Sökning: "Vågutbredning"

Visar resultat 1 - 5 av 10 uppsatser innehållade ordet Vågutbredning.

  1. 1. Computation of Acoustic Wave Propagation Under Water

    Master-uppsats, KTH/Matematik (Avd.)

    Författare :Frida Thörn; [2022]
    Nyckelord :Wave equation; Helmholtz equation; Waveholtz iteration; finite difference method; summation by parts; energy method; point source; curvilinear coordinates; vågekvationen; helmholtz ekvation; waveholtz iteration; finita differens methoden; energimetoden; punktkälla; kurvlinjära koordinater; kroklinjiga koordinater; SBP;

    Sammanfattning : In this thesis we look at acoustic wave propagation under water. We look in particular at waves generated by a point source and what happens with the propagation when we model the bottom as flat or as curvilinear. We assume the source to be working at a certain frequency and therefore we model this problem by solving the Helmholtz equation. LÄS MER

  3. 2. Numerical Simulations of Wave Propagation between a Left-Handed Material and a Right-Handed Material

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

    Författare :Balwan Rana; [2021]
    Nyckelord :Negative-Index Material; NIM; Positive-Index Material; RHM; Backward- Wave Propagation; Step-Index Interface; Graded-Index Interface; Left-Handed Material; LHM; Right-Handed Material; RHM; Analytical Solution; Validation; Negativt-Index Material; NIM; Positivt-Index Material; PIM; Bakåtvåg-utbredning; Steg-Index Gränssnitt; Gradering-Index Gränssnitt; Vänsterhänt Material; LHM; Högerhänt Material; RHM; Analytisk Lösning; Validering;

    Sammanfattning : The discovery of metamaterials has led to major advances in different fields of physics including optics, microwave engineering and acoustics. Specific to theoretical electromagnetism, the introduction of metamaterials have led to the development of negative-index materials (NIMs) with simultaneous negative permittivity and negative permeability with backward-wave propagation. LÄS MER

  4. 3. Electromagnetic Phase Engineering With Metamaterials

    Master-uppsats, KTH/Tillämpad fysik

    Författare :Olof Sjödin; [2021]
    Nyckelord :Applied Physics; Electromagnetism; Metamaterials; MIM; Plasmonics; FEM; Reflector design; Phase engineering; Tillämpad fysik; Elektromagnetism; Metamaterial; MIM; Plasmonics; FEM; Reflektor design; Fasdesign;

    Sammanfattning : Metamaterials are artificially designed materials with desired electromagneticresponses for advanced wave manipulation. Their key constituent is often somenoble metal, thanks to its well localized plasmonic effects with highextinction cross section. LÄS MER

  5. 4. On the Influence of Scattering From a Power-pole on an Airport Radar

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

    Författare :Ao Hu; [2019]
    Nyckelord :Power-pole; VOR System; Airplane; EFIE; MOM; RWG; Scattering.; Kraftstolpar; VOR Systemet; flygplan; EFIE; MoM; RWG; Spridning;

    Sammanfattning : Power-poles are one of the common massive conducting structures in cities and countryside. To fulfill the remarkable increased electric power demand nowadays, the number and the size of power-poles are also growing over the past few decades. LÄS MER

  7. 5. Numerical simulations of energy absorbing boundaries for elastic wave propagation in thick concrete structures subjected to impact loading

    Master-uppsats, Institutionen för fysik

    Författare :Daniel Olsson; [2012]
    Nyckelord :Numerical simulations; elastic media; wave propagation; concrete; impact loading; energy absorbing boundaries; longitudinal; primary wave; secondary wave; shear; Rayleigh damping; Rayleigh wave;

    Sammanfattning : As many of the world’s nuclear power plants are near the end of their supposed life span a need arise to assess the components crucial to the safety of these plants. One of these crucial components is the concrete reactor confinement; to assess its condition, non-destructive testing (NDT) is an attractive method. LÄS MER