高速列车车门稳态风致载荷作用下的载荷谱模拟

Simulation for Unsteady Aerodynamic Load Spectrum of Doors of High Speed Train under Crosswind

考虑随机风载荷对高速列车车门疲劳强度的影响,以某型号高速列车车门结构为研究对象,对风致载荷作用下的车门载荷谱进行模拟.选择Karman修正风速谱作为目标谱,采用贝叶斯信息量准则确定自回归模型阶数,以线性滤波法模拟随列车移动点脉动风速时程.引入气动导纳系数,并结合风速与风压的关系模拟车门的非定常气动载荷.研究成果表明,风速和风压仿真功率谱与其相应的目标谱在仿真频段内均吻合良好,满足车门疲劳强度试验的实施要求.

To examine the impacts of aerodynamic loads on high speed trains’ doors, the door structure of a high-speedtrain is studied by simulating the structure load spectrum based on wind-induced loads. Firstly, Karman modified windspeed spectrum is used as a target spectrum. Then, Bayesian information criterion （ BIC） is adopted to ascertain the orderof AR model. In view of this, a fluctuating wind speed time history of a moving point shifting with the train door is obtained by usinglinear filter method. Based on the methodology of the relationship between wind speed and wind pressure, the aerodynamic admittance function and the aerodynamic weighting function are introduced to calculate theunsteady aerodynamic load of the train’s door. The results show that both the simulation spectrum of forcc have high fitting precision compared with their corresponding target. Hence, the results load spectrum fulfills the requirements for conducting the experiment of the train’s door fatigue strength.