Infrared and Laser Engineering, Volume. 51, Issue 5, 20210710(2022)
Application of C/SiC to secondary mirror bearing cylinder in large aperture space telescope
Figures & Tables(13)
Fig. 2. First order vibration model of the structure with two schemes
Fig. 6. Frequency sweep curve before and after vibration. (a)
Table 1. Properties of alternative materials
View tableView in ArticleTable 1. Properties of alternative materials
Sample name TC4 Invar C/SiC Density/kg·m-3 4.4×103 8.18×103 2.4×103 Tensile modulus/GPa 114 150 110 Thermal conductivity/ W·(m·K)−1 8.8 1.47 4.6 Linear expansion coefficient/K−1 8.9×10−6 0.55×10−6 2×10−6
Table 2. Natural frequencies of the structure with two schemes
View tableView in ArticleTable 2. Natural frequencies of the structure with two schemes
Sample name TC4 C/SiC 1st natural frequency/Hz 183 204 2nd natural frequency/Hz 236 253 3rd natural frequency/Hz 237 254 4th natural frequency/Hz 284 335
Table 3. Influence of uniform temperature rise on the surface shape
View tableView in ArticleTable 3. Influence of uniform temperature rise on the surface shape
Name RMS wavefront Image TC4 4.53 nm C/SiC 4.01 nm
Table 4. Physical properties of the sample
View tableView in ArticleTable 4. Physical properties of the sample
Name C/SiC Density/kg·m−3 2.31×103 Tensile modulus/GPa 118.6 Thermal conductivity/W·(m·K)−1 4.95 Linear expansion coefficient/K−1 1.72×10−6
Table 5. Structure measurement before and after vibraton
View tableView in ArticleTable 5. Structure measurement before and after vibraton
Sample name Before vibration /mm After vibration /mm Amount of change /mm b 0.0265 0.0291 0.0026 c 0.1283 0.1299 0.0016 d 0.0108 0.0173 0.0065 e 0.1153 0.1182 0.0029 H 405.0046 404.9927 −0.0119 h 178.3791 178.3694 −0.0097
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Shicheng Cui, Zhiqing Song, Jukui Yang. Application of C/SiC to secondary mirror bearing cylinder in large aperture space telescope[J]. Infrared and Laser Engineering, 2022, 51(5): 20210710
Paper Information
Category: Optical design
Received: Sep. 26, 2021
Accepted: --
Published Online: Jun. 14, 2022
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