Shuangquan YANG, Shulin DONG, Ning JIN, Zirong WANG, Kaiyu YANG, Jing LI, Dan YANG, Man XU. Mechanism analysis of the influence of changes in pretension of screws on the optical axis stability of infrared imagers[J]. Infrared and Laser Engineering, 2024, 53(8): 20240197
- Infrared and Laser Engineering
- Vol. 53, Issue 8, 20240197 (2024)
Fig. 1. (a) Geometric model; (b) Grid division; (c) Load and boundary condition settings
Fig. 2. (a) Normal stress of screw cross-section (T =2000 N ·mm); (b) Comparison of theoretical and simulation results of pretension for screwed joints
Fig. 3. (a) Stress distribution; (b) The maximum stress change in the cross-section of the first contact screw tooth; (c) Change in pretension of screws; (d) Change in screw rotation angle
Fig. 4. (a) Schematic diagram of the composition of the mirror subassembly; (b) Contact geometric feature correction
Fig. 5. (a) Deformation cloud map of the mirror base; (b) Deformation cloud map of the mirror
Fig. 6. (a) Cloud map of mirror surface deformation when the pretension of the screws H, I, J, and K on the mirror base is reduced to 1000 N; (b) Cloud map of mirror surface deformation when the pretension of the screws B, C, D, E, F, and G for the mirror is reduced to 1000 N
Fig. 7. (a) Cloud map of mirror surface deformation when the installation screw J of the mirror base is completely loose; (b) Cloud map of mirror surface deformation when the installation screw B of the mirror is completely loose
Fig. 8. Experimental testing system
Fig. 9. Experimental test result
Fig. 10. Impact of screw type
Fig. 11. Impact of thread friction coefficient
Fig. 12. Impact of frictional resistance on support surface
Fig. 13. Equivalent simulation model for thread dispensing
Fig. 14. Impact of thread dispensing
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