Keywords: railway vehicle, derailment experiment, half-car, post-derailment dynamic model, collision detection model, contact force model.

In order to investigate the post-derailment dynamic behaviour of railway vehicles, a derailment experiment has been carried out and a post-derailment model of half a car was proposed. The laboratory tests showed that a variety of contact occurred after derailment, such as wheel-track contact, gearbox-rail contact, and motor-rail contact. The simulation model is composed of three parts, namely, the dynamic model, the collision detection model and the contact force model. The dynamic model takes the effect of all kinds of contact that may occur into consideration. The collision detection model based on tight-fitting oriented bounding box trees is introduced to detect contact conditions. The Hertz spring-damper contact force model and Coulomb friction law are adapted to compute the contact force. The simulation results are consistent with the experimental results. Accordingly, the collision detection model and contact force model adapted in the post-derailment dynamic model of half car can be used in the post-derailment simulation to detect contact conditions and compute the contact force.

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