This article deals with the characterisation of wheel/rail contact geometry for measured or the theoretical wheel and rail profile assessments during the vehicle testing or for the specification of multi-body simulations. First, the traditional characterisation ol wheel/rail contact geometry using the quasi-linearisation and its limitations are presented. Then, the effect of the nonlinearity of the contact geometry wheelset/track on the behaviour of vehicles at the stability limit is shown. A new description characterising the wheel/rail contact geometry by two parameters is presented. The first parameter allows assessment of the vehicle performance regarding the instability safety limit as specified in EN 14363 [1]. The newly introduced, second parameter allows assessment of the expected behaviour at the stability limit: either a sudden flange-to-flange limit cycle or a limit cycle with a small amplitude growing with increasing speed. This parameter also shows the sensitivity of the vehicle to the lateral excitation by track irregularities. The proposed wheel/rail contact geometry description is compared using six examples of contact geometries wheelset/track, with three different levels of equivalent conicity. The relationship between the characteristic parameters, bifurcation at the stability limit, critical speed and dynamic behaviour of a vehicle on measured track irregularities are shown. The presented definition of characteristic parameters allows an improved but still comprehensive description of nonlinear wheel/rail contact geometry. It could contribute to the better understanding of railway vehicle behaviour for different wheel/rail contact conditions during testing, more exact assessment of wheel conditions (check for need for wheel maintenance), rail profiles (check for need for rail maintenance) and more detailed specification of the wheel/rail contact geometry in multi-body simulations.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Characteristic parameters of nonlinear wheel/rail contact geometry


    Additional title:

    Charakteristische Parameter der nichtlinearen Rad-Schiene-Kontaktgeometrie


    Contributors:


    Publication date :

    2010


    Size :

    18 Seiten, 14 Bilder, 28 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Characteristic parameters of nonlinear wheel/rail contact geometry

    Polach, Oldrich | Taylor & Francis Verlag | 2010


    Characteristic parameters of nonlinear wheel/rail contact geometry

    Polach,O. / Bombardier Transportation,CH | Automotive engineering | 2010


    Wheel/rail contact geometry inspection

    Simmons-Boardman Publishing Corporation 345 Hudson St., 12th Floor USA - 10014 New York | IuD Bahn | 2010