基于高速列车运行高度的风速模拟与安全预警模型OA

To investigate the operating risks of high-speed trains under wind environments at different operating heights,wind-speed variations at different operating heights were simulated.First,the mechanisms by which wind affects high-speed train operation were systematically analyzed from the perspectives of the pantograph,the train,and high-speed railway infrastructure.Second,a natural wind model considering both mean and fluctuating wind was established.On this basis,the relationships between mean wind speed and friction velocity with operating height were analyzed;the method and corresponding procedure for simulating fluctuating wind were determined;and a wind-speed monitoring and early-warning system for high-speed trains was designed in accordance with train speed-limit standards under strong-wind conditions.Finally,wind-speed simulation experiments and corresponding analyses were conducted using the specified basic parameters.On the one hand,changes in wind speed and the power spectrum at a height of 5 m were investigated,and the early-warning function of the system was analyzed.On the other hand,five operating heights at 10 m intervals starting from 5 m were selected;changes in wind speed and the power spectrum at these heights,as well as changes in the mean,maximum,and minimum wind speeds,were examined.The results indicate that wind speed at a given operating height fluctuates continuously;at a height of 5 m,wind speed is mainly concentrated between 17 and 34 m/s.Wind speed generally increases with operating height.These findings provide a theoretical reference for mitigating wind-related operating risks of high-speed trains at different operating heights and offer guidance for railway operating departments in further developing safety early-warning systems for high-speed trains.