Dynamic characteristics of tilting pad journal bearing-rotor system considering pad wear

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (11) : 255-263.

ZHANG Chaodong1,2, YU Wennian1,2, ZHANG Lu1,3

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Abstract

Aiming at coupling modeling of lubrication and vibration characteristics for tilting pad journal-rotor systems with pad wear fault, an original mixed-lubrication dynamic model for the tilting pad journal bearing-rotor system is proposed considering the effects of pad wear, rotor and pad horizontal-rocking vibrations, and bearing mixed lubrication. The dynamic responses of the rotor vibration and the bearing lubrication under different wear rates are studied. The effects of different parameters (rotor eccentricity, rotating speed and preload factor, etc.) on the dynamic characteristics of the tilting pad journal bearing-rotor system with worn pads are evaluated. Compared to the bearing without worn pads, the acceleration peak frequency of the rotor for the bearing with worn pads excites the additional even harmonics of the rotating frequency. The occurrence of multi-pad wear can cause a significant increase in the vibration response of the rotor and the oil film pressure of the bearing. These results provide a theoretical basis for condition monitoring and fault identification of tilting pad bearing and rotor systems.

Key words

tilting pad journal bearing-rotor system / pad wear / dynamic characteristic / mixed-lubrication dynamic

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ZHANG Chaodong1,2, YU Wennian1,2, ZHANG Lu1,3. Dynamic characteristics of tilting pad journal bearing-rotor system considering pad wear[J]. Journal of Vibration and Shock, 2024, 43(11): 255-263

References

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