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Showing result 1 - 5 of 10 swedish dissertations matching the above criteria.

2. 1. Multi-Disciplinary Conceptual Design of Future Jet Engine Systems

   Author : Konstantinos G. Kyprianidis; Stephen O. T. Ogaji; Riti Singh; Herbert Saravanmuttoo; UK Cranfield University; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Gas Turbine; Intercooled; Recuperated; Turbofan; Future; Simulation; Performance; Aircraft; Emissions; Multi-disciplinary; Jet Engine; Energy- and Environmental Engineering; energi- och miljöteknik;

   Abstract : This thesis describes various aspects of the development of a multi-disciplinary aero engine conceptual design tool, TERA2020 (Techno-economic, Environmental and Risk Assessment for 2020), based on an explicit algorithm that considers: engine performance, engine aerodynamic and mechanical design, aircraft design and performance, emissions prediction and environmental impact, engine and airframe noise, and production, maintenance and direct operating costs.As part of this research effort, a newly-derived semi-empirical NOx correlation for modern rich-burn single-annular combustors is proposed. READ MORE

4. 2. Analysis and Evaluation of Innovative Aero Engine Core Concepts

   Author : Lei Xu; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; intercooled recuperated cycle; intercooler; intercooled cycle; multidisciplinary optimization; turbofan; innovative core; variable core cycle; thermal efficiency; aero engine;

   Abstract : Turbofan engines, which power the majority of the modern aircraft today, have achieved such a high maturity that small improvements of the engine performance requires a large investment. More innovative technologies, including those related to the engine cores, become increasinglyattractive due to the high fuel price in recent years as well as the strict regulations on emissions. READ MORE

5. 3. Working conditions, compensatory strategies, and recovery

   Author : Klas Gustafsson; Gunnar Aronsson; Bo Melin; Terry Hartig; Stockholms universitet; []
   Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; recovery; compensatory strategies; working conditions; self-ratings; vacation; validation; sickness presenteeism; sickness absence; work organization; health; allostatic load; Psychology; Psykologi; psykologi; Psychology;

   Abstract : The general aim of this thesis was to study and identify working conditions related to different types of compensatory strategies and to examine the relations between such strategies and recovery. Compensatory strategies refer to how people act in order to handle a great amount of work. READ MORE

6. 4. The work ability continuum : epidemiological studies of factors promoting sustainable work ability

   Author : Per Lindberg; Karolinska Institutet; Karolinska Institutet; []
   Keywords : Work; work ability; sustainable; positive health; sick leave; sickness absence; self-rated health; SRH; health assessment; promotion; prevention; follow-up; epidemiology;

   Abstract : For the individual, the workplace and society, there would be considerable gains if the number of people suffering from physical and mental disorders could be reduced. The overall aim of this thesis was to identify determinants for future work ability among gainfully employed women and men, with special reference to promotive factors at work. READ MORE

7. 5. On Exergy and Aero Engine Applications

   Author : Oskar Thulin; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Installed propulsion unit performance; Turbofan; Aero engine; Performance modelling; Exergy analysis;

   Abstract : Aero engine performance analysis is highly multidimensional using various measures of component performance such as turbomachinery and mechanical efficiencies, and pressure loss coefficients. Using conventional performance analysis, relying on only the first law of thermodynamics, it is possible to understand how the performance parameters affect the component performance, but not how the component performance relates to the system performance. READ MORE