Abstract
The randomness of the shaft current damage on the bearing raceway results in a certain inclination of the damage. To accurately characterize inclined shaft current damage, a mathematical model of inclined shaft current damage is proposed, and a dynamic model of shaft-bearing-pedestal (SBP) coupled system with inclined shaft current damage is proposed. Then, the practicability of the model is verified by the experimental measurement results. Finally, the influence of inclination degree of shaft current damage, length of damage, load, and rotating speed on the dynamic performance of the SBP coupled system is analyzed. The results show that the introduction of an inclination angle makes the vibration response of the SBP coupled system significantly enhanced. As the inclination angle of the shaft current damage on the bearing inner or outer ring changes from 90° to 15°, the SBP coupled system gradually transits from stable quasi-periodic motion to chaotic motion. With the increase of rotating speed, the number and amplitude of closed loops of the phase diagram track increase gradually, and the increase of speed further worsens the motion state of the SBP coupled system.
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This research is sponsored by the National Key Research and Development Program of China (2020YFB2007802), and the Fundamental Research Funds for the Central Universities (N2103025).
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Li, F., Li, X., Liu, J. et al. Nonlinear vibration analysis of the shaft-bearing-pedestal coupled system with inclined shaft current damage. Nonlinear Dyn 111, 15853–15872 (2023). https://doi.org/10.1007/s11071-023-08677-3
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DOI: https://doi.org/10.1007/s11071-023-08677-3