Analysis of coupler collision characteristics and derailment risk of intercity trains with different initial attitudes
The initial attitude deviations of couplers often exist in train collision,which affects the motion attitude of trains and increases the risk of derailment.In this paper,a nonlinear finite element model of a fully automatic coupler of an intercity train was established,which was verified with the impact experiment of trolly.On this basis,a model of intercity train head car collision was established.The collision characteristics of the couplers and its influence on the derailment risk of the vehicle with initial displacement deviations and angle deviations were studied.The results show that the stability values of pitching angle and yawing angle of couplers gradually increase with the increase of the initial deviations,and the influence of initial attitudes on the angle of coupler is different.The pitching angle is more sensitive to vertical and pitching deviations,while the yawing angle is more sensitive to lateral and yawing deviations.Moreover,the initial attitude has an important effect on the wheelset lift of the driving vehicle.When the pitching angle increases significantly with the increase of the deviations,the vertical force on the car body increases,leading to an increase in the wheelset lift of the bogie and resulting in bigger derailment risk of the vehicle.
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