Search for dissertations about: "Machine Elements"
Showing result 11 - 15 of 245 swedish dissertations containing the words Machine Elements.
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11. Transient elastohydrodynamic lubrication : Effects of geometry, surface roughness, temperature, and plastic deformation
Abstract : The urgent need to reduce greenhouse gas emissions in combination with an increased use of sustainable energy resources have led to immense efforts on improving energy efficiency of mechanical systems. Consequently, modern machine elements are typically lubricated with low viscosity oils and designed to endure an increasingly high power density. READ MORE
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12. Effect of water contamination on the diffused content of hydrogen under stress in AISI-52100 bearing steel
Abstract : Abstract Hydrogen embrittlement is a degradation process of mechanical/tribological properties (toughness, wear etc.) of mating steel surfaces. This is caused by the presence and interaction of hydrogen with applied stresses. Therefore, it is important to quantify the hydrogen content which could be dissolved under applied stresses in steel. READ MORE
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13. Elastohydrodynamically lubricated finite line contacts operating under transient conditions
Abstract : The effect of greenhouse gas emissions contributing to the global warming is today becoming an increasingly important problem worldwide and has led to increased efforts being made on improving tribological performance of interacting surfaces in mechanical systems. Due to increasingly stringent CO2regulations, a reduced fuel consumption has become a key area of interest for the automotive industry where low cost, low emission solutions are continuously developed and where low friction alternatives to machine elements currently in use are evaluated. READ MORE
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14. Monitoring of wear in elasto- hydrodynamic lubricated contacts : Running-in and failure propagation
Abstract : Elasto-hydrodynamic lubricated (EHL) contacts can be found in various machine elements or systems, like rolling element bearings, cam followers or gear transmissions. The service life of these elements and systems are depending to some extent on the performance of EHL contacts. READ MORE
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15. Journal bearing design, lubrication and operation for enhanced performance
Abstract : The increasing introduction of intermittent power sources combined with the de-regulation of electricity markets has led to increased instability in the electrical grid. This has led to increased start-up and shutdown of regulating power sources such as hydro-electric power plants and operation at non-ideal operating states both of which increase the wear and tear on machines. READ MORE