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

With the development of high-speed railway,train running speed and train load unceasing enhancement,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 reliability 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.