Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 374 for “"Lubrication"”.
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Engine lubrication oil aeration
The lubrication system of an internal combustion engine serves many purposes. It lubricates moving parts, cools the engine, removes impurities, supports loads, and minimizes friction. The entrapment of air in the lubricating oil is called oil aeration. Oil aeration can be detrimental to internal …
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Scuffing Under Starved Lubrication Conditions
… criterion for scuffing under starved lubrication conditions are proposed. According to this hypothesis, scuffing is caused by the formation of macroscopic adhesions leading to bulk material failure due to plastic shearing.
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Mechanisms of mesothelial tissue lubrication
… to determine their effects on mesothelial tissue lubrication. Both thickening and thinning of the fluid layer were observed during sliding. The fluid thickness was found to change with sliding velocity and direction, but invariant with location on tissue surface. In tribological experiments, shear …
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LUBRICATION STUDY OF AN OSCILLATING BEARING
This investigation covers the regimes of operation of an unidirectionally loaded sleeve bearing. The particular journal studied was a hardened steel member oscillating through 30 , at various loads and speeds in a hardened steel bushing. From the results it was concluded that there were possibly …
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Adjoint Error Estimation for Elastohydrodynamic Lubrication
… 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 understanding of the mechanisms …
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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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Friction and lubrication in metal rolling
… physical processes which determine friction and lubrication in metal rolling in the mixed lubrication regime, with particular attention paid to the conditions encountered when rolling aluminium foil. Two areas of relevance to the analysis of the rolling process are initially investigated. …
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Molecular dynamics simulation of boundary lubrication
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Mathematical theory of lubrication-type flow
Thesis (Ph.D.) Massachusetts Institute of Technology. Dept. of Mathematics, 1947.
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Compressible Lubrication Theory in Pressurized Gases
Lubrication theory plays a fundamental role in all mechanical design as well as applications to biomechanics. All machinery are composed of moving parts which must be protected against wear and damage. Without effective lubrication, maintenance cycles will be shortened to impractical levels …
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Lubrication Forces in Polydimethylsiloxane (PDMS) Melts
… room temperature were studied by measurement of lubrication forces using an Atomic Force Microscopy (AFM) colloidal force probe. A glass probe was driven toward a glass plate at piezo drive rates in the range of 12 – 120 μm/s, which produced shear rates up to ~10⁴ s⁻¹. The forces on the probe and …
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Mixed and boundary lubrication in synovial joints
… prevent damage to the articular cartilage. The lubrication mechanisms which continue to provide low friction and minimum wear in synovial joints are far from clearly understood and few adequate studies have been undertaken to address this important issue. The specific objective of this study was …
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Ocular biotribology and contact lens lubrication mechanisms
… is concerned with mechanisms of contact lens lubrication. There are three major driving forces in contact lens design and development; cost, convenience, and comfort. Lubrication, as reflected in the coefficient of friction, is becoming recognised as one of the major factors affecting the …
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Complex fluid lubrication mechanics of polyacrylamide surfaces
… to lubricating ability. While most hydrogel lubrication studies assume a steady state of sliding, a recent study discovered that under constant sliding, the friction of a hydrogel interface was influenced strongly by the history of sliding to that point. That transient lubrication led to …
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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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Molecular dynamics-based approaches for mesoscale lubrication
Classical lubrication theory is unable to describe nanoscale flows due to the failure of two of its constitutive components: a) the Newtonian stress-strain rate relationship and b) the no-slip boundary condition. In this thesis, we present a methodology for deriving a modified Reynolds equation …
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Investigation of surface waves on hydrodynamic lubrication
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.
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A new approach to ceramic lubrication: tribopolymerization
The lubrication of ceramic materials is a difficult problem; conventional lubrication techniques are limited or often ineffective. Therefore, the concept of tribopolymerization -- originally proposed by Furey and later modified by Furey and Kajdas -- is used as a new approach to boundary …
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Biotribology: articular cartilage friction, wear, and lubrication
This study developed, explored, and refined techniques for the in vitro study of cartilage-on-cartilage friction, deformation, and wear. Preliminary results of in vitro cartilage-on- cartilage experiments with emphasis on wear and biochemistry are presented. Cartilage-bone specimens were obtained …
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Reciprocating compressor lubrication – lubricant dilution with natural gas species and the impact on lubrication rates at various operating conditions
… much lubricant is required for proper compressor lubrication? To address the first question, an experiment was devised to measure the dilution of a lubricant while it mixed with natural gas. This "dilution rate" was measured for multiple lubricants subjected to a range of temperatures and …
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