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.
A numerical study of the derailment caused by collision of a rail vehicle using a virtual testing model
Numerische Studie einer Entgleisung verursacht durch den Aufprall eines Schienenfahrzeug unter Verwendung eines virtuellen Versuchsmodells
Vehicle System Dynamics ; 50 , 1-3 ; 79-108
2012
30 Seiten, 58 Bilder, 4 Tabellen, 14 Quellen
Article (Journal)
English
Automotive engineering | 2012
|Taylor & Francis Verlag | 2012
|Derailment investigations of rail vehicles during collision accidents
Tema Archive | 2014
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