Sökning: "self-excited"

Visar resultat 1 - 5 av 14 avhandlingar innehållade ordet self-excited.

1. 1. Internal Design of a Class of Self-Excited Synchronous Generators

   Författare :Mohamed Wadi; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Soft Magnetic Composites; Hydropower Plants; Brushless Excitation; Self-Excited Generators; Renewable Energy; Reluctance Generators; Synchronous Generators; Small Hydropower;

   Sammanfattning : INTERNAL DESIGN OF A CLASS OF SELF-EXCITEDABSTRACTWith the increasing trend of distributed generation and the need for alternative and renewable energy sources, self-excited induction and synchronous reluctance generators have attracted more attention for wind, tidal and hydropower applications. This thesis is concerned with the development of a class of self-excited synchronous reluctance generators (SRG). LÄS MER

3. 2. Nonlinear Dust Particle Dynamics and Collective Effects in Complex Plasmas

   Författare :Gianfranco Sorasio; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Complex Dusty Plasmas; Self excited; Nonlinear; Forced Oscillations; Electrostatic Instabilities in current-carrying magnetoplasmas; Cross-field instabilities in magnetized dusty plasmas; Dust Acoustic Waves; Electrostatic Dust Cyclotron Waves; Fysik; Physics; Fysik; fysik; Physics;

   Sammanfattning : Theoretical studies of dusty plasmas have been performed by focusing attention principally on collective phenomena and on grain motion. This thesis consists of a collection of seven published papers that explore both the collective behavior of a complex plasma system as well as the dynamics of grains in plasmas. LÄS MER

4. 3. Drum Brake Squeal

   Författare :Johan Hultén; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; friction induced; squeak; vibration; drum brake; squeal; instability; self-excited; noise;

   Sammanfattning : Drum brake squeal is a common discomfort. The main goal of this thesis is to investigate the mechanisms that generate drum brake squeal and to create a base for the search for solutions. A series of steps towards the understanding of these mechanisms are taken. Firstly, a simple model for friction-induced vibration is presented. LÄS MER

5. 4. Numerical investigation of self-excited vibrations of a compressor cascade

   Författare :Moosa Muhammad; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; flutter; turbomachinery; compressor blade; CFD; stability; aerodynamic damping; stability parameter; modeshape; Mechanical energy engineering; Mekanisk energiteknik;

   Sammanfattning : .... LÄS MER

7. 5. From Macroscopic to Microscopic Dynamics of Superconducting Cavities

   Författare :Anirban Bhattacharyya; Vitaliy Goryashko; Volker Ziemann; Roger Ruber; Jean Delayen; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; superconducting cavity; superconductivity; self-excited loop; Ginzburg-landau; vortex; optimization; quality factor; microwave; Fysik med inriktning mot elementarpartikelfysik; Physics with specialization in Elementary Particle Physics;

   Sammanfattning : Superconducting (SC) radio frequency (RF) cavities are at the heart of many large-scale particle accelerators such as the European Spallation Source (ESS), the X-ray Free Electron Laser (XFEL), the Linac Coherent Light Source (LCLS)-II and the proposed International Linear Collider (ILC). The SC cavities are essentially resonant structures with very high intrinsic quality factors (Q0) of the order of 1010. LÄS MER