Sökning: "variable step-size"

Visar resultat 1 - 5 av 11 uppsatser innehållade orden variable step-size.

  1. 1. Modelling and Simulation of Complete Wheel Loader in Modelica : Evaluation using Modelon Impact software

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

    Författare :Paolo Teta; [2022]
    Nyckelord :Modelica; Wheel Loader; Mechanics; Object-orientation; Modelling; Simulation; Differential Algebraic Equations; Ordinary Differential Equations; Modelica; Hjullastare; Mekanik; Objektorientering; Modellering; Simulering; Differentialekvationer;

    Sammanfattning : Modelling and simulation of complex and multi-domain mechanical systems has become of major importance in the last few years to address energy and fuel consumption performance evaluation. The goal is to unify the available modelling languages aiming to improve scalability and easiness of handling complex multi-domain models. LÄS MER

  3. 2. Comparing Multistep Methods Within Parametric Classes to Determine Viability in Solver Applications

    Master-uppsats, Lunds universitet/Matematik LTH; Lunds universitet/Matematik (naturvetenskapliga fakulteten); Lunds universitet/Matematikcentrum

    Författare :Michael Andrew Kraut; [2021]
    Nyckelord :Ordinary Differential Equations; Initial Value Problems; Linear Multistep Methods; Numerical Analysis; Numerical Solvers; Parametrized; Algorithms; Control Theory; Mathematics and Statistics;

    Sammanfattning : In the 2017 paper by Arévalo and Söderlind, a framework was established for creating linear multistep methods of various classes based on a polynomial formulation which includes variable step size adaptivity. These classes are: k step explicit and implicit methods of order k and k+1 respectively for nonstiff problems (such as Adams methods), and k step implicit methods of order k for stiff problems (such as BDF methods). LÄS MER

  4. 3. Finita differens-metoder för reservoarsimulering

    Kandidat-uppsats, KTH/Skolan för teknikvetenskap (SCI)

    Författare :Simon Falk; [2019]
    Nyckelord :;

    Sammanfattning : Tillförlitliga beräkningsverktyg är generellt av stor betydelse för att förstå processerna i världen omkring oss, och i synnerhet är simulering av flöden i reservoarer viktigt för att kunna bemöta vår tids stora krav. Exempelvis är stabil grundvattenförsörjning, hållbar utvinning av olja, och säker förvaring av kärnavfall beroende av reservoarsimuleringar. LÄS MER

  5. 4. Construction and benchmarking of adaptive parameterized linear multistep methods

    Master-uppsats, Lunds universitet/Matematik LTH

    Författare :Josefine Olander; Erik Jonsson Glans; [2016]
    Nyckelord :Linear multistep method; matlab software; variable step-size; variable order; numerical solver of ODEs; Mathematics and Statistics; Technology and Engineering;

    Sammanfattning : A recent publication introduced a new way to define all k-step linear multistep methods of order k and k+1, in a parametric form that builds in variable step-size. In this framework it is possible to continuously change method and step-size, making it possible to create better behaving adaptive numerical solvers. LÄS MER

  7. 5. Common Envelope Evolution

    Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

    Författare :Robert Wissing; [2016]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : We present simulations done on the onset of common envelope evolution with giant donors by taking into account the mass loss through the outer Lagrange point and the forming of the common envelope. In addition we apply proper stellar models and evolve our simulations using an Runge-Kutta integrator with adaptive step-size. LÄS MER