Research On Theory And Calculation Method Of Subway Dynamic Congestion Index

With the rapid increase in the share of urban rail transit,the contradiction between subway transportation capacity and demand,the passenger crowding limit of stations,congestion of transfers in the stations,and the high full load rate of trains,etc.,resulting in a reduction in passenger service levels and an increase in the risk of operational accidents.Therefore,how to objectively and dynamically reflect the congestion in the station,section and any area of network is of great significance to the safe operation and management of the subway and guiding passengers to choose travel.Based on this understanding,this paper proposes a theory and calculation method for describing the crowd congestion degree of subway stations,line sections,line networks and their designated areas using the subway dynamic congestion index.The specific research contents are as follows:(1)The basic theory of subway dynamic congestion index is studied from three aspects: congestion evaluation unit division,congestion influencing factor analysis,and congestion degree classification.The subway congestion evaluation unit is divided into the main pedestrian facilities(gates,passages,escalators and platforms,etc.),station units,line sections,line networks and their designated areas in the station.Among them,the main pedestrian facility congestion in the station describes the local congestion of the station,The station unit congestion describes the station congestion from an overall perspective,on this basis,the congestion influencing factors of each evaluation unit are analyzed,and the congestion degree of the main pedestrian facilities in the station is divided into six levels based on passenger service level,considering passengers After the service level and public safety factors,the congestion degree of the station unit,line section,line network and its designated area is divided into four levels.(2)The research proposes a dynamic congestion finger calculation model for pedestrian facilities and station units in the station.The passenger flow density is selected as the congestion evaluation index of the main pedestrian facilities,and the threshold value of the dynamic congestion index corresponding to each congestion level is calibrated;The thresholds of the dynamic congestion index of the station units corresponding to the congestion level are 0-1.66,1.66-2.62,2.62-4.35,4.35-10.00.(3)The study proposes a calculation model for the dynamic congestion index of subway lines.The average train full load rate is selected as the congestion evaluation index for the upstream and downstream sections,and the thresholds of the dynamic congestion index corresponding to each congestion level in the line section are analyzed and found to be 0-5.00,5.00-6.43,6.43-7.86,7.86-10.00.(4)The research proposes a calculation model of the dynamic congestion index of the designated area in the subway network.Take the comprehensive congestion degree of stations and sections as the regional congestion evaluation index.Method for calibrating the threshold of dynamic crowding index of a region.(5)Based on the amplitude of data fluctuations,a method for calculating the time granularity of the dynamic crowding index acquisition during peak and peak periods is proposed,and the effectiveness of the method is verified by an example.