Sökning: "Wheel-rail contact"

Visar resultat 1 - 5 av 14 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. On estimating the risk of wheel damage for wagons with paper rolls considering various dynamic conditions

    Master-uppsats, KTH/Spårfordon

    Författare :Robin Prevolnik; [2016]
    Nyckelord :;

    Sammanfattning : Hector Rail AB is a Swedish line haul provider for the European Rail Transport Market. On one of their lines, Hector Rail transports large cylinder-shaped paper rolls of different sizes from Holmsund to Skövde, and compressed recycled paper back to Holmsund, with Y25 bogie wagons. LÄS MER

  4. 4. Estimation of wheel-rail friction at vehicle certication measurements

    Master-uppsats, KTH/Spårfordon

    Författare :Márton Pálinkó; [2016]
    Nyckelord :;

    Sammanfattning : In certification of new rail vehicles with respect to running characteristics, a wide variety of operating conditions needs to be considered. Behaviour on straight and curved tracks, including twisted tracks at various speeds, is of great importance. However, the wheel-rail friction should always be high corresponding to dry conditions. LÄS MER

  5. 5. The potential of Fluid Dynamic Absorbers for railway vehicle suspensions

    Master-uppsats, KTH/Spårfordon

    Författare :Visakh V Krishna; [2016]
    Nyckelord :;

    Sammanfattning : The main running objectives concerning the vertical dynamics of passenger rail vehicles are ride comfort and safety. The goal of this thesis is to employ the use of a Fluid Dynamic Absorber to minimize the vertical acceleration of the car body while minimizing the dy-namic force fluctuations in the wheel rail contact. LÄS MER