Sökning: "wave equation"

Visar resultat 1 - 5 av 61 uppsatser innehållade orden wave equation.

  1. 1. Sound propagation modelling with applications to wind turbines

    Master-uppsats, KTH/Mekanik

    Författare :Julius Fritzell; [2019]
    Nyckelord :Sound propagation; Wind turbines; Wave equation; Helmholtz equation; Fourier transform; Chebyshev polynomials.;

    Sammanfattning : Wind power is a rapidly increasing resource of electrical power world-wide. With the increasing number of wind turbines installed one major concern is the noise they generate. Sometimes already built wind turbines have to be put down or down-regulated, when certain noise levels are exceeded, resulting in economical and environmental losses. LÄS MER

  2. 2. 3D Finite Element Modelling of ICRH in JET

    Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Björn Ljungberg; [2019]
    Nyckelord :;

    Sammanfattning : This master's thesis assesses the possibility of using the nite element method to solve the electromagneticwave equation in a fusion plasma in 3D. In particular, the frequency is chosen to match that of ioncyclotron resonance heating in the fusion experiment JET. LÄS MER

  3. 3. Numerical methods for the wave equation with uncertainty

    Master-uppsats, KTH/Numerisk analys, NA

    Författare :Benjamin David Weber; [2019]
    Nyckelord :;

    Sammanfattning : The problem of uncertainty quantification for the wave equation with random scatterers is explained and motivated. The background of various methods for solving hyperbolic partial differential equations is discussed, and the details of the numerical solution method used are explained. LÄS MER

  4. 4. Decay of solutions to the Klein-Gordon equation on some expanding cosmological spacetimes

    Master-uppsats, Lunds universitet/Teoretisk partikelfysik

    Författare :Amol Sasane; [2019]
    Nyckelord :Klein-Gordon equation; general relativity; FLRW models; Schwarzschild-de Sitter; Reissner-Nordström-de Sitter; Physics and Astronomy;

    Sammanfattning : The decay of solutions to the Klein-Gordon equation is studied in two expanding cosmological spacetimes, namely (1) the de Sitter universe in flat Friedmann-Lemaitre-Robertson-Walker (FLRW) form, and (2) the cosmological region of the Reissner-Nordström-de Sitter (RNdS) model. Using energy methods, for initial data with finite higher order energies, bounds on the decay rates of the solution are obtained. LÄS MER

  5. 5. On two-component Bose-Einstein condensates in a ring

    Kandidat-uppsats, Lunds universitet/Matematik (naturvetenskapliga fakulteten)

    Författare :Marcus Sköld; [2019]
    Nyckelord :Mathematics and Statistics;

    Sammanfattning : A Bose-Einstein condensate is a type of gas consisting of one or more types of particles called bosons which are cooled to a temperature very close the absolute zero. Under these conditions the particles all start to occupy their lowest quantum state. LÄS MER