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随着高速铁路的发展,列车运行速度和列车载重的不断提高,轨道结构承受的动载荷不断增大,其反复作用的结果必将导致轨道结构部件疲劳破坏更加突出,可靠性下降,并加速残余累积变形;反过来轨道结构部件的破坏,影响列车行驶的安全性和舒适性。因此,列车-轨道-路基耦合系统动力学问题越来越受到学术界的关注。采用统一模型法,建立车辆、钢轨、轨枕、道床和路基为一体的二系垂向耦合动力分析模型,利用新型显式积分法对耦合系统运动方程进行数值积分计算,分析列车速度、轨枕间距、轨道不平顺及列车重量对列车运行的品质、动位移以及轨道结构振动的影响规律。对车辆运行速度的控制以及对轨道结构设计、施工和养护提供有用的参考。
With the development of high-speed railway, the continuous increase of train running speed and train load, the dynamic load of track structure increases continuously. The result of repeated action will inevitably lead to more prominent fatigue damage of rail structural components, decrease of reliability and acceleration of residual Cumulative deformation; in turn the destruction of track components, affecting the safety and comfort of train driving. Therefore, the dynamics of train-track-subgrade coupling system has drawn more and more attention from academia. By using the unified model method, a two-component vertical coupled dynamic analysis model of vehicle, rail, sleeper, ballast bed and roadbed is established. The new explicit integral method is used to calculate the motion equations of the coupled system by numerical integration. The train speed, sleeper spacing, The impact of track irregularity and train weight on the quality of train operation, dynamic displacement and the vibration of track structure. The control of vehicle speed and the track structure design, construction and maintenance provide a useful reference.