Full Shafting-Based Elastohydrodynamic Lubrication Simulation for Main Bearings of Marine Diesel Engine

Abstract:

To predict and analyze accurately the lubrication characteristics and its influencing factors of main bearing for large low-speed two-stroke marine diesel engine, based on EHD lubrication model of dynamically loaded bearing, coupling simulation between EHD and MBD for main bearing of marine diesel engine was carried out. Systemic models were established separately considering the independent crankshaft of diesel engine and the full shafting of propulsion power plant. Main bearing load, peak oil film pressure, oil film pressure distribution, MOFT and orbital path in one working cycle under rated working conditions were investigated, and simulation results were compared based on both models. The results show that, if the impact of full shafting was considered, the lubrication characteristics of No.8 main bearing changed significantly, the lubrication characteristics of other main bearings were similar as the simulation results of the independent crankshaft model.

• Periodical: Advanced Materials Research (Volumes 479-481)
• Pages: 1119-1123
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.479-481.1119
• Online since: February 2012
• Authors: Hui Xing, Hui Zhang, Qili Wu, Shu Lin Duan
• Keywords: Elastohydrodynamic(EHD) Lubrication, Full Shafting, Main Bearing, Marine Diesel Engine, Minimum Oil Film Thickness(MOFT), Multibody Dynamics (MBD)

References

[1] He Zhixian, Gui Changlin. Review of Multidisciplinary Coupling Analysis for Crankshaft System[J]. Vehicle Engine，2008, 174(2):1-4. (In Chinese)

[2] Yu Gongzhi, Wu Qili, Duan Shulin, et al. Elastohydrodynamic Lubrication Simulation on Main Bearing of Two-stroke Marine Diesel Engine. Proceedings of the 2010 International Conference on Computer Application and System Modeling, 2010(15):179-183.

DOI: 10.1109/iccasm.2010.5622573

[3] Wu Qili, Duan Shulin, Huang Chaoming, et al. Bearing Lubrication Simulation of Two-stroke Marine Diesel Engine. Proceedings of the 3rd International Conference on Modeling and Simulation, 2010(2):330-334.

DOI: 10.1109/iccasm.2010.5622573

[4] Xing Hui, Duan Shulin, Wu Zhanhua. Coupling Simulation between Elastohydrodynamic and Multi-body Dynamics for Main Bearing of Diesel Engine [J]. Lubrication Engineering, 2010, 35(2):64-68. (In Chinese)

DOI: 10.1109/iccasm.2010.5622573

[5] Guy Bayada, Sébastien Martin, Carlos Vázquez. An Average Flow Model of the Reynolds Roughness Including a Mass-Flow Preserving Cavitation Model[J]. ASME Journal of Tribology, 2005, 127:793-802.

DOI: 10.1115/1.2005307

[6] M. Prat, F. Plouraboue, N. Letalleur. Averaged Reynolds Equation for Flows between Rough Surfaces in Sliding Motion [J]. Transport in Porous Media, 2002, 48(3): 291-313.

DOI: 10.1023/a:1015772525610

[7] J. A. Greenwood, J. H. Tripp. The Contact of Two Nominally Flat Rough Surfaces [J]. Proceedings of the Institution of Mechanical Engineers, 1970, 185:625–634.

DOI: 10.1243/pime_proc_1970_185_069_02