Reliability Analysis of High-Speed Train Running on Embankment in Crosswind Environment

The aerodynamic calculation model of a high-speed train on the embankment under crosswind is built according to computational fluid dynamic (CFD) theory in order to obtain the aerodynamic forces on the train, and the running process of a high-speed train on the embankment is simulated on basis of multi-body dynamic theory. Furthermore, the crosswind aerodynamic performance and running reliability of a high-speed train on the embankment are studied. Considering the randomness of wind load, the influence of the embankment height, the embankment slope coefficient and the position of the upper/lower wind line, the aerodynamic characteristics of the train are analyzed. At the same time, taking the aerodynamic load as input, considering the different embankment heights, slope coefficients, mean wind velocities and train speeds, the change rules of failure probability for train operation with embankment height, train speed and wind velocity are analyzed, and then the probabilistic characteristic wind curve of the train and running safety area for the train under different embankment heights are obtained. The results show that the aerodynamic coefficients of the train gradually increase as the embankment height increases. When the embankment slope coefficient is the same, the absolute value of aerodynamic factor of the leading car is the largest. The aerodynamic factor of the train running on the downwind line is higher than on the upwind line. If the failure probability is given, the maximum operating speed of the train when the wind speed reaches a certain value can be determined through the probabilistic characteristic wind curve.