摘 要:为了阐明高速列车交会过程中气动力对列车的系统动力学行为的影响,分别建立了CRH-2动车组的简化几何模型和50个自由度的车辆系统动力学模型。采用有限体积法对三维瞬态可压缩雷诺时均Navier-Stokes方程和k-e 两方程湍流模型进行求解,并通过滑移网格技术实现列车的运动,对考虑和不考虑气动力时的列车系统力学响应进行了数值模拟,并对两种情况下列车的安全性和舒适性进行了分析讨论。研究发现:气动力在列车交会过程中变化剧烈,对列车系统动力学行为的影响非常明显,交会时列车振动剧烈,头车和尾车的安全性和舒适性明显降低。
Considering the effects of the aerodynamics, vehicle dynamic responses of high-speed train in passing events are studied in this paper. For obtaining the aerodynamic load, a simplified geometry model of high-speed train (CRH-2) is built, and a 50-degree-of-freedom dynamic system is represented for modeling each of three cars which constitute the train, the three-dimensional compressible Reynolds-averaged Navier-Stokes equation, combined with the k-e two equations turbulence model, was solved by using finite volume method, and the motion of the train is carried out by using sliding meshes. The response of the train consider aerodynamic load or not are calculated by Multi-Body Simulation. The safety and riding quality of the train in passing events considering aerodynamics or not are discussed. It is found that, the aerodynamic force changes rapidly in the process of passing events, the aerodynamics has obvious effect on the vehicle system dynamics, which cause the train drastic vibration, the most serious deterioration of safety and riding quality can be found at the leading and tail car.