基于姿态变化的列车侧风安全性研究的新方法

针对列车空气动力学与列车系统动力学联合同步仿真的耗时问题，提出一种新的基于Arbitrary Lagrangian Eulerian (ALE)的列车空气动力学与列车系统动力学联合仿真方法。首先，分别建立列车侧风计算流体动力学模型和列车多体系统动力学模型。然后，通过参数传递、求解控制和动态网格的使用实现列车侧风计算流体动力学和列车多体系统动力学的联合仿真，其中列车系统动力学模型不考虑轨道激励，侧风环境下列车以平衡状态逐步逼近最终平衡状态，从而以更快的计算速度得到侧风环境下列车的稳定姿态和该姿态下的气动载荷。最后将此气动载荷加载到列车多体系统动力学模型，并考虑轨道激励，进行动力学分析，评价侧风环境下列车的安全性指标。

A new method to study on safety of train with attitude changing in side wind

In order to treat the time-consuming problem of synchronous simulation of aero-dynamics and dynamics of train system, a new simulation method is proposed based on the Arbitrary Lagrangian Eulerian(ALE). First, the models for side-wind computational fluid dynamics and train multibody system dynamics are built up respectively. Then, the combined simulation is performed through parameters passing, solution control and dynamic grid, where the track excitations are not considered, the final equilibrium state of train in side-wind is acquired state by state, and the steady attitude and the corresponding aerodynamic loads caused by the side-wind are computed more efficiently. Finally, the aerodynamic loads and track excitations are applied on the train multibody system, the dynamical performance and safety index is analyzed.