大口径空间红外相机铍铝合金反射镜组件材料选择与设计 下载: 523次
Material selection and design of beryllium-aluminum alloy mirror assembly for large-diameter space infrared camera
1 长春理工大学 光电工程学院,吉林 长春 130022
2 中国科学院长春光学精密机械与物理研究所,吉林 长春 130033
图 & 表
图 1. 主镜轻量化结构
Fig. 1. Lightweight structure of scanning mirror
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图 2. 柔性支撑结构图
Fig. 2. Flexible support structure
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图 3. 主镜室结构图
Fig. 3. Room structure of main mirror
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图 4. 摆动部件结构图
Fig. 4. Structure of swing part
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图 5. 模拟反射镜加工面型图
Fig. 5. Simulated mirror processing surface pattern
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表 1常用空间相机反射镜材料属性表
Table1. Performance parameters of common space camera mirror material
Mirror material | Density ρ/g·cm−3 | Elastic modulus, E/GPa
| Expansion coefficient/K | Conductivity, λ /W·m−1·K−1 | Beryllium | 1.85 | 287 | 11.3×10−6 | 216 | AlBe alloy | 2.1 | 190 | 13.9×10−6 | 212 | CeSiC | 3.04 | 330 | 2.4×10−6 | 170 | Zerodure | 2.53 | 92 | −0.09×10−6 | 1.6 | ULE | 2.21 | 67 | 0.015×10−6 | 1.3 |
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表 2空间光学系统常用轻质材料属性表
Table2. Performance parameters of common space optical system lightweight material
Flexible structure material | Density ρ/g·cm−3 | Elastic modulu, E/GPa
| Expansion coefficient /K | Specific stiffness, E/ρ/m3 | Aluminum alloy | 2.7 | 68 | 22.5×10−6 | − | AlBe alloy | 2.1 | 190 | 13.9×10−6 | 9.5×10−6 | Titanium | 4.4 | 106.8 | 8.8×10−6 | 2.53 | CeSiC | 3.04 | 330 | 2.4×10−6 | − | Al-Si/20SiLp | 2.8 | 100 | 16×10−6 | 3.3×10−6 | Al-Si/65SiLp | 2.96 | 180 | 8.0×10−6 | 6.0×10−6 |
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表 3全口径范围内三向重力与15 ℃温度变化引起的主镜面形误差
Table3. Errors of main mirror surface with 15 ℃ temperature change and three-dimensional gravity in a full-aperture range
Forces | GX+△T15 ℃
| GY+△T15 ℃
| GZ+△T15 ℃
| RMS/nm | 14.77 | 17.04 | 14.16 |
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表 4主镜组件前三阶自然频率
Table4. The first three order natural frequency of primary mirror part
Modal | Frequency/Hz | First order | 299 | Second order | 300 | Third order | 387 |
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表 5摆动部件在约束状态下的模态分析结果
Table5. Modal analysis result of swing part in the constrainted condition
Modal | First order | Second order | Third order | Frequency of swing part/Hz | 122 | 284 | 287 |
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表 6全口径范围内三向重力与15 ℃温度变化引起的主镜、次镜面形误差
Table6. Errors of main mirror and second mirror surface with 15 ℃ temperature change and three-dimensional gravity in a full-aperture range
Forces | GX+△T15 ℃
| GY+△T15 ℃
| GZ+△T15 ℃
| RMS of the main mirror/nm | 16.02 | 18.66 | 16.02 | RMS of the second mirror/nm | 16.42 | 13.44 | 18.09 |
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表 7摆动部件第一次力学试验结果
Table7. First time mechanical test results of slewing part
Direction | X | Y | Z | Fn/Hz
| 118 | 280 | 282 |
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表 8摆动部件力学试验结果
Table8. Mechanical test results of slewing part
Direction | X | Y | Z | Fn/Hz
| 118 | 277.8 | 278.2 |
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翟岩, 姜会林, 梅贵, 江帆. 大口径空间红外相机铍铝合金反射镜组件材料选择与设计[J]. 红外与激光工程, 2020, 49(6): 20190390. Zhai Yan, Jiang Huilin, Mei Gui, Jiang Fan. Material selection and design of beryllium-aluminum alloy mirror assembly for large-diameter space infrared camera[J]. Infrared and Laser Engineering, 2020, 49(6): 20190390.