Combined Optimization Of Urban Rail Transit Train Formation And Real-time Control In Integrated Transportation Hub

In addition to meeting the demand within the urban areas along the rail transit,the urban rail transit connecting the integrated transportation hubs must also consider the demand by other modes of transportation from the hub.The demand within the cities along the route fluctuates throughout the day,and the demand from the other modes of the hub shows short-term and high-intensity characteristics.In addition,delays in the arrival of other modes of transportation in the hub will cause fluctuations in this part of the demand.The demand for urban rail transit connecting to integrated transportation hubs has time-invariance.This paper deals with the complex characteristics of demand from two aspects:train formation optimization and real-time control.Firstly,comprehensively consider the demand along the rail transit and other transportation modes at the hub station,respond to the fluctuation of demand in different time periods through the multi-group operation of the train,and establish the model to optimize the number of train formation by minimize the amount of spare space when the train leaves the station.Then,for the multi-group running train,the real-time control of the train should cope with the impact of delays in the arrival of other modes of transportation of the hub,and optimize the control duration of the train at the stations with the shortest waiting time of the passengers.In this paper,the solution method of the model is designed based on genetic algorithm,and the results of the optimization model in the case of considering the arrival delay of other modes of transportation at the hub or not are calculated respectively.The number of train formation and their timetables under the multi-group operation conditions and the real-time control duration of the running trains at the stations are obtained.Through the analysis of the results,it is found that compared with other operational strategies in this paper,the multi-group operation of the train combined with the real time control can better meet the demand changes of the urban rail transit,effectively reduce the station strands under the high-intensity arrival of the passenger flow at the hub,also can reduce the average passenger time without increasing the passenger's on-board time;whether or not to consider the arrival delay of other modes of transportation at the hub station,the optimization of the train formation can reduce the average waiting time of the passengers and make the waiting time of the passengers entering the station at different times more balanced;considering the delay of arrival of other modes of transportation at the hub station,the station control of the running train can reduce the peak of passenger waiting time.