Sökning: "Rob Dwyer-Joyce"
Hittade 3 avhandlingar innehållade orden Rob Dwyer-Joyce.
1. Combustion Valve Wear : A Tribological Study of Combustion Valve Sealing Interfaces
Sammanfattning : The exhaust valve system of combustion engines experiences a very complex contact situation of frequent impact involving micro sliding, high and varying temperatures, complex exhaust gas chemistry and possible particulates, etc. In addition, the tribological situation in the exhaust valve system is expected to become even worse due to strict future emission regulations, which will require enhanced combustion and cleaner fuels. LÄS MER
2. Ionic lubricants : Molecular features and surface protection mechanisms
Sammanfattning : In this thesis ionic liquids (ILs) are investigated as prospective candidates for lubrication. Three custom synthesized phosphonium orthoborate type ILs were extensively studied from the prospective of molecular structuring both in bulk and at the interface and from the prospective of their lubricating performance as neat lubricants and as additives in oils. LÄS MER
3. Journal bearing design, lubrication and operation for enhanced performance
Sammanfattning : 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. LÄS MER