Calculation Of Carrying Capacity Of Urban Rail Transit Station And Optimization Of Passenger Flow Organization

With the development of urbanization,passenger demand is increasing,and the scale of rail transit network is expanding.As the passenger flow exchange hub of urban public transport system,subway transfer station shows serious passenger flow congestion when the demand of morning and evening peak passenger travel increases.The underground semi enclosed space limits the free movement of passengers,and the traffic speed is very poor when the passenger density increases,which not only consumes the time cost of passengers,but also greatly challenges the passenger carrying capacity of the station,and there are security risks.In view of the above analysis,this paper proposes a reasonable,effective and implementable passenger flow organization optimization scheme to alleviate the peak passenger flow congestion of subway transfer stations.Firstly,this paper summarizes the domestic and foreign scholars’ research methods on passenger flow carrying capacity of rail transit station,pedestrian flow movement characteristics and passenger flow control of station,and determines the technical route of this paper;This paper uses MATLAB to preprocess the passenger flow data of AFC system,analyzes the change law of passenger flow and time,analyzes the influencing factors of passenger flow combined with the station operation organization streamline,and uses MATLAB software to fit the "rate density" curve of passenger flow.Secondly,the concept of carrying capacity of station passenger flow system is defined,and the influence on the carrying capacity of station is analyzed from three aspects of operation organization,internal environment of station and traffic equipment and facilities;Based on the theory of system dynamics,this paper analyzes the elements of the passenger flow organization system and their feedback relationship,draws the causal loop diagram,establishes the passenger flow organization system model of rail transit transfer station according to the output logic structure,compiles the system equation,calculates the instantaneous passenger flow of each area,determines the simulation process and variable equation,and simulates with Vensim software.Ultimately,taking Xi’an Road transfer station in Dalian as a case study,combined with the investigation data and the status quo of Xi’an Road station structure,the passenger flow organization system model of Xi’an Road transfer station is established,Vensim software is used to simulate the accumulation of passenger flow in the station hall,platform and other areas during the morning and evening rush hours.According to the passenger flow change law reflected by the results,a variety of methods are proposed to alleviate the congestion of morning and evening peak passenger flow,such as shortening the departure interval,adjusting the passing rate of security check passenger flow,and changing the flow line,By changing the parameters and comparing the passenger flow differences before and after optimization with Vensim software operation model,it is found that the implementation of the scheme can effectively reduce the peak regional passenger flow per unit time,stabilize the passenger flow fluctuation,alleviate the impact of commuter peak passenger flow on rail transit transfer station,reduce the passenger flow density in the station during peak hours,and achieve the purpose of improving morning and evening peak passenger flow congestion,The efficiency of transfer is improved.