中文摘要：

为实现横风下车辆．轨道耦合动力学和列车空气动力学之间的联合仿真，提出一种快速高效计算的平衡状态方法。在忽略轨道不平顺情况下，轮流交替求解稳定气动力作用下的车辆-轨道耦合动力学响应以及稳定姿态下的列车流场和气动力；通过收敛准则判定横风下高速列车的平衡状态；将平衡状态下的稳定气动力加载车辆一轨道耦合动力学并计算高速列车动力学响应。研究横风速度为13．8m／s时高速列车以350km／h运行的流固耦合动力学行为。比较平衡状态方法、交互式联合仿真和离线仿真三种计算方法关于气动力和安全性指标结果的差异，研究结果表明，采用平衡状态方法与交互式联合仿真方法的计算结果差异较小，但平衡状态方法的计算效率远高于交互式联合仿真方法的计算效率。

英文摘要：

In order to achieve the co-simulation between train aerodynamics and vehicle-track coupling dynamics in crosswind, a fast and high-efficiency equilibrium state method is presented. Firstly, vehicle-track coupling dynamics responses to steady aerodynamic forces and train aerodynamics under steady attitude state are solved alternatively ignoring track irregularity. The equilibrium state is obtained by judging convergence criterion. The static forces of train in equilibrium state are loaded to the model of vehicle-track coupling dynamics and the responses of high-speed train are calculated. The fluid-structure dynamics of a high-speed train are simulated under the case that the velocity of crosswind is 13.8 m/s and running speed of train is 350 km/h. The differences in aerodynamic forces and safety indexes calculated with equilibrium state method, alternative co-simulation and off-line simulation are compared. The results show that there is little difference in results calculated with equilibrium state method and alternative co-simulation; however, the calculation efficiency of equilibrium state method is much higher than that of alternative co-simulation.