Non-linearities in misaligned journal bearings

Nikolakopoulos, Pantelis G.; Papadopoulos, Chris

doi:10.1016/0301-679x(94)90004-3

Cited by 36 publications

(33 citation statements)

References 8 publications

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“…Based on the existing literature on the dynamic fluid film characteristics, it is evident that most studies are limited to a few degrees of freedom. Seldom do researchers include more degrees of freedom to accurately capture effects such as journal misalignment (Pafelias (23); Pafelias and Broniarek (24); Nikolakopoulous and Papadopoulos (25)). …”

Section: Introductionmentioning

confidence: 99%

Calculation of Journal Bearing Dynamic Characteristics Including Journal Misalignment and Bearing Structural Deformation©

Ebrat

Mourelatos

Vlahopoulos

et al. 2004

Tribology Transactions

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Section: Introductionmentioning

confidence: 99%

Calculation of Journal Bearing Dynamic Characteristics Including Journal Misalignment and Bearing Structural Deformation©

Ebrat

Mourelatos

Vlahopoulos

et al. 2004

Tribology Transactions

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“…When shaft misalignment occurs due to shaft bending or shaft tilting, the film height varies over the axial direction, so Equation (2) is no longer sufficient. In Model 3, a shaft tilting description is included by adding tilting terms to the original film height description of Equation (2) [26]:…”

Section: Rotor Parametersmentioning

confidence: 99%

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

et al. 2016

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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.

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“…All of these are analytically calculated with the method presented by Nikolakopoulos and Papadopoulos [10]. In that reference, the Reynolds equation is solved by FEM for laminar and incompressible flow with constant lubricant viscosity in order to obtain:…”

Section: Stiffness and Damping Matrices Of The Bearingmentioning

confidence: 99%

“…This calculation presupposes the numerical solution of the Reynolds equation which gives the pressure distribution of the oil film [10]. The misalignment angles are also taken into consideration here, giving at the same time the flexibility of the rotor.…”

Section: Introductionmentioning

confidence: 99%

Identification of clearances and stability analysis for a rotor-journal bearing system

Papadopoulos

Nikolakopoulos

Gounaris

2008

Mechanism and Machine Theory

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Non-linearities in misaligned journal bearings

Cited by 36 publications

References 8 publications

Calculation of Journal Bearing Dynamic Characteristics Including Journal Misalignment and Bearing Structural Deformation©

Calculation of Journal Bearing Dynamic Characteristics Including Journal Misalignment and Bearing Structural Deformation©

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

Identification of clearances and stability analysis for a rotor-journal bearing system

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