Study On The Longitudinal Dynamic Performance Of Long Heavy-haul Train Affected By Parameters Of Combined Slope

At present,the world heavy-haul railway is moving forward in the direction of the big axle and the great traction mass,which will improve the transportation capacity of the railway.However,as the quality of the train's traction increasing,the length of the train is also continued to lengthen,which will increase the transmission time in the long heavy-haul train,and it will cause the line profile of the train route more complicated,which can affect the longitudinal dynamic performance of the train.Therefore,the profile parameters setting of heavy-haul railway is more demanding compared with ordinary railway,and studying on the longitudinal dynamic performance of long heavy-haul train affected by parameters of combined slope has important theoretical value.Based on the long heavy-haul train with 30t axle and 30000t traction mass,the longitudinal dynamic performance of long heavy-haul train affected by parameters of combined slope has been studied by using UM software to build up the heavy-haul train-line longitudinal dynamics model,the main research is as follows:(1)The recent study of the longitudinal dynamics and the profile parameters of the heavy-haul train has been learned by reviewing a large amount of literature,meanwhile the profile parameters setting of heavy-haul railway at home and abroad has been analyzed.(2)According to the longitudinal dynamics theory of the train,the long heavy-haul train-the longitudinal dynamic of railway lines model has been built.(3)For the long heavy-haul train with 30t axle and 30000t traction mass,the parameters of combined slope,such as slope,slope difference,type and radius of the vertical curve and slope length,have been studied and determined reasonably.(4)The longitudinal dynamic performance of long heavy-haul train affected by parameters of one combined slope has been simulated analyzed by using the established simulation model and evaluating based on the train's hook force and longitudinal acceleration,and according to the results of analysis,the influence law of the longitudinal dynamic performance of long heavy-haul train affected by parameters of one combined slope has been summarized to offer a proposal for the profile parameters of one combined slope of heavy-haul railway line.(5)The longitudinal dynamic performance of long heavy-haul train affected by parameters of multiple combined slope has been simulated analyzed by using the established simulation model and evaluating based on the train's hook force and longitudinal acceleration,and according to the results of analysis,the influence law of the longitudinal dynamic performance of long heavy-haul train affected by parameters of multiple combined slope has been summarized to offer a proposal for the profile parameters of multiple combined slope of heavy-haul railway line.