The Applications Of The Theory Of Vehicle-Track Coupling Dynamics In Derailment Analysis

Vehicle derailment is a fatal crisis that endangers the safe railway transport. In order to decrease train derailment, many scientists of internal and overseas study the cause of vehicle derailment and it's inherent mechanism. In china, presently we usually use derailment coefficient and reduction rate of wheel load to evaluate and analyze, but there is a limit. In fact, train derailment is a joint result of interactions between subsystems of railway system under certain conditions.Based on the theory of vehicle-track coupling dynamics and the vehicle-track spatially coupling model, using the wheel/rail spatially dynamics contact model, the paper proposed a direct method named wheel-rail contact point to evaluate vehicle derailment. In order to verify the method and the DSCP software, as an example, a Ce2 freight car was simulated on a straight track and on a curved track, use the wheel vertical rise and the wheel-rail contact point as the evaluation criterions for derailment. The influence of train running speed, wheel-rail friction coefficient, vehicle load, track geometric irregularity, partly load, gauge and the shape of wheel tread on derailment was emphasized. Especially compared the anti-derailment capability of C& freight car with three-piece bogie with C&AA freight car with ZHUAN-8AG bogie by computer simulation, the results indicate that the bogie with cross-linked knighthead and double-action elastically roller is much better than the three-piece bogie on derailment prevention.With the help of the above theoretical analysis and the derailment simulation results, considering the present actual railway transportation, at the end of the paper, the plans how to prevent the vehicle derailment was introduced.