Sökning: "finite differences"

Visar resultat 6 - 10 av 142 avhandlingar innehållade orden finite differences.

  1. 6. Numerics of Elastic and Acoustic Wave Motion

    Författare :Kristoffer Virta; Gunilla Kreiss; Anders Petersson; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; finite differences; stability; high order accuracy; elastic wave equation; acoustic wave equation; Beräkningsvetenskap med inriktning mot numerisk analys; Scientific Computing with specialization in Numerical Analysis;

    Sammanfattning : The elastic wave equation describes the propagation of elastic disturbances produced by seismic events in the Earth or vibrations in plates and beams. The acoustic wave equation governs the propagation of sound. LÄS MER

  3. 7. Finite Element Modeling of the Human Head

    Författare :Svein Kleiven; KTH; []
    Nyckelord :Finite element method FEM ; Human head; brain; head injury; epidemiology; statistics; simulations.;

    Sammanfattning : The main objectives of the present thesis were to define the dimension of head injuries in Sweden over a longer period and to present a Finite Element (FE) model of the human head which can be used for preventive strategies in the future. The annual incidence of head injuries in Sweden between 1987 and 2000 was defined at over 22 000, cases most of which were mild head injuries. LÄS MER

  4. 8. Stable FEM-FDTD Hybrid Method for Maxwell's Equations

    Författare :Thomas Rylander; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Finite Element Method; scattering; antennas; stability analysis; edge elements; Maxwell s equations; NASA almond; microwave circuits; mass lumping; proof of stability; explicit-implicit time-stepping; Finite-Differences Time-Domain;

    Sammanfattning : In this thesis edge elements are applied to solve several problems in computational electromagnetics. In particular, a hybrid scheme joining the Finite Element Method (FEM) and the Finite-Difference Time-Domain (FDTD) algorithm is developed, tested and exploited. LÄS MER

  5. 9. The application of edge elements in electromagnetics

    Författare :Thomas Rylander; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; finite-differences time-domain; stability analysis; NASA almond; finite element method; edge elements; scattering; mass lumping;

    Sammanfattning : .... LÄS MER

  7. 10. Mechanical Characterisation of Coatings and Composites-Depth-Sensing Indentation and Finite Element Modelling

    Författare :Zhi-Hui Xu; KTH; []
    Nyckelord :dept-sensing indentation; nanoindentation; finite element method; atomic force microscope;

    Sammanfattning : In the past two decades depth-sensing indentation has becomea widely used technique to measure the mechanical properties ofmaterials. This technique is particularly suitable for thecharacterisation of materials at sub-micro or nano scale thoughthere is a tendency to extend its application to the micro ormacro scale. LÄS MER