Infrared and Laser Engineering, Volume. 51, Issue 5, 20210364(2022)
Structure design and stiffness analysis of spaceborne two-dimensional turntable
Figures & Tables(21)
Fig. 3. Schematic diagram of part components of the optical machine structure
Fig. 5. Schematic of design variables of two back lightweight form tip-tilt mirrors
Fig. 10. Simplified local finite element model of angular contact ball bearing
Table 1. Design requirements of two-dimensional turntable
View tableView in ArticleTable 1. Design requirements of two-dimensional turntable
Parameter Index Clear aperture/mm 183×220 Total weight/kg <12 Resonant frequency/Hz >120 Surface precision ${\rm{{RMS }{_{G{{rav}}} } } } \leqslant \lambda /30$ ${{\rm{{RMS} }{_{Temp}}} } \leqslant \lambda /40$ Horizontal tracking range/(°) $0-300$ Vertical tracking range/(°) 45±5 Operating temperature/℃ 20±5
Table 2. Structural material properties of hole tip-tilt mirror assembly
View tableView in ArticleTable 2. Structural material properties of hole tip-tilt mirror assembly
Material Density/g·cm−3 Young`s modulus/GPa Poisson`s ratio SiC 3.21 446 0.21 Invar 7.98 141 0.3 TC4 4.45 117 0.33
Table 3. Design variables and optimal results
View tableView in ArticleTable 3. Design variables and optimal results
Variables Domain Result-Ⅰ Result-Ⅱ Ft [2,5] 2.1 2.0 Ht [3,7] 5.5 6.9 St [2,6] 3.2 2.3 Rt1 [2,6] 5.9 5.4 Rt2 [2,6] 2.6 3.8 R t3 [2,6] 4.0 2.1 R t4 [2,6] 3.4 2.2 Rt5 [2,6] 3.4 - Rt6 [2,6] 3.2 - h1 [−7,−3] −2.1 −5 h2 [−15,−8] −8.1 - h3 [−20,−10] −18.3 −10.4 h4 [−28,−20] −26.7 −26.4 Freq1 - 355 408 RMSX - 1.793 0.175 RMSY - 10.62 6.603 RMST5 - 0.33 1.2 Mass - 0.95 1.2
Table 4. Analysis results of three different U-shaped frame materials
View tableView in ArticleTable 4. Analysis results of three different U-shaped frame materials
Material Mass/kg Modal 1st 2nd 3rd LY12 1.598 446 696 806 AZ41M 1.010 430 675 795 TC4 2.628 439 689 798
Table 5. Angular contact bearing and deep groove ball bearing stiffness calculation results
View tableView in ArticleTable 5. Angular contact bearing and deep groove ball bearing stiffness calculation results
Name Stiffness/N·mm−1 Ka Kr 71802 $4.579\;9 \times {10^4}$ $3.084\;4 \times {10^5}$ 61802 - $2.570\;7 \times {10^5}$ 71908 $2.367\;3 \times {10^5}$ $7.509\;3 \times {10^5}$ 61902 - $3.104\;3 \times {10^5}$
Table 6. Modal analysis results of two-dimensional turntable
View tableView in ArticleTable 6. Modal analysis results of two-dimensional turntable
Orientation Frequency/Hz Mode description Modal shape X 115.5 Vibration along Xaxis Fig.12(a) Y 235.8 Rotate around X axis Fig.12(b) Z 369.8 Rotate around Z-axis Fig.12(c)
Table 7. Mechanics test results and simulation errors of two-dimensional turntable
View tableView in ArticleTable 7. Mechanics test results and simulation errors of two-dimensional turntable
Orientation Experiment FEA Relative error X 111.9 115.5 3.6% Y 222.74 235.8 5.9% Z 351.3 369.8 5.3%
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Tao Qin, Junli Guo, Meili Zhang, Peixian Han, Jin Wang, Bo Qi. Structure design and stiffness analysis of spaceborne two-dimensional turntable[J]. Infrared and Laser Engineering, 2022, 51(5): 20210364
Paper Information
Category: Photoelectric measurement
Received: Dec. 25, 2021
Accepted: --
Published Online: Jun. 14, 2022
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