Essays about: "Perfectly Matched Layer"

Showing result 1 - 5 of 8 essays containing the words Perfectly Matched Layer.

  1. 1. Efficient Calculations of Two-Dimensional Radar Cross-Section Using DGFEM

    University essay from Uppsala universitet/Avdelningen för beräkningsvetenskap

    Author : Daniel Persson; [2020]
    Keywords : numerical methods; DGFEM; discontinuous Galerkin; finite element method;

    Abstract : A two-dimensional discontinuous Galerkin finite element method algorithm in the time domain was developed for calculation of the radar cross-section of an arbitrary object. The algorithm was formed using local nodal basis functions in each element and coupling them via numerical upwind flux. READ MORE

  3. 2. Underwater probe for deep sea exploration : Long range acoustic underwater communication system

    University essay from Luleå tekniska universitet/Institutionen för system- och rymdteknik

    Author : Kim Nykvist; [2020]
    Keywords : Acoustic communication; temperature; Expendable Bathythermograph; XBT;

    Abstract : This was a thesis that was commissioned by Researcher Peter Sigray at the Royal Institute of Technology (KTH) in Stockholm and was based on an idea by Professor Thomas Rossby, University of Rhode Island (URI). The idea was to further develop the existing Expendable Bathythermograph (XBT), which has been in use since the 1960s. READ MORE

  4. 3. Soil-Structure Interaction Analysis of Portal Frame Railway Bridges : Numerical Analysis of Two Case Study Bridges

    University essay from KTH/Bro- och stålbyggnad

    Author : Nils Sandqvist; Marko Milicevic; [2020]
    Keywords : Soil-structure Interaction; Portal Frame Bridge; Dynamic Analysis; Perfectly Matched Layer; Train Passage Analysis; Railway Bridge; High Speed Train v;

    Abstract : This thesis concerns dynamic Soil-Structure Interaction (SSI) analysis of portal framerailway bridges. Dynamic problems are common for bridges used for high speedrailway traffic. The passing trains induce harmonic loads on the bridges causingvibration amplitudes that may cause damage to the bridge structures and userdiscomfort. READ MORE

  5. 4. Evaluation, adaption and implementations of Perfectly Matched Layers in COMSOL Multiphysics

    University essay from KTH/Numerisk analys, NA

    Author : Simon Erlandsson; [2020]
    Keywords : Applied mathematics; computational mathematics; finite element method; FEM; perfectly matched layer; PML; COMSOL; Tillämpad matematik; beräkningsteknik; finita elementmetoden; FEM; PML; COMSOL;

    Abstract : Perfectly matched layer (PML) is a commonly used method of absorbing waves at a computational boundary for partial differential equation (PDE) problems. In this thesis, methods for improving the usability of implementations in Comsol Multiphysics is addressed. READ MORE

  6. 5. Dynamic Soil-Structure Interactionof Soil-Steel Composite Bridges : A Frequency Domain Approach Using PML Elements and Model Updating

    University essay from KTH/Bro- och stålbyggnad

    Author : DIEGO FERNANDEZ BARRERO; [2019]
    Keywords : Dynamics; soil-steel bridges; soil-structure interaction; model updating; PML; particle swarm; corrugated steel plates; frequency domain assurance criteria; parallel computing 2;

    Abstract : This master thesis covers the dynamic soil structure interaction of soil-steel culverts applyinga methodology based on the frequency domain response. At the first stage of this masterthesis, field tests were performed on one bridge using controlled excitation. READ MORE