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Author

Yansong Wang

Other affiliations: Northwestern University
Bio: Yansong Wang is an academic researcher from Baker Hughes. The author has contributed to research in topics: Lubrication & Bearing (mechanical). The author has an hindex of 7, co-authored 10 publications receiving 212 citations. Previous affiliations of Yansong Wang include Northwestern University.

Papers
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Journal ArticleDOI
TL;DR: In this paper, a steady-state mixed-TEHD (thermo-elasto-hydrodynamic) model for journal bearings is developed, which considers the fluid flow in the gap formed by rough surfaces, asperity contact, surface thermoelastic deformations, and a temperature-pressure-viscosity relationship for the lubricant, as well as an angular misalignment between the journal and the bearing.

74 citations

Journal ArticleDOI
TL;DR: The Stribeck curve is an overall view of friction variation in the entire range of lubrication, including the hydrodynamic, mixed, and boundary lubrication as mentioned in this paper, and is used to model the friction of a journal-bearing conformal contact system through numerical simulation.
Abstract: The Stribeck curve is an overall view of friction variation in the entire range of lubrication, including the hydrodynamic, mixed, and boundary lubrication This paper presents the results of research on the friction of a journal-bearing conformal contact system in the form of Stribeck curves through numerical simulation The surface roughness of the journal and the bearing and material elasticity and thermoelasticity are included in the modeling, and their influences on the results of Stribeck curves are discussed A three-dimensional Stribeck surface is constructed to illustrate the load effect on friction for the modeled journal-bearing structure Review led by Gary Barber

57 citations

Journal ArticleDOI
TL;DR: In this paper, a mixed lubrication model is developed to investigate the lubrication of coupled journal-thrust bearing systems and the governing equations are mapped into a computational domain with a conformal mapping technique.
Abstract: A mixed lubrication model is developed to investigate the lubrication of coupled journal-thrust-bearing systems The governing equations are mapped into a computational domain with a conformal mapping technique developed in a previous study by Wang et al (2002) In order to study the influence of the boundary conditions on the performance of the bearing system, either the Reynolds boundary conditions or the JFO's mass conserving conditions are applied to the governing Reynolds equations The performance of a typical coupled journal-thrust bearing system is numerically investigated and the effects of viscosity, misalignment angle and feeding scheme are discussed

34 citations

Journal ArticleDOI
TL;DR: In this article, a mixed-EHL analysis of effects of misalignments and elastic deformations on the performance of a coupled journal-thrust bearing system is presented, where two types of misalignment (axial and twisting) are considered.

29 citations

Journal ArticleDOI
TL;DR: In this paper, a finite element model is presented for mixed lubrication of journal-bearing systems operating in adverse conditions, and the asperity effects on contact and lubrication at large eccentricity ratios are modelled.
Abstract: A finite element model is presented for mixed lubrication of journal-bearing systems operating in adverse conditions. The asperity effects on contact and lubrication at large eccentricity ratios are modelled. The elastic deformation due to both hydrodynamic and contact pressure, and the cavitation of the lubricant film are considered in the model system. Two verification problems with both theoretical and experimental comparisons are given to show the effectiveness of this model. Finally, a new example is presented which discusses the influence of waviness depth, secondary roughness, external force and shaft speed on the mixed lubrication. Copyright © 2004 John Wiley & Sons, Ltd.

20 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the authors provide a comparative summary of different modeling techniques for fluid flow, cavitation and micro-hydrodynamic effects for surface texturing, and provide the key findings.

590 citations

Journal ArticleDOI
TL;DR: In this paper, the authors report the results of a series of experiments performed on a journal bearing together with a theoretical prediction of the Stribeck-type behavior for various loads and oil temperatures.
Abstract: The Stribeck curve plays an important role in identifying boundary, mixed, elastohydrodynamic, and hydrodynamic lubrication regimes. Recent advances in elastohydrodynamic lubrication together with rough surface interaction have made it possible to develop a methodology for predicting the trend of the Stribeck curve. In this paper; we report the results of a series of experiments performed on a journal bearing together with a theoretical prediction of the Stribeck-type behavior. Various loads and oil temperatures are considered. The comparison between the experimental results with a mixed elastohydrodynamic lubrication model for line contacts is indicative of good agreement.

212 citations

Journal ArticleDOI
TL;DR: Developing an in vitro cartilage on glass test system to measure friction coefficient, mu, and implementing and extending a framework for the determination of cartilage lubrication modes to determine the effects of synovial fluid on mu and lubrication mode transitions were successful.

168 citations

Journal ArticleDOI
TL;DR: In this paper, an overview of common failure modes of rotating machinery is provided along with the most relevant degradation mechanisms and their application for prognostics are discussed, while the majority of the research in health condition monitoring focuses on data-driven techniques, physicsbased techniques are particularly important if accuracy is a critical factor and testing is restricted.
Abstract: Health condition monitoring for rotating machinery has been developed for many years due to its potential to reduce the cost of the maintenance operations and increase availability. Covering aspects include sensors, signal processing, health assessment and decision-making. This article focuses on prognostics based on physics-based models. While the majority of the research in health condition monitoring focuses on data-driven techniques, physics-based techniques are particularly important if accuracy is a critical factor and testing is restricted. Moreover, the benefits of both approaches can be combined when data-driven and physics-based techniques are integrated. This article reviews the concept of physics-based models for prognostics. An overview of common failure modes of rotating machinery is provided along with the most relevant degradation mechanisms. The models available to represent these degradation mechanisms and their application for prognostics are discussed. Models that have not been applied...

166 citations

Journal ArticleDOI
TL;DR: In this article, the relationship between a dimpled texture design and the mixed lubrication characteristics for a typical counterformal contact was explored. And the authors demonstrated that virtual texturing is able to provide comparative information and directions for innovative surface design and optimization.
Abstract: Engineering practices and analyses have indicated that surface textures and topography may significantly affect the tribological performance of contact interfaces. Such an influence may be complicated and difficult to be captured with only a few statistic surface parameters. The need for further improvement of the performance and life of machine elements requires that surface topography and textures he optimized. The utilization of a numerical tool to determine the basic geometric aspects of surface textures may be named a virtual texturing technology, with which surface optimization may start from patterned surfaces where topography can be precisely quantified and the relationship between textures and lubrication performance can be numerically established. Presented in this paper are the concept of the virtual texturing technology, models involved, and a preliminary exploration of the relationship between a dimpled texture design and the mixed lubrication characteristics for a typical counterformal contact. The dimple influence area and the number of interruption are found to be two key factors for designing dimpled surfaces for counterformal contact lubrication. It is demonstrated that virtual texturing is able to provide comparative information and directions for innovative surface design and optimization.

137 citations