高速铁路长大坡道动车组运行性能分析方法

当动车组运行通过长大坡道时，车辆与轨道的耦合振动作用会对列车牵引制动效率产生重要的影响. 为更准确地分析动车组列车通过长大坡道时的运行性能，基于车辆-轨道耦合动力学理论，考虑列车牵引制动行为与线路平纵断面的影响，建立高速铁路长大坡道动车组运行性能分析模型，采用线路试验数据对模型进行验证，对比分析三维模型与传统一维模型的差异，并将模型应用到西安—成都高速铁路（西成高铁）动车组运行性能研究中. 结果表明:本文提出的方法能反映长大坡道对动车组运行速度和动力学性能的影响；传统的一维模型对长大坡道动车组的降速量评估不足，与本方法相比，两者差异为每10 km 5%左右；CRH3A型动车组在西成高铁长大坡道运行会出现严重的降速现象，列车功率提升50%后，降速超过20%的区间减少了7个，全线运行时长缩短了13%，为提高列车运营效率与曲线通过性能，需提高动车组牵引功率. 

An Analytical Method for Train Dynamic Behavior on?Long Steep Grades of High-Speed Railway

The coupled vibration of vehicle and track has a significant effect on the traction and braking effectiveness of trains when they pass through long steep grades. A vehicle-track coupled dynamics model considering train traction/braking behavior and the horizontal/vertical profile of the track is formulated, which is applied to study the dynamic behavior of a train passing through long steep grades. The proposed numerical model is validated by experimental data, which is also validated by comparing with the traditional calculation method. The proposed model is then used to evaluate the running capability of a high-speed train on the steep grades of Xi’an?Chengdu high-speed railway. The result shows that the proposed three-dimensional (3D) method can predict the influences of steep grades on the speed variation and dynamic performances of the trains. Traditional one-dimensional (1D) model underestimates the speed reduction value of the trains travelling on steep grades. The estimated value of speed reduction calculated by 1D method was around 5% less for every 10 kilometers than that calculated by 3D method. A serious deceleration phenomenon occurs when the CRH3A train running through the long steep grades of Xi’an?Chengdu high-speed railway. When the traction power is increased by 50%, the amount of sections where the reduction of speed over 20% is reduced by 7, and the total running time of the trains is 13% fewer. The trains with higher power traction should be adopted to increase the operational efficiency and enhance curving performance when passing through Xi’an?Chengdu high-speed railway.