Essays about: "hjulprofiler"

Found 2 essays containing the word hjulprofiler.

  1. 1. Improving the validation of a railway vehicle model in the virtual certification process

    University essay from KTH/Spårfordon

    Author : Bente de Leeuw; [2021]
    Keywords : Rail vehicle dynamics; Rail vehicles; Rail profiles; wheel profiles; model validation; Dynamik; järnvägsfordon; järnvägsprofiler; hjulprofiler; modellvalidering.;

    Abstract : Before vehicles can be placed in service it has to complete an authorisation process. At the moment,this process is largely depended on tests. This is, however, an expensive and long process. With new technologies and improved simulations this process can be shortened and the costs can be lowered. READ MORE

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

    University essay from KTH/Spårfordon

    Author : Fred Öhnander; [2018]
    Keywords : 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;

    Abstract : 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. READ MORE