    Δz/mm −3.09e-2 −3.09e-2 −2.15e−4 5.88e−7 −3.10e-2 −3.08e−2
    M1 surface RMS/nm 3.178 23.955 4.103 8.024 25.028 27.576
    M2 surface RMS/nm 1.983 1.964 0.592 0.053 2.108 1.984
    MTF min 0.463 0.327 0.451 0.436 0.326 0.303
    下载: 导出CSV

    表  3  梯度温度场中系统参数变化

    Table  3.   Variation of system parameters in gradient temperature field

    ΔT/℃ 5 6 7 8 9
    Main mirror surface change RMS/nm 18.490 22.144 25.835 29.526 33.215
    Secondary mirror surface change RMS/nm 1.246 1.508 1.757 2.010 2.259
    MTF min 0.378 0.345 0.308 0.269 0.228
    下载: 导出CSV

    表  4  对比方案的两种材料搭配方式

    Table  4.   Two material matching methods of the comparison scheme

    Plans Reflector Lens Supporting structure Connector Weight/kg
    Plan 1 SiC HK9L SiCp/AL-HT8 Invar 1.85
    Plan 2 SiC HK9L ZTC4 Invar 2.36
    下载: 导出CSV

    表  5  对比方案中材料属性

    Table  5.   Material properties in comparison scheme

    Material Density/(g·cm−3) Young's modulus/GPa Thermal conductivity/ (W·m−1·℃−1) Coefficient of thermal expansion/(10−6·℃−1) Poisson's ratio
    Invar 8.1 141 13.9 0.05-7.5 0.25
    SiC 3.05 33. 185 2.5 0.2
    SiCp/AL-HT8 2.94 180 190 8 0.23
    ZTC4 4.44 114 8.8 8.9 0.29
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-02-07
  • 修回日期:  2021-02-20
  • 刊出日期:  2022-04-20

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