Abstract
The effects of journal misalignment on a journal bearing caused by an asymmetric rotor structure are presented in this study. A new model considering the asymmetric deflection is applied. Also, the thermo-hydrodynamic of the oil film in the journal bearing and straightforward elasticity theory are considered in the analysis. Based on the structure stiffness equivalent characteristic, a simple stepped shaft can reflect the entire complex structure model. The existing lubrication model, which does not consider this angle component, is not very precise for journal bearings. Film pressure, misalignment angle, velocity field, oil leakage, and temperature field were calculated and compared in the journal bearing analysis. The results indicate that bearing performances are greatly affected by misalignment caused by the asymmetric structure. A simple stepped shaft can effectively represent a misaligned journal bearing in a rotor-bearing system.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Banwait, S.S., Chandrawat, H.N., Adithan, M., 1998. Thermohydrodynamic Analysis of Misaligned Plain Journal Bearing. Proceeding of First Asia International Conference on Tribology, p.35–40.
Bouyer, J., Fillon, M., 2002. Improvement of the THD performance of a misaligned plain journal bearing. Journal of Tribology, 125(2):334–342. [doi:10.1115/1.1510883]
Buckholz, R.H., Lin, J.F., 1986. The effect of journal bearing misalignment on load and cavitation for non-Newtonian lubricants. Journal of Tribology, 108(4):645–654. [doi:10.1115/1.3261295]
Das, S., Guha, S.K., Chattopadhyay, A.K., 2002. On the steady-state performance of misaligned hydrodynamic journal bearings lubricated with micropolar fluids. Tribology International, 35(4):201–210. [doi:10.1016/S0301-679X(01)00065-2]
Deng, M., 2008. Thermoelastohydrodynamic Analysis of Misaligned Plain Journal Bearing with Rough Surface. MS Thesis, Hefei University of Technology, China (in Chinese).
Dubois, G.B., Ocvirk, F.W., Wehe, R.L., 1957. Properties of misaligned journal bearing. Transactions ASME, 79: 1205–1212.
El-Butch, A.M., Ashour, N.M., 2005. Transient analysis of misaligned elastic tilting-pad journal bearing. Tribology International, 38(1):41–48. [doi:10.1016/j.triboint.2004.05.008]
Guha, S.K., 2000. Analysis of steady-state characteristic of misaligned hydrodynamic journal bearing with isotropic roughness effect. Tribology International, 33(1):1–12. [doi:10.1016/S0301-679X(00)00005-0]
Gulwadi, S.D., Shrimpling, G., 2003. Journal Bearing Analysis in Engines Using Simulation Techniques. SAE Technical Paper, No. 2003-01-0245.
Jang, J.Y., Khonsari, M.M., 2010. On the behavior of misaligned journal bearings based on mass-conservative thermo-hydrodynamic analysis. Journal of Tribology, 132(1):011702. [doi:10.1115/1.4000280]
Li, Q., Liu, S.L., Pan, X.H., Zheng, S.Y., 2012. A new method for studying the 3D transient flow of misaligned journal bearings in flexible rotor-bearing system. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 13(4):293–310.
Liu, H.W., 1994. Mechanics of Materials. Higher Education Press, Beijing, China (in Chinese).
McKee, S.A., McKee, T.R., 1932. Pressure distribution in the oil film of journal bearings. Transactions ASME, 54:149–165.
Pierre, I., Bouyer, J., Fillon, M., 2002. Thermohydrodynamic Study of Misaligned Plain Journal Bearings—Comparison Between Experimental Data and Theoretical Results. Proceedings of the Second World Tribology Congress, p.1–4.
Pierre, I., Bouyer, J., Fillon, M., 2004. Thermohydrodynamic behavior of misaligned plain journal bearings: theoretical and experimental approaches. Tribology Transactions, 47(4):594–604. [doi:10.1080/05698190490513 974]
Pinkus, O., Bupara, S.S., 1979. Analysis of misaligned grooved journal bearings. ASME Journal of Lubrication Technology, 101(4):503–509.
Smalley, A.J., McCallion, H., 1966. The effect of journal misalignment on the performance of a journal bearing under steady running conditions. Journal of Mechanical Engineering Science, 181(2):45–54. [doi:10.1243/PIME_CONF_1966_181_031_02]
Sun, J., Gui, C.L., 2004. Hydrodynamic lubrication analysis of journal bearing considering misalignment caused by shaft deformation. Tribology International, 37(10): 841–848. [doi:10.1016/j.triboint.2004.05.007]
Sun, J., Gui, C.L., Li, Z.Y., 2005a. An experimental study of journal bearing lubrication effected by journal misalignment as a result of shaft deformation under load. Journal of Tribology, 127(4):813–819. [doi:10.1115/1. 2033007]
Sun, J., Gui, C.L., Li, Z.Y., 2005b. Influence of journal misalignment caused by shaft deformation under rotational load on performance of journal bearing. Journal of Engineering Tribology, 219(3):275–283. [doi:10.1243/135065005X33937]
Sun, J., Deng, M., Fu, Y.H., Gui, C.L., 2010. Thermohydrodynamic lubrication analysis of misaligned plain journal bearing with rough surface. Journal of Tribology, 132(1):011704. [doi:10.1115/1.4000515]
Timoshenko, S., Gere, J., 1972. Mechanics of Materials. Van Nostrand Reinhold, New York.
Vijayaraghavan, D., 1989. New Concept in Numerical Prediction of Cavitation in Bearing. PhD Thesis, The University of Toledo.
Wang, Y.S., Zhang, C., Wang, Q.J., Lin, C., 2002. A mixed-TEHD analysis and experiment of journal bearings under severe operating condition. Tribology International, 35(6):395–407. [doi:10.1016/S0301-679X (02)00021-X]
Wen, S.Z., Huang, P., 2002. Lubrication Theory. Tsinghua University Press, Beijing, China (in Chinese).
Xu, Y.X., Li, Z.K., 1982. The Torsional Vibration of Diesel Vessel. China Communications Press, Beijing, China (in Chinese).
Zhai, X., Chang, L., 2001. Some insights into asperity temperatures in mixed-film lubrication. Tribology International, 34(6):381–387. [doi:10.1016/S0301-679X(01)00027-5]
Author information
Authors and Affiliations
Corresponding author
Additional information
Project supported by the National Natural Science Foundation of China (No. 60879002), and the Tianjin Support Plan of China (No. 10ZCKFGX03800)
Rights and permissions
About this article
Cite this article
He, Zp., Zhang, Jh., Xie, Ws. et al. Misalignment analysis of journal bearing influenced by asymmetric deflection, based on a simple stepped shaft model. J. Zhejiang Univ. Sci. A 13, 647–664 (2012). https://doi.org/10.1631/jzus.A1200082
Received:
Revised:
Published:
Issue Date:
DOI: https://doi.org/10.1631/jzus.A1200082