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Showing 1 to 16 of 16 for “"elastohydrodynamic lubrication"”.
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Adjoint Error Estimation for Elastohydrodynamic Lubrication
… estimation techniques are applied to complex elastohydrodynamic lubrication (EHL) problems. A functional is introduced, namely the friction, and justification is provided as to why this quantity, and hence its accuracy, is important. An iterative approach has been taken to develop …
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Adaptive Numerical Methods for Elastohydrodynamic Lubrication
Numerical solutions to elastohydrodynamic lubrication problems have been computed for the last half century. Over the past decade multilevel techniques have been successfully applied in several solvers and significant speed-ups achieved. The aim of numerical research in this field is to develop …
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Elastohydrodynamic lubrication of smooth and rough surfaces
Different aspects of Elastohydrodynamic Lubrication (EHL) are studied. For smooth surfaces, a novel approach which solves separately the inlet and outlet regions by using the fracture mechanics equations, is proposed to solve EHL line contacts for shape and pressure. For rough surfaces, the full …
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High Order Finite Element Solution of Elastohydrodynamic Lubrication Problems
… is introduced to solve one- and two-dimensional Elastohydrodynamic Lubrication (EHL) problems (line contact and point contact). This thesis provides an introduction to elastohydrodynamic lubrication, including some history, and a description of the underlying mathematical model which is based …
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Numerical Analysis of Transient, Line-Contact Problems in Elastohydrodynamic Lubrication
Elastohydrodynamic (EHD) lubrication is a lubrication process which usually occurs in concentrated load-supporting or load-transmitting contacts. Such contacts exist, for example, in rolling-element bearings, gears and cam-follower mechanisms. In EHD lubrication, the contact surfaces are not only …
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Development and Application of Elastohydrodynamic Lubrication Model for Piston Pin
… and is subjected to high stress and harsh lubrication conditions. Pin seizure is a severe problem in new engine development and coatings could be a solution to this problem. However, by advancing the knowledge about the lubrication effect and the contact patterns on the pin’s surface, it is …
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The Effect of Surface Irregularities on The Elastohydrodynamic Lubrication of Sliding Line Contacts
… the effects of surface irregularities on the elastohydrodynamic (EHD) lubrication of sliding line contacts is presented. A series of case studies illustrates the effect of furrow, asperity, and wavy surface irregularities on the pressure distribution, film thickness, and subsurface octahedral …
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Thermal non-Newtonian elastohydrodynamic lubrication of line contacts under sliding-rolling and simple sliding conditions
… Reynolds-Eyring equation is derived to study the elastohydrodynamic lubrication of line contacts. This lubrication condition is usually found in spur gears, roller bearings and cams. The inlet region with back-flow is treated with a control volume scheme to obtain the temperature solution. A …
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Numerical modeling of piston secondary motion and skirt lubrication in internal combustion engines
… develop a numerical model of piston dynamics and lubrication in internal combustion engines, enabling prediction of friction generation at the piston -cylinder bore interface, and oil transport in the power cylinder system. It is currently estimated that the piston - cylinder bore friction …
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The performance of high speed reciprocating polymer seals in water
The elastohydrodynamic lubrication of polymeric piston seals in a water powered rockdrill has been modelled in this thesis. Current seal designs, consist of an Ultra High Molecular Weight Polyethylene (UHMWPE) ring, energised to remain in contact with the reciprocating piston, using a nitrile …
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Drug eluting prosthetic joints through drug cluster morphology control
… which through a combination of weeping and elastohydrodynamic lubrication, reduced the overall wear rate of the UHMWPE. Treatment of Staphylococcus aureus infected lapine knee with the antibiotic eluting UHMWPE showed complete bacterial eradication without any detectable systemic side …
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Polymer Nanocomposites: Polymer And Particle Dynamics And Its Application As Lubricant
… into the wear track and extension of the elastohydrodynamic lubrication regime to Sommerfeld numbers more than an order of magnitude larger than for PAO. ii
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Transient Analysis of Isothermal Elastohydrodynamic Point Contacts
… is very important to understand the behaviour of elastohydrodynamic films, formed between contacting surfaces in order to improve working performance and to prevent surface failure by wear or fatigue. As applied load, speed and the conjunction geometry vary with time under realistic operating …
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An Experimental Evaluation of Micro-pitting Performance of Two Bearing Steels
… that is required for validation of point contact lubrication models with circumferentially oriented surface roughnesses.