Simulation Study On Throat Zone Passing Capacity Of Large Railway Passenger Station Based Upon Lagrange Coordinate System

As the pace of railway construction in China has accelerated,the number of passengers sent by railway passenger stations has increased year by year.On the basis of summarizing the previous studies,the article studies and analyzes the large-scale railway passenger station in China.With the increasing speed and density of trains on the railway main line,the technical operation of the passenger station is becoming more and more difficult.The passenger station must ensure the safety of the trains,and make full use of the equipment such as the hairline to maximize the passenger station's capacity to complete the transportation production tasks.Under this circumstance,it is necessary to conduct in-depth research on the capacity of large-scale railway passenger stations.The mutual restriction and influence of the equipment and operation in the throat area of the passenger station is the weakest link of the entire station.Therefore,the capacity to pass through the throat area directly affects the capacity of railway passenger stations.However,there are few simulation models for the capacity of the passenger station to pass through the throat area.On this basis,in the case of a certain train passing through the throat of the passenger station,when the train is connected to the corresponding arrival line by the main line,it is necessary to pass through different number of turns and different track circuit sections.There must be multiple accelerations corresponding to the train.The Lagrange coordinate system can treat any train as a particle point,which is more conducive to the formulation of evolutionary rules in the model and simplifies the complexity of the model.Therefore,this thesis is modeled in the Lagrange coordinate system.According to the variation law of the time plane of the train occupied track circuit section,combined with the characteristics of the throat area operation of the large railway passenger station,the factors affecting the throat zone passing capacity are summarized.The multi-one-dimensional cellular automaton model of the system simulates the time-occupation relationship of the train to the track circuit section of the throat during the pit stop.It can be described the time occupancy characteristics of the train in the throat area accurately.Therefore,the problem of the throat area passing capacity simulation can be transformed into a simulation process of occupying time of the track circuit section of the throat area.In the study of the running characteristics of trains in the throat area of large-scale railway passenger stations,computer simulation methods can be used to show that the computer simulation method can not only accurately display the characteristics of train operation,but also provide guidance for railway operation organization.In this thesis,three types of train speed grades are set,combined with the data of the track circuit section of a large railway passenger station and the occupation time of each track circuit section of the three types of trains,and the parameters in the model are adjusted.The effects of different stopping time,different mixing ratios and different departure intervals on the passing capacity the passenger station throat and the running characteristics of the train are analyzed using the theory of multi-one-dimensional cellular automata model.It is provided a few theoretical proposals by the average delay time of trains,the delay time of single trains and the reasons for the change of throat passing capacity in the simulated data for the related research on the passing capacity of the throat area of large railway passenger stations.