Effects of Shaft Axial Motion and Misalignment on the Lubrication Performance of Journal Bearings Via a Fast Mixed EHL Computing Technology

Han, Yanfeng; Chan, Chia-Wen; Wang, Zhanjiang; Shi, Fanghui; Wang, Jiaxu; Wang, Nenzi; Wang, Q. Jane

doi:10.1080/10402004.2014.962207

Cited by 34 publications

(14 citation statements)

References 20 publications

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“…Then, Sun et al [19] actually measured the trajectory of the journal center of crankshaft bearing on a specially test rig of a multi-cylinder engine, and pointed out that there is the axial velocity and displacement of crankshaft at the direction of bearing axial within a working cycle of engine and the axial displacement of crankshaft journal is far greater than the radial clearance of crankshaft main bearing. Han et al [20,21] proposed a virtual-mesh approach to solve the difference equation of lubrication model in which the movement of shaft along the axial direction of shaft is considered. However, the effect of the shaft axial motion on the oil film thickness at radial direction of bearing is not considered and there are some errors in the established lubrication model by using axial velocity of shaft along the journal axis.…”

Section: Introductionmentioning

confidence: 99%

Effect of the axial movement of misaligned journal on the performance of hydrodynamic lubrication journal bearing with rough surface

Sun

Zhu

et al. 2019

Mechanics & Industry

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Generally, the movement of journal along the direction of bearing axis under the combined action of various factors is neglected in the lubrication study of bearing, which is quite different from the actual working condition of bearing in the shaft-bearing system. In this paper, with a comprehensive consideration of the axial movement of journal, the surface topography of journal and bearing and the misalignment of journal, a new model about the hydrodynamic lubrication of misaligned journal bearing is established based on the average Reynolds equation. Considering the effect of the axial movement of misaligned journal, the lubrication characteristics parameters of rough journal bearing is presented and mainly discussed. The results show that the axial movement of misaligned journal has a distinct effect on the bearing lubrication characteristics. The influence of the axial movement of misaligned journal on the bearing lubrication characteristics is slightly reduced when considering the surface roughness.

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Section: Introductionmentioning

confidence: 99%

Effect of the axial movement of misaligned journal on the performance of hydrodynamic lubrication journal bearing with rough surface

Sun

Zhu

et al. 2019

Mechanics & Industry

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“…Wei et al (2014) discussed mixed EHL with 3D machined roughness in spiral bevel gears, comprehensively analyzing gearing geometry, kinematics, mixed lubrication performance, friction, flash temperature and subsurface stresses. A series of transient analyses was conducted by Han et al (2015) to solve the mixed EHL model for journal bearings with the parallel odd–even successive over relaxation method based on red–black successive over relaxation method to minimize the execution time prolonged by the complexity caused by the axial flow and misalignments. A complete review of the EHL theory was discussed by Lugt and Morales (2010).…”

Section: Introductionmentioning

confidence: 99%

Multigrid method for the solution of EHL point contact with bio-based oil as lubricants for smooth and rough asperity

Awati

Naik

Kumar

2018

ILT

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Purpose The purpose of this paper is to study the elastohydrodynamic lubrication point contact problem with bio-based oil as lubricants for an isothermal case. The simulation of the problem is analyzed on smooth and rough asperity. Design/methodology/approach The modified Reynolds equation is discretized using finite difference and multigrid method with full approximation scheme (FAS), applied for its solution with varying load and speed. Findings This paper traces out the comparison of minimum and central film thickness with the standard formulation of Hamrock and Dowson. The effect of longitudinal roughness on surfaces is investigated by means of numerical simulations. Originality/value The results obtained are comparable with the standard results, and are shown by graphs and tables. Bio-based products bring out an alternative source of lubricant to reduce energy crises.

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“…It was noted that the execution time could be further deceased using more processor cores. Several recent studies [10][11][12][13][14][15][16] also show a few bearing analyses and optimum designs using OpenMP in Fortran coding. It was found that the execution time of the numerical simulations can be significantly reduced with a small amount of time and effort spent in code revision for parallel computing.…”

Section: Introductionmentioning

confidence: 99%

Fluid-film lubrication computing with many-core processors and graphics processing units

Wang

Chen

2018

Advances in Mechanical Engineering

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The advancement of modern processors with many-core and large-cache may have little computational advantages if only serial computing is employed. In this study, several parallel computing approaches, using devices with multiple or many processor cores, and graphics processing units are applied and compared to illustrate the potential applications in fluid-film lubrication study. Two Reynolds equations and an air bearing optimum design are solved using three parallel computing paradigms, OpenMP, Compute Unified Device Architecture, and OpenACC, on standalone shared-memory computers. The newly developed processors with many-integrated-core are also using OpenMP to release the computing potential. The results show that the OpenACC computing can have a better performance than the OpenMP computing for the discretized Reynolds equation with a large gridwork. This is mainly due to larger sizes of available cache in the tested graphics processing units. The bearing design can benefit most when the system with many-integrated-core processor is being used. This is due to the many-integrated-core system can perform computation in the optimization-algorithm-level and using the many processor cores effectively. A proper combination of parallel computing devices and programming models can complement efficient numerical methods or optimization algorithms to accelerate many tribological simulations or engineering designs.

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Effects of Shaft Axial Motion and Misalignment on the Lubrication Performance of Journal Bearings Via a Fast Mixed EHL Computing Technology

Cited by 34 publications

References 20 publications

Effect of the axial movement of misaligned journal on the performance of hydrodynamic lubrication journal bearing with rough surface

Effect of the axial movement of misaligned journal on the performance of hydrodynamic lubrication journal bearing with rough surface

Multigrid method for the solution of EHL point contact with bio-based oil as lubricants for smooth and rough asperity

Fluid-film lubrication computing with many-core processors and graphics processing units

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