中文摘要：

将轨道结构视为一个参数随机系统,提出并建立了轨道结构的随机场模型.利用车辆-轨道耦合动力学的基本方法,将轨道系统有限单元模型与多刚体车辆模型相结合,建立了考虑铁路线路参数空-时随机变化的车辆-轨道动力计算模型.算例表明：所提出的方法较为可靠且高效;线路参数随机性对车辆-轨道系统的动力响应有明显的影响,随线路参数离散程度的增加,可能造成行车不安全、轨道损伤加剧等一些问题.

英文摘要：

In view of the track structure as a system with stochastic parameters, the random field model for railway track systems was proposed and constructed. Then the finite element model for the track system and the multi-rigid-body model for the vehicle system were coupled based on the fimdamental principle of vehicle-track coupled dynamics to establish the vehicletrack stochastic analysis model in which the temporal-spatial random variances of rail line parameters were taken into consideration. The numerical examples show that the proposed meth- ods are reliable and efficient, and the randonmesses of railway line parameters have significant influences on dynamic responses of railway vehicle-track systems： for example, running insecurity of vehicles and damage aggravation of track structures may grow with the increases of vari- ances of track structure parameters.