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Performance Analysis of Plain Journal Bearing Using CFD Model

M.M. Shahin, M.A. Chowdhury, M.H. Monir


Bearing stability depends on the slenderness ratio (L/D), lubricant film thickness, lubricant whirl frequency, lubricant oil temperature, lubricant pressure, attitude angle, stiffness coefficient, viscosity, lubricant density etc.Due to the friction force between shaft and bearing, bearing performance need to be determined according to different lubrication states and different geometry of the journal bearing, though it is difficult to find the performance using experiment. A new approach has been proposed in this study to determine the performance parameter using Ansys.The purpose of this study is to obtain an efficient slenderness ratio (L/D) by stiffness coefficient analysis on different coordinate of the journal bearing. It is a major concern to find out the viscosity and slenderness ratio (L/D) effects on bearing performance using CFD analysis. This is the first such type of study that the bearing performance has been conducted with0.25 to 1.00 range of slenderness ratioand change of viscosity of lubricants by FLUENT 14.5. A Computational Fluid Dynamic (CFD) approach was applied which focused an optimized slenderness ratio range of 0.25 to 0.5 results lower elastic strain, deformation, and stress formation on the journal comparison to 1.00L/D ratio. 

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Zhang, X., et al., Determination of stiffness coefficients of hydrodynamic water-lubricated plain journal bearings. Tribology International, 2015. 85: p. 37-47.

Hashimoto, H. and M. Ochiai, Experimental study on the stabilization of small-bore journal bearings by controlling starved lubrication and bearing orientation angle. Journal of Tribology, 2009. 131(1): p. 011705.

Litwin, W., Experimental research on water lubricated three layer sliding bearing with lubrication grooves in the upper part of the bush and its comparison with a rubber bearing. Tribology International, 2015. 82: p. 153-161.

Taylor, R.I., Tribology and energy efficiency: From molecules to lubricated contacts to complete machines. Faraday discussions, 2012. 156(1): p. 361-382.

Knauder, C., et al., Analysis of the journal bearing friction losses in a heavy-duty diesel engine. Lubricants, 2015. 3(2): p. 142-154.

Nikolakopoulos, P.G. and D.A. Bompos, Experimental Measurements of Journal Bearing Friction Using Mineral, Synthetic, and Bio-Based Lubricants. Lubricants, 2015. 3(2): p. 155-163.

Kasai, M., Friction Reduction and Reliability Improvement of Plain Bearing Lubrication with Lubricating Automotive Engine Oil. 2010, Université de Poitiers.

Jang, J.Y. and M.M. Khonsari, On the Characteristics of Misaligned Journal Bearings. Lubricants, 2015. 3(1): p. 27-53.

Spencer, N.D., Tribology. Faraday discussions, 2012. 156(1): p. 435-438.

Durak, E., H. Koruca, and C. Kurbanoğlu. Additional with additive decreases of friction at journal bearing. in Symposium of Mechanical Engineering. 1999.

Ahmad, M.A., S. Kasolang, and J.A. Ghani. Effects of oil groove location on viscosity profile in hydrodynamic lubrication journal bearing. in Proceedings of Malaysian International Tribology Conference 2015. 2015. Malaysian Tribology Society.

Kasai, M., et al., Influence of lubricants on plain bearing performance: Evaluation of bearing performance with polymer-containing oils. Tribology International, 2012. 46(1): p. 190-199.

Jang, J.Y. and M.M. Khonsari, On the Behavior of Misaligned Journal Bearings Based on Mass-Conservative Thermohydrodynamic Analysis. Journal of Tribology, 2009. 132(1): p. 011702-011702.

Zhang, H., C. Zhu, and Q. Yang, Characteristics of Micro Gas Journal Bearings Based on Effective Viscosity. Journal of Tribology, 2009. 131(4): p. 041707-041707.

Nikolajsen, J.L., The Effect of Variable Viscosity on the Stability of Plain Journal Bearings and Floating-Ring Journal Bearings. Journal of Lubrication Technology, 1973. 95(4): p. 447-456.

Neacşu, I.A., et al., Experimental Validation of the Simulated Steady-State Behavior of Porous Journal Bearings1. Journal of Tribology, 2016. 138(3): p. 031703-031703.

Offner, G., Friction power loss simulation of internal combustion engines considering mixed lubricated radial slider, axial slider and piston to liner contacts. Tribology Transactions, 2013. 56(3): p. 503-515.

Bompos, D. and P. Nikolakopoulos, Journal Bearing Stiffness and Damping Coefficients Using Nanomagnetorheological Fluids and Stability Analysis. Journal of Tribology, 2014. 136(4): p. 041704.

Hashimoto, H. and M. Ochiai, Stabilization Method for Small-Bore Journal Bearings Utilizing Starved Lubrication. Journal of Tribology, 2010. 132(1): p. 011703.

Matsumoto, K. and H. Hashimoto, Study on Improvement of Stability of Noncircular Journal Bearing (Analysis of Stability in Case of Bearing Orientation Angle Change). Trans. Jpn. Soc. Mech. Eng., Ser. C, 2004. 70(692): p. 1199-1206.

Gertzos, K., P. Nikolakopoulos, and C. Papadopoulos, CFD analysis of journal bearing hydrodynamic lubrication by Bingham lubricant. Tribology International, 2008. 41(12): p. 1190-1204.

Guo, Z., T. Hirano, and R.G. Kirk, Application of CFD analysis for rotating machinery—part I: hydrodynamic, hydrostatic bearings and squeeze film damper. Journal of Engineering for Gas Turbines and Power, 2005. 127(2): p. 445-451.

Deligant, M., P. Podevin, and G. Descombes, CFD model for turbocharger journal bearing performances. Applied Thermal Engineering, 2011. 31(5): p. 811-819.


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