| Regional rail transit is the backbone of passenger flow transportation in urban agglomerations.With the rapid development of urban agglomerations,the degree of communication and interaction between cities is increasing,which puts forward higher requirements for regional rail transit service capabilities and levels.Due to the differences in the service scope,technical level,management and operation of the various modes of regional rail transit,the connection between the different modes is not smooth.From the perspective of transportation organization,strengthening the connection between lines and networks and promoting the integrated development of multi-mode rail transit is not only a response to relevant national policies,but also a reflection of actual transportation needs.On the basis of the existing research,this paper takes the multi-mode regional rail transit synergetic operation as the research background,analyzes the characteristics of the urban rail transit networks,distinguish the characteristics of passenger flow between singlemode transfer stations and multi-mode transfer stations,and constructs the urban rail transit multi-station transfer synchronization.The model is optimized,and the effectiveness of the model is verified by an example.The specific content includes the following four points:(1)Based on the statistical characteristics of urban rail transit topology network,node strength and weighted betweenness are proposed as the statistical indicators of urban rail transit operation network characteristics,and they are used as the basis for identifying key stations.Passenger flow factors are introduced,and an actual rail transit operation network based on passenger flow weighting is constructed.Taking Chengdu metro network as an example,the topological structure characteristics and passenger flow weighted network characteristics are analyzed respectively.The results show that: 1)Both Chengdu metro topology network and operation network are scale-free networks;2)The average path length of the topology network is 13.147,the average clustering coefficient is 0;3)The introduction of passenger flow has changed the station betweenness,the weighted betweenness is generally higher than the unweighted betweenness.The stations with low unweighted betweenness make a progress on the weighted betweenness by the affection of passenger flow.Stations with a high unweighted betweenness attract more passengers,and the network exhibits a Matthew effect;4)The key stations in the operation network are the transfer stations.(2)The basic theoretical construction of multi-station transfer synchronization.This paper expounds the meaning of synergy,analyzes the influencing factors of transfer efficiency,analyzes the characteristics of transfer passenger flow between single-mode transfer stations and multi-mode transfer stations,and proposes that the optimization of multi-station transfer synchronization should take into account the needs of multi-mode transfer,and consider the difference of transfer stations in demand.And put forward the goal of urban rail transit transfer synchronization.(3)An optimization model of urban rail transit multi-station transfer synchronization is established.Taking the evacuation effect of urban rail transit on the arrival passenger flow of trunk railways and the transfer connection of various lines within the urban rail transit as the research objects,the method for determining the transfer waiting time in the single-mode transfer station and multi-mode transfer is discussed.During the off-peak period,considering the constraints such as the transfer connection relationship,train arrival and departure time,and research period,and aiming to minimize the total transfer waiting time of the network.The first train departure time of each transfer station and line in each direction during the research period is the decision variable.The weighted betweenness is used to reflect the difference in transfer demand of each transfer station,and as the weight of each transfer station,a multi-station transfer synchronization optimization model of urban rail transit is constructed to realize the synergetic optimization of multi-station and multi-mode transfer passenger flow in the network.(4)Taking Chengdu metro network as the research object,considering the arrival passenger flow of trunk railways in Chengdu East Railway Station and South Railway Station and the transfer connection of various lines within the Chengdu metro network,the multi-station transfer synchronization optimization model of urban rail transit proposed in this paper is applied.And design a genetic algorithm to solve it.The results show that the total transfer waiting time of the network is reduced by 13.26% after optimization,and the larger the weighted betweenness is,the greater the optimization of the waiting time of passengers at the transfer station. |
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