轨道动力学模型与数值方法研究进展

随着列车速度的提高和轴重的增加,车辆与轨道之间的相互作用更加激烈.深入开展轮轨动态作用机理研究,对高速重载铁路安全平稳运行具有重要意义.文章回顾了轨道动力学模型的研究进展,重点介绍了五种轨道动力学模型及算法,即车辆-轨道-路基非线性耦合系统交叉迭代算法,新型车辆单元和轨道单元模型,列车轨道系统动态分析的移动单元法,移动...

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

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.,crossing 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 models 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 models and numerical approaches are important basis and means 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.