Sökning: "Eigenmode"

Visar resultat 1 - 5 av 14 avhandlingar innehållade ordet Eigenmode.

  1. 1. Historiska träbärverk : Strukturmekaniska metoder och visualisering

    Författare :Carl Thelin; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; FEM; Roof truss; Structural mechanics; Historic structure; Visualisation; Static behaviour; Static eigenvalue; Eigenmode; Finite Element Method;

    Sammanfattning : In designing and erecting buildings in historical times, creating the loadcarrying structure was perhaps the greatest challenge with which the architect and the builder were faced. We encounter structures in which there was a strive to reach vertical heights in the pillars and walls and to extend the horizontal span of the beams and vaults that were built. LÄS MER

  3. 2. Experimental Investigations of Wave Motion and Electric Resistance in Collisionfree Plasmas

    Författare :Martin Wendt; KTH; []
    Nyckelord :Beam-plasma; Buneman Instability; Density gradient; Double layer; Electric field measurement; Electron beam; Electrostatic eigenmode; Finite element; HF probe; PIC simulation; van der Pol oscillator;

    Sammanfattning : .... LÄS MER

  4. 3. Nonlinear dynamics of frequency sweeping energetic particle modes in tokamaks

    Författare :Frida Eriksson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; wave-particle interaction; Fusion plasma physics; bump-on-tail; toroidal Alfvén eigenmode; holes and clumps;

    Sammanfattning : In a burning plasma, such as the next generation tokamak experiment ITER, significant numbers of highly energetic particles will be produced via nuclear reactions. The presence of energetic particles, be it fusion born alpha particles or ions accelerated by auxiliary heating schemes, may excite kinetic instabilities and thereby affect the heating and transport of all particles in the plasma. LÄS MER

  5. 4. Runaway electrons and Alfvén eigenmodes in tokamaks

    Författare :Håkan Smith; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; two-way diffusion equation; compressional Alfvén eigenmode; fusion plasma physics; tokamak disruption; runaway electron; Alfvén cascade;

    Sammanfattning : Runaway electrons can be generated as a consequence of the rapid thermal quench of the plasma in a tokamak disruption. If the time scale of this cooling is short compared to the collision time in the tail of the electron velocity distribution, incomplete thermalisation of this tail leads to a burst of runaway production. LÄS MER

  7. 5. Prediction of Thermo-Acoustic Properties in Combustion Chambers

    Författare :Guillaume Jourdain; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Design and analysis methods for gas turbine combustors or afterburners need to be improved in particular regarding the prediction of combustion instabilities. A methodology, which combines the use of a linearized flow solver and the Arnoldi algorithm for eigenmode extraction, resolves eigenmodes which are candidates to these instabilities. LÄS MER