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Research on Deformation of Shock Absorber of SINS Under Vibration and Impingement
CHENG Yaoqiang, ZHU Qiju, ZHAO Zhiyuan, SUN Mingyao, YANG Pengxiang
JPRMG ›› 2024, Vol. 44 ›› Issue (2) : 36-41.
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Research on Deformation of Shock Absorber of SINS Under Vibration and Impingement
({{custom_author.role_en}}), {{javascript:window.custom_author_en_index++;}}For the shock absorber, the traditional research focuses mainly on the vibration damping effect, material life, etc., but pays less attention to the navigation error brought by its strain and deformation, and too much emphasis is placed on the theoretical research without the support of experimental data, which is lack of persuasiveness,in this paper,static and dynamic measurement schemes are developed based on the design of shock absorber of strap-down inertial navigation system(SINS). Firstly, a pair of plane mirrors which is perpendicular to each other is fixed on the vibration fixture. And then SINS is installed on the vibration fixture through shock absorbers. Finally, four devices of optical projection and imaging are set up to record the reflected light spots of SINS and plane mirrors before and after the vibration and impingement. Through the calculation of the displacement change of light spots, deformation of shock absorber is determined. The results show that the maximum angle of deformation of SINS caused by shock absorber deformation is 6.26″,which is far lower than installation error stability (generally less than 1.0') between SINS and carrier. The spatial deformation of the shock absorber has a small effect on the navigation error of SINS. The test scheme and measured dates in this paper can be as reference for design and application of SINS shock absorber.
shock absorber / deformation / vibration and impingement / SINS {{custom_keyword}} /
Table 1 Deformation of the shock absorber before and after vibration and impingement表1 振动冲击前后减振器形变量 |
| Number of shock absorber | l1/mm | l2/mm | Δl/μm |
|---|---|---|---|
| 1 | 6.452 | 6.454 | 2 |
| 2 | 6.449 | 6.450 | 1 |
| 3 | 6.451 | 6.449 | 2 |
| 4 | 6.450 | 6.450 | 0 |
Table 2 Displacement change of light spots before and after Y-axis mechanical test表2 Y轴力学试验前后光斑位移情况 |
| Number of light spot | Displacement change/mm |
|---|---|
| 1 | 0.10(vertical down) |
| 2 | 0.00 |
| 3 | 0.15(vertical down) |
| 4 | 0.00 |
Table 3 Displacement change of light spots before and after X-axis mechanical test表3 X轴力学试验前后光斑位移情况 |
| Number of light spot | Displacement change/mm |
|---|---|
| 1 | 0.00 |
| 2 | 0.15(horizontal movement) |
| 3 | 0.15(horizontal movement) |
| 4 | 0.00 |
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Fig.1 Schematic diagram of four sets of T-type shock absorbers mounted on SINSFig.2 Random vibration test curve of SINSFig.3 Impingement test curve of SINSFig.4 Vibration tooling for testingFig.5 Physical picture of optical projection and imaging equipmentFig.6 Dynamic test schematic diagram
Table 1 Deformation of the shock absorber before and after vibration and impingementTable 2 Displacement change of light spots before and after Y-axis mechanical testTable 3 Displacement change of light spots before and after X-axis mechanical test/
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