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Showing result 6 - 10 of 4022 swedish dissertations matching the above criteria.

2. 6. Global stability and feedback control of boundary layer flows

   Author : Espen Åkervik; Dan S. Henningson; Luca Brandt; Dwight Barkley; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Stability; Global Stability; Feedback Control; Control; Estimation; Absolute Convective Instabilities; Model Reduction; Fluid mechanics; Strömningsmekanik;

   Abstract : In this thesis the stability of generic boundary layer flows is studied from a global viewpoint using optimization methods. Global eigenmodes of the incompressible linearized Navier-Stokes equations are computed using the Krylov subspace Arnoldi method. READ MORE

4. 7. Transforming the City of Kiruna : Stabilizing Change and Changing Stability

   Author : Chelsey Jo Huisman; Anna Bengtson; Susanne Åberg; Wendy Smith; Uppsala universitet; []
   Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Change; Changing; Dialectical Process; Duality; Interaction; Interdependent Contradiction; Interorganizational Projects; Interorganizational Relationships; Process Perspective; Stability; Stabilizing; Transformation; Business Studies; Företagsekonomi;

   Abstract : With so much focus on change and transformation in the organizing of projects, stability is commonly separated from change and relegated to be a static characteristic. This gives the impression that stability is not even a part of the process of organizing a project. READ MORE

5. 8. Analysis and Design of Hybrid Systems

   Author : Stefan Pettersson; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; asymptotic stability; Lyapunov theory; exponential stability; piecewise quadratic Lyapunov functions; hybrid systems; stability; linear matrix inequalities; nonlinear systems; LMIs; control theory; fuzzy systems;

   Abstract : Many physical systems today are modeled by interacting continuous and discrete event systems. Such hybrid systems contain both continuous and discrete states that influence the dynamic behavior. READ MORE

6. 9. Wind Turbine Models for Power System Stability Studies

   Author : Abram Perdana; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; fixed-speed; variable-speed; validation; modelling; power system stability; frequency stability; aggregated model; wind turbine; voltage stability;

   Abstract : The purpose of this thesis is to develop dynamic models of wind turbines for power system stability studies. More specifically, the wind turbine models are mainly intended for voltage and frequency stability studies. READ MORE

7. 10. Stability and Receptivity of Three-Dimensional Boundary Layers

   Author : David Tempelmann; Dan Henningson; Stefan Hein; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Receptivity; stability; optimal growth; three-dimensional boundary layers; parabolised stability equations; adjoint PSE; crossflow instability; Fluid mechanics; Strömningsmekanik;

   Abstract : The stability and the receptivity of three-dimensional flat plate boundary layers is studied employing parabolised stability equations. These allow for computationally efficient parametric studies. Two different sets of equations are used. READ MORE