Search for dissertations about: "stall"

Showing result 11 - 15 of 45 swedish dissertations containing the word stall.

  2. 11. Linear and non-linear dynamics of non-autonomous flows

    Author : J. Simon Kern; Dan S. Henningson; Ardeshir Hanifi; Peter J. Schmid; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Time-dependent flows; linear stability; non-linear dynamics; Floquet analysis; optimally time-dependent modes; Teknisk mekanik; Engineering Mechanics;

    Abstract : Fluid flows subject to time-dependent external forces or boundary conditions are ubiquitous in biology and technical applications. Whether one considers birds flying by flapping their wings or the gust response of wind turbines, the flow is non-autonomous. READ MORE

  4. 12. Rethinking Dynamic Instruction Scheduling and Retirement for Efficient Microarchitectures

    Author : Mehdi Alipour; David Black-Schaffer; Stefanos Kaxiras; Mikko H. Lipasti; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Out-of-Order Processors; Energy-Efficient; High-Performance; Instruction Scheduling; Computer Science; Datavetenskap;

    Abstract : Out-of-order execution is one of the main micro-architectural techniques used to improve the performance of both single- and multi-threaded processors. The application of such a processor varies from mobile devices to server computers. READ MORE

  5. 13. Static instruction scheduling for high performance on energy-efficient processors

    Author : Kim-Anh Tran; Alexandra Jimborean; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Computer Science; Datavetenskap;

    Abstract : New trends such as the internet-of-things and smart homes push the demands for energy-efficiency. Choosing energy-efficient hardware, however, often comes as a trade-off to high-performance. READ MORE

  6. 14. Rapid Aerodynamic Method for Interacting Sails

    Author : Karolina Malmek; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; lifting line method; wind-assisted propulsion; sail–sail interaction; wingsail; wind propulsion system;

    Abstract : Rapid performance prediction tools are required for the evaluation, optimization, and comparison of different wind propulsion systems (WPSs). These tools should capture viscous aerodynamic flow effects in 3D, especially the maximum propulsion force, stall angles and interaction effects between the lift-generating units. READ MORE

  7. 15. Analysis, Modeling and Control of Doubly-Fed Induction Generators for Wind Turbines

    Author : Andreas Petersson; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; current control; voltage sag; wind turbine; wind energy; doubly-fed induction generator; power quality;

    Abstract : This thesis deals with the analysis, modeling, and control of the doubly-fed induction generator (DFIG) for wind turbines. Different rotor current control methods are investigated with the objective of eliminating the influence of the back electromotive force (EMF), which is that of, in control terminology, a load disturbance, on the rotor current. READ MORE