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A Full Numerical Solution to the Mixed Lubrication in Point Contacts full numerical solution for the mixed elastohydrodynamic lubrication (EHL) in point
Yuan-Zhong Hu,Dong Zhu +1 more
TLDR
In this article, a new numerical approach that is simple and robust, capable of handling three-dimensional measured engineering rough surfaces moving at different rolling and sliding velocities is presented.Abstract:
contacts is presented in this paper, using a new numerical approach that is simple and robust, capable of handling three-dimensional measured engineering rough surfaces moving at different rolling and sliding velocities. The equation system and the numerical procedure are unified for a full coverage of all the lubrication regions including the full film, mixed and boundary lubrication. In the hydrodynamically lubricated areas the Reynolds equation is used. In the asperity contact areas, where the film thickness is zero, the Reynolds equation is reduced to an expression equivalent to the mathematical description of dry contact problem. In order to save computing time, a multi-level integration method is used to calculate surface deformation. Sample cases under severe condition show that this approach is capable of analyzing different cases in a full range of l ratio, from infinitely large down to nearly zero (less than 0.03).read more
Citations
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Hydrodynamic lubrication of textured surfaces: A review of modeling techniques and key findings
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.
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Lubrication and wear modelling of artificial hip joints: A review
TL;DR: In this paper, a review of the literature on wear and lubrication models of hip prostheses is presented, stressing simplifying hypotheses, input data, methods and results, and pointed out that actually lubrication and wear are described neglecting each other while new advanced models including both aspects could be helpful.
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A Computer Program Package for the Prediction of EHL and Mixed Lubrication Characteristics, Friction, Subsurface Stresses and Flash Temperatures Based on Measured 3-D Surface Roughness
Dong Zhu,Yuan-Zhong Hu +1 more
TL;DR: In this paper, a unified numerical approach for point contact problems is presented, which is capable of simulating the entire transition from the full film EHD, mixed, down to boundary lubrication, using measured 3-D roughness.
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Micro-Textures in Concentrated Conformal-Contact Lubrication: Effects of Texture Bottom Shape and Surface Relative Motion
TL;DR: In this article, the effects of texture bottom shape and surface relative motion on lubrication enhancement using numerically generated textures by means of model-based virtual texturing and numerical simulation were investigated.
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Effects of surface texture on journal-bearing characteristics under steady-state operating conditions:
TL;DR: In this article, a numerical approach is used in the analysis of texture effects on bearing characteristics and the results from investigating the performance of bearing surfaces with spherical dimple textures suggest that contact characteristics such as minimumfilm thickness, maximumpressure, axial oil film flow, and friction torque may be improved through an appropriate surface texture geometry and appropriate textures distribution on the contact surface.
References
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Journal ArticleDOI
Contact of Nominally Flat Surfaces
TL;DR: In this article, the authors proposed a new theory of elastic contact, which is more closely related to real surfaces than earlier theories, and showed how the contact deformation depends on the topography of the surface, and established the criterion for distinguishing surfaces which touch elastically from those which touch plastically.
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An Average Flow Model for Determining Effects of Three-Dimensional Roughness on Partial Hydrodynamic Lubrication
Nadir Patir,H. S. Cheng +1 more
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The Contact of Two Nominally Flat Rough Surfaces
J. A. Greenwood,J. H. Tripp +1 more
TL;DR: In this article, the authors give a general theory of contact between two rough plane surfaces and show that the important results of the previous models are unaffected: in particular, the load and the area of contact remain almost proportional, independently of the detailed mechanical and geometrical properties of the asperities.
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Stochastic Models for Hydrodynamic Lubrication of Rough Surfaces
TL;DR: In this article, two different forms of Reynolds-type equation corresponding to two different types of surface roughness are developed and the mathematical form of these equations is similar but not identical to the form of the Reynolds equation governing the behaviour of smooth, deterministic bearing surfaces.
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Ball bearing lubrication: The elastohydrodynamics of elliptical contacts
TL;DR: In this paper, the history of ball bearings is examined, taking into account rollers and the wheel in the early civilizations, the development of early forms of rolling-element bearings in the classical civilizations and the emergence of the precision ball bearing, scientific studies of contact mechanics and rolling friction.