Abstract
In this study, we have constructed a detailed contact model between a wheel and track structure to express the post-derailment railway vehicle behavior more accurately, and then we have incorporated the model into the numerical program DIASTARS III which is able to analyze dynamic interaction between the vehicles and structures, and post-derailment railway vehicle behavior. Firstly, we have proposed a method by which the running track is divided into several strips along the rail direction, and the geometric track irregularity and the contact spring between the wheel and the track structure for the each track strip are discretely defined as a function of the position in the rail direction. Secondly, we have proposed a method which can express the phenomenon that the derailed wheel collides with or jumps over the rail. Finally, to verify the proposed methods, we have carried out derailment analyses by using DIASTARS III. We have confirmed the post-derailment vehicle behavior responding to the variation of the geometric irregularities of the running track and the contact springs between the wheel and the track structure. In addition, we have confirmed that the proposed methods can express the phenomenon that the derailed wheel collides with or jumps over the rail.
