Research On Train Connection Optimization For Transfer Station Of Urban Rail Transit

In recent years,urban rail transit is developing rapidly,and the road network is more and more showing a network form.The way of operation management and organization has gradually shifted from single line independent operation to multi-line collaborative operation.Networking makes all lines of Urban Rail Transit connect to each other through transfer stations,and the transfer efficiency of the transfer station directly affect the transfer service level of the whole road network.Therefore,it is particularly important to establish a train connecting plan for transfer stations scientifically and reasonably.In this paper,the train connection optimization of transfer station is taken as the research object.First,the transfer mode,the layout of the transfer station,the layout of the line,the factors that affect the transfer connection and the transfer connection goal of the network line are studied.The train connected target of the transfer station is to minimize the total transfer waiting time of passengers by changing the arrival time of the train in the transfer station according to the facilities and equipment performance of the transfer station and the characteristics of the passengers flow.The walking time of passengers in the station and the waiting time in the platform of passengers are analyzed,and the theory of probability and statistics is used to deal with the walking data,and the data are estimated by Matlab.The waiting time in the platform of passengers is analyzed by different classifications of platform,and the influence of the waiting time in the platform of the passengers on the transfer time and the arrival interval of the train is obtained,and the average transfer waiting time can be optimized by adjusting their values.Secondly,the paper studies the train connection of a single transfer station.The selected coordination period is flat peak period.On the basis of considering the transfer mode of non-identical platform and the flow volume of transfer passengers,the optimized model of train connection based on minimizing the waiting time of passengers is established.The corresponding genetic algorithm is designed to solve the model,and the optimized arrival time table of connect train at transfer station is obtained.Based on the research of train connection in single transfer station,the influence relationship between multiple transfer stations of network lines is considered.The coordinated and optimized model of train operation on network is established,and the train connected scheme of multiple transfer stations is optimized.The non-dominated sorting genetic algorithm(NSGA-II)with elitist strategy is designed to solve the model.At the same time,the transfer scheme group is selected according to the passengers flow of different transfer directions,and the train connected scheme of all transfer stations in the road network is coordinated.Finally,taking the North Street Station of Xi'an Metro as an example.The trainconnected plan of transfer station is optimized by using the model built in this paper.The result is solved and analyzed by the designed algorithm.The results show that the optimized schemes of train connection for a single transfer station and multiple transfer stations under the condition of network is obtained by using the model of train connected optimization in the transfer station and the designed algorithm.It has the significance of reference and guidance for reducing passengers transfer waiting time and improving operation efficiency of road network.