Abstract
Gear-shaft-bearing systems are commonly used in transmission mechanisms of modern industry. Because of the coupling relationship of the gear pair system and the bearing system, complex vibration signals will be generated when there are localized defects on the transmission system, which makes the defect diagnosis more difficult. Thus, for explaining the vibration signals, a model of gear-shaft-bearing coupling system with 36 DOFs is established. In the proposed model, the model of gear pair with spalling defects and the model of ball bearing with localized defects are combined, and the center distance error and misalignment of the shafts caused by the displacement of bearings’ inner raceways are used as a connection, then the coupling relationship between the gear pair system and the bearing system is established, and the changing laws of the meshing stiffness are studied. The results show that the decrease of meshing stiffness will also be excited by the center distance error and the misalignment angle caused by system vibration. And when there are localized defects on the gear and bearing, the sudden change of actual center distance and misalignment angle will be caused, which results in a further reduction in the meshing stiffness of the gear pair as the failure zone is loaded and a short time after the failure zone. There are obvious signs of the coupling relationship between gears and bearings on the vibration spectrogram of the gear-shaft-bearing. When there is a single defect on the gear pair or bearing, the defect frequencies of the gear pair and bearing can be found at the same time on the spectrogram. Finally, the established model and the analysis of the results are verified by experiments. The established model is closer to engineering practice, and it provides a theoretical basis for fault diagnosis of rotating machinery.
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Acknowledgements
The work described in this paper was fully supported by a grant from the National Natural Science Foundation of China (No. 51905001), Wuhu Science and Technology Projects (No. 2020yf53), and Scientific Research Project of Anhui Polytechnic University (No. Xjky019201904).
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Dai, P., Wang, J., Yan, S. et al. Effects of Localized Defects of Gear-Shaft-Bearing Coupling System on the Meshing Stiffness of Gear Pairs. J. Vib. Eng. Technol. 10, 1153–1173 (2022). https://doi.org/10.1007/s42417-022-00435-w
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DOI: https://doi.org/10.1007/s42417-022-00435-w