Sökning: "Normal mode analysis"

Visar resultat 1 - 5 av 58 avhandlingar innehållade orden Normal mode analysis.

  1. 1. Computer simulations of condensed phases with icosahedral local order

    Författare :Sergei Simdyankin; Paul Madden; Stockholms universitet; []
    Nyckelord :SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; simple liquids; glasses; liquid-glass transition; Frank-Kasper phase; molecular dynamics; phonon dispersion; normal-mode analysis; wavelet analysis; numerisk analys; Numerical Analysis;

    Sammanfattning : Understanding the fundamental aspects, and the formation mechanisms of glasses remains an outstanding unsolved problem of condensed-matter physics.Glass-formation in simple atomic systems is generally associated with the icosahedral local order. LÄS MER

  2. 2. Numerical Methods for Aeroacoustic Analysis of Turbomachines

    Författare :Daniel Lindblad; Chalmers University of Technology; []
    Nyckelord :NATURVETENSKAP; TEKNIK OCH TEKNOLOGIER; NATURAL SCIENCES; ENGINEERING AND TECHNOLOGY; Acoustic Analogy; Nonreflecting Boundary Conditions; Time Sampling; Ffowcs Williams - Hawkings; Duct Modes; Tonal Noise; Turbomachinery; Aliasing; Harmonic Balance; Stability Analysis;

    Sammanfattning : Numerical simulations are important tools for developing new aircraft that can meet future needs. When numerical simulations are used to compute aircraft noise, a two-step procedure is often employed. In the first step, the noise sources are determined using, e.g. LÄS MER

  3. 3. Safety Evaluation of Concrete Structures with Nonlinear Analysis

    Författare :Hendrik Schlune; Chalmers University of Technology; []
    Nyckelord :concrete; reliability; nonlinear analysis; modelling uncertainty; model updating; concrete structures; safety format; structural identification;

    Sammanfattning : Concrete is the most widely used construction material in the world. To obtain effective new constructions and to use existing concrete structures in an optimal way, accurate structural models are needed. LÄS MER

  4. 4. Finite Difference and Discontinuous Galerkin Methods for Wave Equations

    Författare :Siyang Wang; Gunilla Kreiss; Thomas Hagstrom; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Wave propagation; Finite difference method; Discontinuous Galerkin method; Stability; Accuracy; Summation by parts; Normal mode analysis; Beräkningsvetenskap med inriktning mot numerisk analys; Scientific Computing with specialization in Numerical Analysis;

    Sammanfattning : Wave propagation problems can be modeled by partial differential equations. In this thesis, we study wave propagation in fluids and in solids, modeled by the acoustic wave equation and the elastic wave equation, respectively. LÄS MER

  5. 5. Fracture mechanics analysis of concrete structures

    Författare :Ulf Ohlsson; Luleå tekniska universitet; []

    Sammanfattning : This thesis presents results from numerical and analytical analyses of concrete structures as well as results from laboratory tests. Numerical methods based on the finite element method and fracture mechanics are used. The thesis comprises five papers and a general introductory part. LÄS MER