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Alternation of the dynamic coefficients of short journal bearings due to wear

Michael G. Papanikolaou (Department of Engineering Physics, Cranfield University, Cranfield, United Kingdom.)
Michael G. Farmakopoulos (Department of Mechanical Engineering & Aeronautics, University of Patras, Patras, Greece.)
Chris A. Papadopoulos (Department of Mechanical Engineering & Aeronautics, University of Patras, Patras, Greece.)

International Journal of Structural Integrity

ISSN: 1757-9864

Article publication date: 5 October 2015

189

Abstract

Purpose

Wear in journal bearings occurs when the operating conditions (high load, high temperature, low angular velocity or low viscosity), downgrade the ability of the bearing to carry load. The wear depth increases because the rotor comes in contact with the bearing surface. Wear in journal bearings affects their characteristics because of its influence on the thickness of the fluid film. This influence can be detected in the dynamic behavior of the rotor and especially in the dynamic stiffness and damping coefficients. The paper aims to discuss these issues.

Design/methodology/approach

In this paper, the effect of wear on the rotor dynamic stiffness and damping coefficients (K and C) of a short journal bearing is investigated. K and C in this work are estimated by using two methods a semi-analytical method and finite element (FE) analysis implemented in the ANSYS software.

Findings

The main goal of this research is to make the identification of wear in journal bearings feasible by observing the alternation of their dynamic coefficients. Both of the methods implemented are proven to be useful, while FE analysis can provide more accurate results.

Originality/value

This paper is original and has not been published elsewhere.

Keywords

Citation

Papanikolaou, M.G., Farmakopoulos, M.G. and Papadopoulos, C.A. (2015), "Alternation of the dynamic coefficients of short journal bearings due to wear", International Journal of Structural Integrity, Vol. 6 No. 5, pp. 649-664. https://doi.org/10.1108/IJSI-05-2014-0025

Publisher

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Emerald Group Publishing Limited

Copyright © 2015, Emerald Group Publishing Limited

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