高速列车交会时气流诱发振动的仿真研究

Simulation Research on Vibration Caused by Airflow While High Speed Trains Passing Each Other

建立了CRH2型动车组的简化几何模型和50个自由度的车辆动力学模型。采用有限体积法对三维瞬态可压缩雷诺时均N-S方程和k-ε两方程湍流模型进行求解,并通过多体动力学计算得到了列车的动力学响应。详细分析了列车交会过程中气动力的变化与两列车相对位置的关系。研究发现:气动力在列车交会的短时间内发生迅速变化,气动力在高速列车交会过程中的作用非常明显,导致列车剧烈振动,列车的安全性和舒适性明显降低。

The simplified geometric model of the CRH-2 multiple units and the vehicle dynamics model with 50 degrees of freedom are set up.The finite volume method is used to make solution with the turbulent models of the three-dimensional,transient,compressible Reynolds averaged N-S equation and k-ε equation,and the dynamics response of train is obtained through the multi-body dynamics calculation.The change of aerodynamic force in the course of two trains passing each other and the relation between relative positions of two trains are analyzed in detail.The research founds that the aerodynamic force changes rapidly in short time of trains passing each other,the effect of the aerodynamic force is obvious in course of high speed trains passing each other,causing trains to vibrate voilently,thus,the safety and comfortability of the train are reduced greatly.