Sökning: "Wheel-rail contact"

Visar resultat 1 - 5 av 16 uppsatser innehållade orden Wheel-rail contact.

  1. 1. The Effect of Geometrical Contact Input to Wheel-Rail Contact Model

    Master-uppsats, KTH/Spårfordon

    Författare :Michael Martin; [2018]
    Nyckelord :Wheel-rail contact; geometrical contact input; contact point search; contact patch; rail vehicle.;

    Sammanfattning : Wheel-rail contact is an important aspect of railway, the forces transferred between the wheel and rail are the one that guide, brake, or accelerate the train, and that is why the understanding of the contact between wheel and rail is an interesting research topic. In this master thesis wheel-rail contact model named ANALYN is used to see the effect of the different geometrical input, like undeformed distance, relative longitudinal curvature, and relative lateral curvature calculation affect the contact patch estimation formed at the wheel-rail contact. LÄS MER

  2. 2. An Attempt Towards FE-Modelling of Fracture Propagation in Railway Wheels

    Master-uppsats, KTH/Spårfordon

    Författare :Fred Öhnander; [2018]
    Nyckelord :Railway wheel; Wheel-rail contact; Wear; Fracture initiation; Physical fracture propagation model; FE-model; Fracture mechanics; XFEM; Inclusion; Järnvägshjul; Hjul-räl-kontakt; Slitage; Sprickinitiering; Fysisk sprickbildningsmodell; FE-modell; Frakturmekanik; XFEM; Imperfektion;

    Sammanfattning : The demand for higher velocities and heavier axle loads for freight trains leads to higher forces on the railway wheels which in turn lead to an increase in stresses on and below the surface of the wheel-rail contact. By time, this induces wear on the wheels which consequently lead to higher maintenance costs and in some cases accidents. LÄS MER

  3. 3. A Parameterized Three-Dimensional Finite Element Model of a Slab Track for Simulation of Dynamic Vehicle–Track Interaction

    H-uppsats, Chalmers tekniska högskola/Institutionen för mekanik och maritima vetenskaper

    Författare :Niklas Sved; [2018]
    Nyckelord :;

    Sammanfattning : To meet the increased demands of freight and people transport by trains, the SwedishTransport Administration is evaluating the possibility of constructing new railwaysbased on slab track design. In this work, models of a slab track have been developedin two and three spatial dimensions. LÄS MER

  4. 4. Finite element analysis of thermal fields during repair welding of discrete rail defects

    H-uppsats, Chalmers tekniska högskola/Institutionen för tillämpad mekanik

    Författare :Michele Maria Maglio; [2017]
    Nyckelord :;

    Sammanfattning : Discrete defects in a rail head may form due to aggressive wheel–rail contact in terms of thermal and/or mechanical loads, or due to indentations from foreign objects trapped in the contact. If large, such defects need to be repaired or the rail section removed. These are costly operations that cause operational disturbances. LÄS MER

  5. 5. Design of a Test Rig for Railway Curve Squealing Noise

    H-uppsats, Chalmers tekniska högskola/Institutionen för bygg- och miljöteknik

    Författare :Jannik Theyssen; Arthur Aglat; [2017]
    Nyckelord :squeal; curve; railway; test rig; wheel rail contact; roller; contact modelling; squealing occurrence parameters; mechanical engineering;

    Sammanfattning : Curve squealing noise of railroad vehicles has been researched for over four decades. To describe this phenomenon, several models have been developed. An increasing stick-slip motion between the wheel and the rail is assumed to be a key component for the occurrence of squealing. LÄS MER