This study investigated the wheel-lift and roll-over derailment mechanisms caused by train collisions using a precise virtual testing model (VTM) of a Korean high-speed train. The VTM was a complex, nonlinear finite element model composed of the shell, beam, solid, spring, and surface contact elements for the car body, bogies, suspensions, and wheel-rail interfaces. The VTM was validated by checking the errors in the total energy and the dynamic responses of the spring elements, To achieve a quick, dynamic relaxation of the dead weight of the VTM before the collision analysis, the artificial damping method and the artificial force method were introduced and numerically evaluated. The surface-to-surface contact model from commercial software, Ls-Dyna, was applied to the VTM in order to simulate the derailment mechanisms caused by collision accidents. The numerical analyses of the VTM colliding with a large deformable obstacle or a rigid wall revealed for the first time that a mixed slip/roll-over-type derailment mechanism generally occurs. Furthermore, the simulation results were consistent with the results from a simplified theoretical derailment model of a wheel set.


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    Titel :

    A numerical study of the derailment caused by collision of a rail vehicle using a virtual testing model


    Weitere Titelangaben:

    Numerische Studie einer Entgleisung verursacht durch den Aufprall eines Schienenfahrzeug unter Verwendung eines virtuellen Versuchsmodells


    Beteiligte:
    Cho, Hyun Jik (Autor:in) / Koo, Jeong Seo (Autor:in)

    Erschienen in:

    Vehicle System Dynamics ; 50 , 1-3 ; 79-108


    Erscheinungsdatum :

    2012


    Format / Umfang :

    30 Seiten, 58 Bilder, 4 Tabellen, 14 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch