高速列车-轨道-路基耦合垂向振动特性分析

Analysis of Vertical Vibration Property of High-Speed Train-Track-Subgrade Coupled

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, train running speed and train load unceasing en- hancement, the dynamic load of the track structure beared is continuously increasing. The results of the repeated actions leading to the fatigue failure of the track structure component is more prominent, the re- liability decline and the residual cumulative deformation accelerate; in turn, the destruction of the track structure parts have an influence on train running safety and comfort. Therefore, the problem of Train- Track-Subgrade coupling dynamics is drawing more and more academic attention. Based on the unified model method, a vehicle-subgrade model of the secondary suspension vertically coupled system including the vehicle, rail, sleeper, ballast and subgrade was established, numerical integral was calculated coupled system motion equation with new explicit integral method. The influences of train speed, sleeper spacing, track irregularities and train weight on train running property, dynamic displacement and track structure vibration regulation were analysed. This results provide useful reference on vehicle running speed control and track structure design, construction and maintenance.