Print Email Facebook Twitter Towards accurate prediction of unbalance response, oil whirl and oil whip of flexible rotors supported by hydrodynamic bearings Title Towards accurate prediction of unbalance response, oil whirl and oil whip of flexible rotors supported by hydrodynamic bearings Author Eling, R.P.T. (TU Delft Mechatronic Systems Design; Mitsubishi Turbocharger and Engine Europe) te Wierik, M. (Mitsubishi Turbocharger and Engine Europe) van Ostayen, R.A.J. (TU Delft Mechatronic Systems Design) Rixen, D.J. (Technische Universität München) Date 2016 Abstract Journal bearings are used to support rotors in a wide range of applications. In order to ensure reliable operation, accurate analyses of these rotor-bearing systems are crucial. Coupled analysis of the rotor and the journal bearing is essential in the case that the rotor is flexible. The accuracy of prediction of the model at hand depends on its comprehensiveness. In this study, we construct three bearing models of increasing modeling comprehensiveness and use these to predict the response of two different rotor-bearing systems. The main goal is to evaluate the correlation with measurement data as a function of modeling comprehensiveness: 1D versus 2D pressure prediction, distributed versus lumped thermal model, Newtonian versus non-Newtonian fluid description and non-mass-conservative versus mass-conservative cavitation description. We conclude that all three models predict the existence of critical speeds and whirl for both rotor-bearing systems. However, the two more comprehensive models in general show better correlation with measurement data in terms of frequency and amplitude. Furthermore, we conclude that a thermal network model comprising temperature predictions of the bearing surroundings is essential to obtain accurate predictions. The results of this study aid in developing accurate and computationally-efficient models of flexible rotors supported by plain journal bearings. Subject fluid film bearingplain journal bearingLaval rotorwhirlwhipshort bearingcavitationcritical speedmodeling comprehensiveness To reference this document use: http://resolver.tudelft.nl/uuid:61c1a3ad-5cab-47de-92db-23bb4af12d45 DOI https://doi.org/10.3390/lubricants4030033 ISSN 2075-4442 Source Lubricants, 4 (3), 1-18 Part of collection Institutional Repository Document type journal article Rights © 2016 R.P.T. Eling, M. te Wierik, R.A.J. van Ostayen, D.J. Rixen Files PDF lubricants_04_00033.pdf 4.51 MB Close viewer /islandora/object/uuid%3A61c1a3ad-5cab-47de-92db-23bb4af12d45/datastream/OBJ/view