高速列车横风作用下的非定常气动载荷计算模拟

为模拟横风环境下高速列车所受气动载荷，选择Karman修正风速谱为目标谱，采用线性滤波法（AR模型）模拟了随列车移动点的脉动风速时程。基于风速风压关系，分析了气动载荷的计算方法，引入气动导纳函数，计算了高速列车横风作用下的非定常气动载荷，最后通过MATLAB编程实现非定常气动力的模拟。通过对列车运行速度70 m/s、平均风速为25 m/s工况下的脉动风速及非定常气动力的计算模拟，结果表明，风速时程能量主要集中在0~3 Hz频域段，与列车系统固有的一些振动频率相近，存在引起列车系统共振、引发倾覆事件的可能。

Calculation and Simulation for Unsteady Aerodynamic Loads of High Speed Trains Under Crosswind

To simulate aerodynamic load of high speed train under crosswind, the Karman modified wind speed spectrum is selected as target spectrum, a fluctuating wind speed time history of a moving point shifting with the train is simulated by linear filter method (AR model). Based on the relationship of wind speed and wind pressure, the calculation method of aerodynamic load is analyzed, and the aerodynamic admittance function is introduced in this paper, unsteady aerodynamic loads of high speed train under crosswind is calculated, the simulation of unsteady aerodynamic force is realized by MATLAB programming. Calculation and simulation of fluctuating wind speed and unsteady aerodynamic force of the train running speed 70m/s and the average wind speed of 25m/s is carried out, the result shows that the energy of the wind speed is mainly concentrated in the 0~3 Hz frequency domain, which is closed to the resonant frequency of the train system, and there may be a possibility of the resonance of the train system and the possibility of the overturning event.