Fault Analysis of Journal Bearing Considering the Turbulent and Thermo-Hydrodynamic Effects

Abstract:

In order to investigate the cause of the typical bush rupture and wear damages in the journal bearing of the steam turbine generator set, the lubrication turbulence and thermo-hydrodynamic effects were studied. The generalized Reynolds equation, energy equation and heat conduction equations were solved with the finite difference method, and the pressure, temperature, thickness distribution of the oil film were obtained. Analysis results can be well explains the bearing bush burst in bearings maximum pressure place because of heavy load running. The bearing bush burst made friction intensified that caused oil temperature increasing and the viscosity reduce, which led to the rotor eccentricity increase, the minimum film thickness smaller and bearing static working point down, thus causing the wear damages until shutdown.

• Periodical: Applied Mechanics and Materials (Volumes 670-671)
• Pages: 638-645
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.670-671.638
• Online since: October 2014
• Authors: Guo Hui Xu*, Jian Zhou, Hai Peng Geng, Ming Jian Lu
• Keywords: Journal Bearing, Thermo-Hydrodynamic Effect, Turbulence, Wear

References

[1] Bearing Damage Mamual. Miba Bearing Group, htt: /www. miba. com.

[2] BHUSHAN B. Modern Tribology Handbook[M]. CRC Press : Vol. 1. (2001).

[3] IWASAWA K，MATSUDA S，MIZUNO Y，MOCHIZUKI M，evaluation of wear between crank shaft and bearing materials in diesel engines, CIMAC Congress, IIMTERLAKEM. (1995).

[4] USHIJIMA, K., AOYAMA, S., KITAHARA, K., OKAMOTO, Y., JONES, G., Xu, H., A study on engine bearing wear and fatigue using EHL analysis and experimental Analysis, SAE paper 1999-01-1514.

DOI: 10.4271/1999-01-1514

[5] OKAMOTO, Y., KITAHARA, K., USHIJIMA, K., AOYAMA, S., XU, H., JONES, G.J., A study for wear and fatigue of engine bearings on rig test by using elastohydrodynamic lubrication analysis, SAE paper 1999-01-0287.

DOI: 10.4271/1999-01-0287

[6] OKAMOTO, Y., KITAHARA, K., USHIJIMA, K., AOYAMA, S., XU H., JONES, G.J., A study for wear and fatigue on engine bearings by using EHL analysis, JSAE Review 21, pp.189-196. (2000).

DOI: 10.1016/s0389-4304(99)00092-2

[7] ARCHARD, J. F, Contact and Rubbing of Flat Surfaces, J. App. Phys., Vol. 34, p.981. (1953).

[8] WANG, W., WONG, P.L., Wear volume determination during running-in for PEHL contacts, Tribology International 33, 2000, p.501–506.

DOI: 10.1016/s0301-679x(00)00091-8

[9] Wang, X. L., 1999, Thermohydrodynamic Lubrication Analysis of Main Bearing for Internal Combustion Engine Considering Surface Roughness, Ph.D. thesis, Tsinghua University, Beijing, China. (In Chinese).

[10] Wang X，Zhang Z，Sun M. A comparison of flow fields predicted by various turbulent lubrication models with existing measurement [J]. Trans. ASME，Journal of Trbology, 2000, 122(2): 475-477.

DOI: 10.1115/1.555390

[11] LIU Daquan, The nonlinear oil-film forces model analysis and application of journal bearings considering thermo-hydrnamic effects, PhD thesis, Fu dan University. (2005).

[12] D. DOWSON, J.D. HUDSON, B. HUNTER,C.N. MARCH. An experimental investigation of the thermal equilibrium of steadily loaded journal bearings [J]. ALSE Trans, 1966, 181(3B): 70-80.

DOI: 10.1243/pime_conf_1966_181_034_02

[13] KHONSARI, M. M., and Beaman, J. J., 1986, Thermohydrodynamic Analysis of Laminar Incompressible Journal Bearings, ASLE Trans., 29, p.141–150.

DOI: 10.1080/05698198608981671

[14] ZHANG Zhiming, ZHANG Yanyang, XIE Youbo. Hydrodynamic lubrication theory of sliding bearings [M]. Bei Jing: Higher Education Press. (In Chinese).