Research on posture evolution behavior and overturning risk of derailed trains on bridges
Aiming at the posture evolution behavior of the car-body and overturning risk of the high-speed train after derailment on the bridge,a multi-body dynamics model of eight marshaling vehicles-bridge protective wall was established and numerical research was carried out through the multi-body dynamics method.Firstly,the correctness of the multi-body dynamics model in this research was verified by comparing the multi-body dynamics results with the finite element method results in the same cases.Then,the dynamic evolution behavior of high-speed train derailment in a straight line running with an empty,straight line running with fully loaded,and a curve running with different centrifugal accelerations were studied respectively through numerical simulation.The results show that after the derailed train collides with the protective wall on the bridge,there will be obvious wheel jumping and large-scale rolling of the car-body,and each car has a great risk of rolling from right rear to left front and falling to the outside of the line.The derailment of a train on a curved bridge is more dangerous than a straight-line derailment,and there will be a significant tail flick phenomenon.The greater the centrifugal acceleration,the more obvious the tail flick phenomenon.
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