A NUMERICAL INVESTIGATION STUDY OF MIXED LUBRICATION REGIME IN ROUGH JOURNAL BEARINGS

Bibliographic Details
Main Author:	Alshehery, Sultan Dahman
Language:	English
Published:	University of Akron / OhioLINK 2018
Subjects:	Mechanical Engineering
Online Access:	http://rave.ohiolink.edu/etdc/view?acc_num=akron1543426538350934

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spelling	ndltd-OhioLink-oai-etd.ohiolink.edu-akron15434265383509342021-08-03T07:09:05Z A NUMERICAL INVESTIGATION STUDY OF MIXED LUBRICATION REGIME IN ROUGH JOURNAL BEARINGS Alshehery, Sultan Dahman Mechanical Engineering ABSTRACT Under severe operating conditions, journal bearings operate under mixed lubrication regime where the severe metal to metal contacts occur and the surface roughness cannot be ignored. So, this research present a numerical study to investigate the mixed lubrication regime in rough journal bearings. The mixed lubrication model employs both the Greenwood and Williamson asperity contact model and the Patir and Cheng average flow model. This model is limited to the assumptions of an isothermal bearing, a laminar flow and an isotropic roughness orientation of the surface. The effects of different rough bearing surfaces, different eccentricity ratios and different journal speeds on the lubricant pressure distributions, the asperity pressure distributions, the coefficient of friction, and the lubricant viscosity are discussed. Also, the pressure flow factors, the shear flow factor, and the shear stress factors are compared at these rough bearing surfaces. The bearing rough surfaces are numerically generated using the Gaussian random roughness distribution function. The Barus viscosity equation was used to show the change in the lubricant viscosity with the hydrodynamic pressure at different journal bearing clearances. The Stribeck curve was reconstructed based on the simulation results to provide a solid base of proof to the numerical simulations of this mixed lubrication approach. The contributions of both the hydrodynamic friction and the solid friction towards the overall friction coefficient of the mixed lubrication and the hydrodynamic lubrication regimes were studied at different rough bearing surfaces as well as at different journal bearing clearances and compared to the smooth bearing surface. 2018 English text University of Akron / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=akron1543426538350934 http://rave.ohiolink.edu/etdc/view?acc_num=akron1543426538350934 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection	NDLTD
language	English
sources	NDLTD
topic	Mechanical Engineering
spellingShingle	Mechanical Engineering Alshehery, Sultan Dahman A NUMERICAL INVESTIGATION STUDY OF MIXED LUBRICATION REGIME IN ROUGH JOURNAL BEARINGS
author	Alshehery, Sultan Dahman
author_facet	Alshehery, Sultan Dahman
author_sort	Alshehery, Sultan Dahman
title	A NUMERICAL INVESTIGATION STUDY OF MIXED LUBRICATION REGIME IN ROUGH JOURNAL BEARINGS
title_short	A NUMERICAL INVESTIGATION STUDY OF MIXED LUBRICATION REGIME IN ROUGH JOURNAL BEARINGS
title_full	A NUMERICAL INVESTIGATION STUDY OF MIXED LUBRICATION REGIME IN ROUGH JOURNAL BEARINGS
title_fullStr	A NUMERICAL INVESTIGATION STUDY OF MIXED LUBRICATION REGIME IN ROUGH JOURNAL BEARINGS
title_full_unstemmed	A NUMERICAL INVESTIGATION STUDY OF MIXED LUBRICATION REGIME IN ROUGH JOURNAL BEARINGS
title_sort	numerical investigation study of mixed lubrication regime in rough journal bearings
publisher	University of Akron / OhioLINK
publishDate	2018
url	http://rave.ohiolink.edu/etdc/view?acc_num=akron1543426538350934
work_keys_str_mv	AT alsheherysultandahman anumericalinvestigationstudyofmixedlubricationregimeinroughjournalbearings AT alsheherysultandahman numericalinvestigationstudyofmixedlubricationregimeinroughjournalbearings
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A NUMERICAL INVESTIGATION STUDY OF MIXED LUBRICATION REGIME IN ROUGH JOURNAL BEARINGS

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