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Monday, July 8 • 17:30 - 17:50
BEARING GEOMETRIC IMPERFECTIONS EFFECTS ON THE RUB-IMPACT BEHAVIORS OF A ROTOR-BEARING SYSTEM

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A rotor-bearing systems experiences rub-impact in its bearing supports due to different faults such as excessive unbalance and contact between the journal and the bearing in low speeds during run up/downs. Changes in geometry of bearings may appear during its service life and consequently, these geometric imperfections lead to changes in the dynamic behaviors of the system especially on its rub-impact characteristics. Safe operation of the rotating system necessitates the detection of the rub-impact inside the journal bearing in its early stages. In this paper, nonlinear analysis of a rotor-bearing system is implemented to investigate the effects of the bearing geometry imperfections and the rub-impact in its journal bearings on the rotor-bearing system dynamic behaviors. To do so, each supporting bearing is considered to operate in mixed lubrication regime as the contact occurs between the journal and the bearing. Also, the surfaces of the journal and the bearings are assumed to be rough; the asperity contact model developed by Greenwood-Williamson is used to simulate the metal-to-metal contact between the journal and the bearing and average Reynolds equation is solved by finite element method to obtain hydrodynamic pressure distribution. Employing the developed model, this paper considers the effects of bearing geometry imperfection due to wear abrasion on the journal equilibrium position, hydrodynamic pressure distributions and the system dynamic response. It is observed that such a nonlinear dynamic analysis provides useful tools for diagnosis of rub-impact and detection of any changes in the bearing geometry.​


Monday July 8, 2019 17:30 - 17:50 EDT
Outremont 7
  T07 Struct. dyn. & nonlin. vib., RS04 Rotordynamics