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Lubricants 2016, 4(3), 33; doi:10.3390/lubricants4030033

Towards Accurate Prediction of Unbalance Response, Oil Whirl and Oil Whip of Flexible Rotors Supported by Hydrodynamic Bearings

1
Precision and Microsystems Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands
2
Research and Development, Mitsubishi Turbocharger and Engine Europe, Damsluisweg 2, 1332 EC Almere, The Netherlands
3
Institute of Applied Mechanics, Technische Universität München, 85748 Garching, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: James E. Krzanowski
Received: 31 May 2016 / Revised: 25 August 2016 / Accepted: 5 September 2016 / Published: 8 September 2016
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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. View Full-Text
Keywords: fluid film bearing; plain journal bearing; Laval rotor; whirl; whip; short bearing; cavitation; critical speed; modeling comprehensiveness fluid film bearing; plain journal bearing; Laval rotor; whirl; whip; short bearing; cavitation; critical speed; modeling comprehensiveness
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Eling, R.; te Wierik, M.; van Ostayen, R.; Rixen, D. Towards Accurate Prediction of Unbalance Response, Oil Whirl and Oil Whip of Flexible Rotors Supported by Hydrodynamic Bearings. Lubricants 2016, 4, 33.

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