Sökning: "Wheel-rail contact"

Visar resultat 1 - 5 av 17 uppsatser innehållade orden Wheel-rail contact.

  1. 1. Simulation of air quality in underground train stations

    Master-uppsats, KTH/Maskinkonstruktion (Inst.)

    Författare :Benjamin Söderberg; [2020]
    Nyckelord :PM10; aerosols; air pollution; particulate matter; emission factors; underground train station; PM10; luftkvalité; tåg; emissionsfaktorer; underjordiska tågstationer;

    Sammanfattning : Particulate matter (PM) is a widespread air pollutant of microscopic particles that are suspended in the atmosphere. There is high concentration of PM in underground train stations and tunnels. The concentration of particulate matter (PM10) measured in Stockholm’s metro varies significantly between day and nighttime traffic of trains. LÄS MER

  3. 2. Improvement of Steering Performance of a Two-axle Railway Vehicle via Look-up Tables Estimation

    Master-uppsats, KTH/Spårfordon

    Författare :Prapanpong Damsongsaeng; [2020]
    Nyckelord :Two-axle railway vehicle; Active steering system; Look-up tables; Time-varying wheel-rail contact parameters; Två-axligt järnvägsfordon; aktiv styrning; uppslagstabeller; tidsvarierande hjul-rälskontaktparametrar;

    Sammanfattning : A conceptual design of an innovative two-axle lightweight railway vehicle for commuter services is carried out at KTH Railway Group. An active wheelset steering is introduced to improve the curving performance of the vehicle, which is one of the critical performance requirements. LÄS MER

  4. 3. 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

  5. 4. 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

  7. 5. 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