Editorial Board

Instructions for Authors

Review Process





Maria Brandusa ILIE







"Politehnica" University of Bucharest, ROMANIA


Abstract. Journal bearings operating over a great number of years and submitted to frequent starts and stops can be affected by the cumulative effect of wear. In some previous studies it was shown that, in some cases, wear has no significant negative effects or, apparently surprisingly, can be quite beneficial. This was shown based on complex TEHD models with numerical solutions. However, using such complex models that require high computational resources and long CPU time it is very difficult to perform parametric analyses. The purpose of the present work is to develop a simplified solution for Reynolds equation for full film journal bearings affected by wear. The model is applied to isothermal, steady-state, 360° journal, but it can be easily adapted to partial journal bearings. The model allows for quick results with acceptable accuracy. The results are obtained numerically, based on simple integration of a second order differential equation. Comparisons with similar results obtained by Fillon and co-workers [1] are very encouraging, showing very small differences with an important gain in CPU time.


Keywords: journal bearing, wear, Reynolds equation, hydrodynamic lubrication, simplified model




  1. Fillon, M., Bouyer, J., 2004, “Thermo- hydrodynamic Analysis of a Worn Plain Journal Bearing,” Tribology International, 37, 2, pp. 129-136.

  2. Shelly, P., Ettles, C., 1970, “A Tractable Solution for Medium-Length Journal Bearings,” Wear, 16, pp. 221-228.

  3. Duckworth, W.E., Forrester, P.B., 1957, “Wear of Lubricated Journal Bearings,” Proc. Instn. Mech. Engrs. Conference on Lubrication and Wear, London, pp. 714-719.

  4. Dufrane, K.F., Kannel, J.W., McCloskey, T.H., 1983, “Wear of Steam Turbine Journal Bearings at Low Operating Speeds,” Trans. ASME – J. of Lubrication Technology, 105, pp. 313-317.

  5. Hashimoto, H., Wada, S., Nojima, K., 1986, “Performances Characteristics of Worn Journal Bearings in both Laminar and Turbulent Regime, Part 1: Steady-state Characteristics,” ASLE Transactions, 29, pp. 565-571.

  6. Kumar, A., Mishra, S.S., 1996, “Steady-state Analysis of Non-circular Worn Journal Bearings in Non-laminar Lubrication Regimes,” Tribology International, 29, pp. 493-498.

  7. Nikolakopoulos, P.G., Papadopoulos, C. A., 2008, “A Study of Friction in Worn Misaligned Journal Bearings under Sever Hydrodynamic Lubrication,” Tribology International, 41, 6 , pp. 461-472.

  8. Archibald, F.R., 1950, “A Simple Hydrodynamic Thrust Bearing,” Trans. ASME - J. of Basic Engineering, 393-400.

  9. Hersey, M.D., 1966, Theory and Research of Lubrication, John Willey & Sons , New York.

  10. Ilie, M.B., 2008, The Influence of Wear on the Performance Characteristics of Fluid Film Journal Bearings in Steady-State Regime, Diploma Thesis, Politehnica University of Bucharest.