Performance of hydrodynamic journal bearing operating under transient wear

• Autorzy: Sharma S. , Kumar Awasthi R.
• Języki publikacji: EN

Abstrakty

EN

The paper deals with a theoretical study concerning the effect of transient wear on the performance of hydrodynamic journal bearing . The eccentricity ratios are considered 0.3, 0.6 and for varying wear depth from 0.1 to 0.5 for the analysis of purpose. The Reynolds equations governing the flow of lubricant in the clearance space of a hydrodynamic journal bearing system with varying wear depth has been numerically solved using Galerkin’s FEM. The regime is assumed to be isothermal. The positive pressure zone is established using Reynolds boundary condition through iteratively. The various performance parameters which include static, dynamic and stability terms of worn journal bearing are presented with respect to relative wear depth. The journal centre motion trajectories are also obtained by numerically integrated linear and non-linear equation of motion using fourth order Runga-Kutta method. For this a computer program in Matlab was developed based on analysis to draw the linear and non linear motion trajectories and in order to validate the developed program, the numerically simulated results computed from the present study are compared with the already published results in literature. For analysis purpose the initial values of velocities and displacement are taken as ¯˙X = ¯˙Z = 0:0 and ¯x and ¯z = 0:005. The results help in predicting bearing life for smooth operation.

Słowa kluczowe

EN

Finite Element Method; FEM; aspect ratio; worn journal bearing

PL

metoda elementów skończonych; MES; współczynnik kształtu; łożysko poprzeczne

• Wydawca: Wydawnictwo Politechniki Łódzkiej
• Czasopismo: Mechanics and Mechanical Engineering
• Rocznik: 2018
• Tom: Vol. 22, nr 1
• Strony: 153--170
• Opis fizyczny: Bibliogr. 18 poz., 1 rys., wykr.

Twórcy

autor

Sharma S.

• Research Scholar, I.K.Gujral Punjab Technical University, Kapurthala, Punjab-144603, India
• Department of Mechanical Engineering, Shri Mata Vaishno Devi University Katra-182320, India

autor

Kumar Awasthi R.

• Department of Mechanical Engineering, Beant College of Engineering and Technology, Gurdaspur, Punjab-143521, India

Bibliografia

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• [2] Forrestor, P, B.,: Bearing and journal wear, Symposium on wear in the gasoline Engine, Thomson Research Centre, 75–91, 1969.
• [3] Katzenmeier, G.: The influence of materials and surface quality on wear behavior and load capacity of journal bearings, proc. Inst. Mech. Eng., Tribology Convention, Paper C/100/72, 80–84, 1972.
• [4] Mokhtar, M. O., Howarth, R. B., Davies, P. B.: Wear characteristics of plain hydrodynamic journal bearings during repeated starting and stopping, ASLE Trans., 20, 3, 191–194, 1978
• [5] Dufrane, K. F., Kannel, J. W., McCloskey, T. H.: Wear of steam turbine journal bearings at low operating speeds, ASME Journal of Lubricant Technology, 105, 105, 313–17, 1983.
• [6] Kumar, A., Mishra, S. S.: Stability of rigid rotor in turbulent hydrodynamic worn journal bearings, Wear, 193, 25–30, 1996.
• [7] Kumar, A., Mishra, S. S.: Steady state analysis of non-circular worn journal bearings in non-laminar lubrication regimes, Tribology International, 29, 493–498, 1996.
• [8] Singh, D. V,, Sinhasan, R., Tayal, S. P.: Theoretical Prediction of Journal Center Motion Trajectories, Transaction, ASME, Journal of Lubrication Technology, 6, 620–628, 197.
• [9] Kirk, R. G., Gunter, E. J.: Stability and Transient Motion of a Plain Journal Mounted in Flexible Damped Supports, Transaction. ASME, Journal of Lubrication Technology, 316–329, 1976.
• [10] Chandrawat, H. N., Sinhasan, R.: A study of steady state and transient performance characteristics of a flexible journal bearing, Tribology International, 21, 3, 137–148, 1988.
• [11] Malik, M. Bhakgava, S. K., Sinhasan, K.: The Transient Response of a Journal in Plane Hydrodynamic Bearing During Acceleration and Deceleration Periods. Tribology transaction, 32, 1, 61–69, 1989.
• [12] Sinhasan, R., Goyal, K. C.: Transient response of a circular journal bearing lubricated with non newtonian lubricants, Wear, 156, 385–399, 1992.
• [13] Choy, F. K, Braun, M. J., Hu, Y.: Nonlinear Transient and Frequency Response Analysis of a Hydrodynamic Journal Bearing. Transaction, ASME, Journal Lubrication, Technology, 114, 448–454, 1992.
• [14] Vijayaraghavan, D., Brewe, D. E.: Frequency Effects on the Stability of a Journal Bearing for Periodic Loading. Transaction, ASME, Journal Lubrication, Technology, 114, 107–115, 1992.
• [15] Khonsari, M. M., Chang, Y. J.: Stability Boundary of Non-Linear Orbits Within Clearance Circle of Journal Bearings, Transaction, ASME, Journal of Vibration and Acoustics, 115, 303–307, 1993.
• [16] Raghunandana, K., Majumdar, B. C.: Stability of journal bearing systems using non-newtonian lubricants: a non-linear transient analysis, Tribology International, 32, 179–184, 1999.
• [17] Rao, T. V. V. L. N., Biswas, S.: An Analytical Approach to Evaluate Dynamic Coefficients and Nonlinear Transient Analysis of a Hydrodynamic Journal Bearing, Tribology Transcation, 43, 1, 109–115, 2000.
• [18] Sharma, S., Awasthi, R. K.: Effect of aspect ratio on the performance and stability of hydrodynamic Journal Bearings, International Journal of Advance Research and Innovation, 4, 1, 96–105, 2016.

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).