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 25 for “"cylinder liner"”.
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The effects of operating conditions on the hydrodynamic lubricant film thickness at the piston-ring / cylinder liner interface of a firing diesel engine
… the interfaces between the piston-ring and liner. During this project two capacitance methods were employed in a fired compression ignition engine, an amplitude modulated (AM) system originally developed by Grice and a new "high speed" capacitance technique based on a frequency modulated …
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Modeling of two-body fatigue wear of cylinder liner in internal combustion engines during the break-in period and its impact on engine lubrication
… which 20% is caused by the contact between the cylinder liner and the piston rings. The wear of cylinder liner not only leads to surface damage, but also results in the change of liner lubrication conditions. Therefore, a large number of tests are performed by researchers to investigate the …
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Development and application of a lubricant composition model to study effects of oil transport, vaporization, fuel dilution, and soot contamination on lubricant rheology and engine friction
… lubricant optimization at the piston ring-cylinder liner interface. Lubricating oil composition varies along the liner and throughout the engine. Composition changes occur due to degradation, vaporization, mixing during ring passage, fuel dilution, particulate matter contamination, and …
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In situ control of lubricant properties for reduction of power cylinder friction through thermal barrier coating
… example near top ring reversal along the engine cylinder liner. A strategy to reduce viscosity without increased metal-metal contact involves controlling the local viscosity away from top-ring-reversal locations. This paper discusses the implementation of insulation or thermal barrier coating …
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The effect of surface finish on piston ring-pack performance in advanced reciprocating engine systems
… also considered. Although many non-conventional cylinder liner finishes are now being developed to reduce friction and oil consumption, the effects of surface finish on ring-pack performance is not well understood. To enable the study of cylinder liner surface texture on predicted piston …
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Characterization of oil transport in the power cylinder of internal combustion engines during steady state and transient operation
… involving oil transport inside the power cylinder. Therefore, improving one area of engine performance, such as friction, may lead to decreased performance in another area, such as oil consumption. This work seeks to address some fundamental aspects of oil transport in the power cylinder …
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Modeling of contact between liner finish and piston ring in internal combustion engines based on 3D measured surface
… Interaction between piston ring pack and cylinder liner finish accounts for nearly 20 percent of the mechanical losses within an internal combustion engine, and is an important factor that affects the lubricant oil consumption. Among the total friction between piston ring pack and cylinder …
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Modeling of liner finish effects on oil control ring lubrication in internal combustion engines based on deterministic method
… of gasoline engines. Its interaction with the cylinder liner surface accounts for around 10% of the total frictional losses within an internal combustion engine, and is the most important factor that affects the lubricant oil consumption. A twin-land oil control ring model is developed based on …
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Oil Transport in Piston Ring Assemblies
… between the piston, piston-rings and the cylinder liner represents one of the most hostile environments the crankcase lubricant experiences in reciprocating engines. The role of piston rings is also becoming more complex in line with the increasing requirements for lower oil consumption …
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A study of the influence of ring gap size on the lubrication of piston rings in an internal combustion engine
… films developed between the piston ring and the cylinder wall of an internal combustion engine. It begins with a review on oil film thickness (OFT) measurement methods describing how techniques have developed since the last decade and continues by describing how a well established OFT measurement …
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Analysis of parasitic losses in heavy duty diesel engines
… as a novel approach to strategically increase cylinder liner temperatures in order to reduce power cylinder friction. By coating selected parts of the liner where piston speeds are high, local liner temperature is raised and local lubricant viscosity decreased in that region. In the mid-stroke, …
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Modeling piston skirt lubrication in internal combustion engines
… structural deformation of the piston skirt and cylinder liner. Major contributions of this work are analysis of and development of a model for the oil transport and exchange of the piston skirt region and its surroundings. The new oil transport model is composed with two elements. First, the oil …
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A multi-scale model for piston ring dynamics, lubrication and oil transport in internal combustion engines
… sealing between the piston ring and the cylinder liner. However tension reduction can result in additional lubricant consumption. The objective of this thesis is to understand and model the physical mechanisms resulting in flow of oil to the combustion chamber in order to achieve optimal …
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A Conditional approach to the tribology of RNLI marine systems.
… wear of main engine components, such as cylinder liners. The lifeboat application is distinct from the other marine applications from an engine lubrication perspective, since it involves infrequent engine running conditions and is often subjected to either under or over engine maintenance …
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Modeling the evolution of composition of the fuel and lubricant mixture on the cylinder wall in internal combustion engines
… of fuel spray can eventually end up on the cylinder liner. This fuel spray mixes with the oil (lubricant) present on the liner. Now the liquid layer on the liner consists of fuel and oil (fuel-oil film is formed) which interacts with the piston rings and the up-scraping of the fuel-oil film …
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Effects of lubricant viscosity and surface texturing on ring-pack performance in internal combustion engines
… are predicted to cause a reduction in ring/liner friction individually, a combined approach may cause an even greater friction reduction while mitigating unwanted side-effects such as oil consumption and wear. Existing MIT models, with some modifications and supplementary programs to allow …
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Measurement of piston / piston-ring friction and oil film thickness in an internal combustion engine
… of the lubrication of the piston/piston-ring and cylinder liner interface in internal combustion engines. It begins by identifying the relevance of such experimental work and reviews studies carried out by other investigators from the early 1900's to the present day. Following this, the …
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Estimation of oil consumption due to in-cylinder vaproization in internal combustion engines
… due to the vaporization of oil from (1) the cylinder liner and from (2) the piston ringpack in an internal combustion engine. The purpose of the models is to gauge the importance of oil vaporization as a contributor to overall engine oil consumption. Another purpose of the models is to study …
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A deterministic model for wear of piston ring and liner and a machine learning-based model for engine oil emissions
… long term wear of the piston, piston ring, and cylinder liner. Costly engine tests are required to develop the new system to meet emission and durability requirements. More advanced data analytics and models connecting critical design and operating parameters to performance will help shorten the …
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Design of Surface Texture for the Enhancement of Tribological Performance
… to improve the lubrication at the piston ring/cylinder liner interface. Its friction reduction effect is evaluated with both bench tests of piston ring prototypes and motorized engine tests of production piston rings.
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