Progress in the Development of Track Dynamic Models and Associated Numerical Methods

摘要

With increase of train speeds and axle loads,interactions between the vehicle and the track are being intensified.Studying wheel/rail interaction mechanism thoroughly is very important to safety and stability of high speed and heavy railways in operation.In this paper,a brief literature review is given for the progress of numerical models employed in track dynamics,followed by introductions of five track dynamic models and associated numerical methods,i.e.,stagger and iterative algorithm for non-linear vehicle,track and subgrade coupling system,new types of vehicle element and track element,moving element method for train-track dynamics,multi-layer beam model subjected to moving loads at constant velocity along an infinite track,and dynamic analysis of track,subgrade and soil system by coupling finite elements with boundary elements.Merits and drawbacks for above five approaches are discussed.These approaches are efficient numerical methods in analyses of track dynamics.In order to improve computational accuracy and efficiency,suitable approaches should be chosen based on characteristics of the concerned problem.