Search for dissertations about: "Flyg- och rymdteknik"

Showing result 6 - 10 of 25 swedish dissertations containing the words Flyg- och rymdteknik.

  2. 6. Stability and transition in pitching wings

    Author : Prabal Negi; Dan Henningson; Ardeshir Hanifi; Philipp Schlatter; Olivier Marquet; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Flyg- och rymdteknik; Aerospace Engineering; Vehicle and Maritime Engineering; Farkostteknik;

    Abstract : The aeroelastic stability of airplanes is one of the most important aspects of airplane design. Flutter or divergence instabilities arising out of the interaction of fluid forces and structural elasticity must be avoided by design or through the limitation of the flight envelope. READ MORE

  4. 7. Aerodynamic Investigation of Leading Edge Contouring and External Cooling on a Transonic Turbine Vane

    Author : Ranjan Saha; Torsten Fransson; Jens Fridh; Tony Arts; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; gas turbine; aerodynamics; secondary flow; external cooling; trailing edge cooling; film cooling; aerodynamic loss; high pressure turbine; nozzle guide vane; Aerospace Engineering; Flyg- och rymdteknik; Energiteknik; Energy Technology;

    Abstract : Efficiency improvement in turbomachines is an important aspect in reducing the use of fossil-based fuel and thereby reducing carbon dioxide emissions in order to achieve a sustainable future. Gas turbines are mainly fossil-based turbomachines powering aviation and land-based power plants. READ MORE

  5. 8. Tooling and processing for efficient and high tolerance prepreg composite manufacturing

    Author : Tommy Grankäll; Malin Åkermo; Per Hallander; Simon Bickerton; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Tooling; Composite Manufacturing; Mould; Cure tool; Hot-forming; Compensation; Moisture; Shape distortion; Flyg- och rymdteknik; Aerospace Engineering;

    Abstract : Composite use is normally motivated in aircraft design by improved weight-specific mechanical properties as compared to metals. However, fatigue and dielectric properties may also be critical for material selection. READ MORE

  6. 9. Experimental Investigation of the Influence of Local Flow Features on the Aerodynamic Damping of an Oscillating Blade Row

    Author : Antonio Sanz Luengo; Torsten Fransson; Damian Vogt; Guillermo Paniagua; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Turbomachinery; Aeroelasticity; Flutter; Experimental Aerodynamics; CFD; Local Flow Features; Influence Coefficient; Linearity Assumption; Aerospace Engineering; Flyg- och rymdteknik;

    Abstract : The general trend of efficiency increase, weight and noise reduction has derived in the design of more slender, loaded, and 3D shaped blades. This has a significant impact on the stability of fan, and low pressure turbine blades, which are more prone to aeroelastic phenomena such as flutter. READ MORE

  7. 10. Attitude and Trajectory Estimation for Small Suborbital Payloads

    Author : Yunxia Yuan; Nickolay Ivchenko; Gunnar Tibert; Rafael Wisnewski; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; free falling; least squares optimization; unscented Kalman filter; Flyg- och rymdteknik; Aerospace Engineering;

    Abstract : Sounding rockets and small suborbital payloads provide a means for research in situ of the atmosphere and ionosphere. The trajectory and the attitude of the payload are critical for the evaluation of the scientific measurements and experiments. READ MORE