Research On Network-Based Passenger Flow Simulation Of Urban Rail Transit

At present,urban rail transit is facing a rapid growth,the process of network formation is increasily accelerated in various cities.Under the background of network,many elements need to be considered during the timetable formulation.Right now,there is no relatively concise and intuitive method which could solve this problem.In this paper,A network simulation platform is established,using it to coordinate timetable.Analyzed the key factors,put forward a new method to coordinate network timetable.Firstly,systematically sortes out the key factors in the simulation process of urban rail transit network combined with the existing research.Including the characteristics of network passenger flow,network timetable,transfer mode,train and station fixed facilities.In the analysis of network passenger flow characteristics,combined with the actual passenger ticket data of Chengdu Metro network,this paper starts from four aspects: time characteristics,space characteristics and passenger flow characteristics,path selection characteristics.In the process of timetable analysis,using Anylogic simulation model to study the influence of train interval and arrival time of the first train.At the same time,study the layout of transfer stations and the rules of transfer travel time.Finally,analyzes the train capacity and the layout of station facilities and equipment.Secondly,in order to scientifically analyze the simulation schemes of different timetables.considering the difference between the traditional evaluation,this paper put forward an evaluation theory based on network simulation.Selecting platform area density,passenger waiting time,total number of boarding people as timetable coordination evaluation index.And establishes a comprehensive evaluation method based on entropy weight method and weighted average method.Thirdly,focusing on the details of the construction of network simulation platform.Firstly,deeply analyze the Anylogic simulation software and the algorithm of social force model.On this basis,the whole modeling process is divided into five steps: station environment modeling,pedestrian modeling,train modeling,agent modeling and statistical modeling.This paper focuses on the analysis of the related functions of secondary development modeling in agent modeling,establishes a generalized cost model for passengers to the escalator and waiting area,encapsulates the self-designed security inspection and selecting escalator module through Java programming,and designs the function of passenger waiting area selection.The key problems of establishing network multi-station model are analyzed,and the joint simulation of traditional single-station model is realized by controlling passengers to get on and off through network timetable setting.Finally,based on the proposed modeling method,the simulation platform of Chengdu Metro Network is constructed by selecting three transfer stations of Luomashi,Tianfu Square and Chengdu University of TCM & Sichuan Provincial People's Hospital,and fits transfer travel time by MATLAB software.After modeling,the simulation results are compared with the actual situation to verify the effectiveness of the simulation.In order to coordinate the timetable,36 alternative schedules are constructed according to the current timetable of Chengdu Metro and evaluate the coordination of network timetable.The simulation results show that the timetable-makers need to focus on the platform density index,followed by waiting time.The impact of the total number of waiting is not obvious.In the process of formulating the timetable,it is necessary to meet the coordination of large passenger flow transfer first,and then adjust the train interval.For Chengdu Metro Network,the interval between Line 2 can be shortened and the interval between Line 4 can be increased.