Analysis of high-speed train curve negotiation performance and research on factors affecting derailment
Train derailment accidents often occur due to track irregularity or the operation status.As trains operate in a formation,it is crucial to select the evaluation objects for derailment of marshalling train and conduct an analysis of influencing factors based on this selection.A marshalling train dynamics simulation model was established in SIMPACK,and a numerical simulation analysis method was used to select the evaluation objects for typical operation statuses of an 8-grouped train under different evaluation systems based on two evaluation indices,which are derailment coefficient and wheel load reduction rate.The changes in the patterns of five derailment influencing factors were compared,including track irregularity,rail cant,operation velocity,curve radius,and curve superelevation.The influencing factors were uniformly sampled using a full factorial sampling method,and Sobol global sensitivity analysis was applied to weight the factors affecting train derailment.The research results are showed as follows.In marshalling trains,the same position derailment coefficient of the first vehicle is the highest among all other vehicles under 26 different operating conditions.The cases where the wheel load reduction rate of the front wheelset in the front bogie of the first vehicle and the derailment coefficient of its inner wheel in a curved section are the largest accounted for 85%and 81%,respectively.The above evaluation indices can be used as target factors for analyzing the derailment influencing factors of marshalling trains.The impact of track irregularity and rail cant on the derailment of high-speed trains is relatively small,and their change trends are close to linear.The operation velocity has the greatest impact on the safety of high-speed train operations,followed by curve radius,and then curve superelevation.The operation velocity has a relatively significant impact on the operation of trains,and is most likely to cause derailment accidents when trains pass through curves.This should be given greater attention in practical operation.
marshalling trainderailment factorsobject evaluationsobol global sensitivity analysisrailway safety
万方数据
维普
