Research On Urban Rail Transit Network Reliability Based On Passenger Flow Weighted

With the rapid development of society and economy,the scale of cities has continued to expand.As the backbone of the urban public transportation system,urban rail transit has gradually become the main carrier for connecting urban spaces.Urban rail transit network construction planning is constantly improved,the network structure is becoming increasingl y complex,and more and more challenges are faced.At the same time,people have raised higher requirements for the safety and reliability of rail transit network transportation services.However,analysis of the reliability of urban rail transit networks based on complex network theory,it has important theoretical and practical significance in identifying the important nodes in the urban rail transit network,the reasonable reconstruction and expansion of the urban rail transit network,and the formulation of an efficient emergency response plan for emergencie s.First,this article briefly describes the basic characterist ics,characteristic parameters and four basic models of complex networks.It also introduces the meaning and calculat io n methods of various characteristic parameters of weighted complex networks and two common models.Based on this,the basic concepts and characteristics of the urban rail transit network are analyzed.Then,taking the Chengdu rail transit network as an example to apply the Space L method to build a geographically-based weightless network and a cross-section passenger flow-based weighted network model and using Matlab software to calculate and analyze the characteristics of complex networks,the basic data of the characteristic parameters of unweighted networks and weighted networks are obtained.Then,based on the node importance theory,the Page Rank algorithm is introduced,and the basic idea and algorithm process of the algorithm are introduced.Then the traditiona l Page Rank algorithm is improved to make it suitable for rail transit networks,and then the improved algorithm is applied to the Chengdu rail transit weighted network model,and the PR values and ranking order of all sites are obtained.Next,according to the definition and influencing factors of urban rail transit network reliability,different reliability evaluation indexes were selected and different attack strategies were designed.Using Matlab software to conduct simulation attack tests,and obtain the changes of various reliability evaluation indicators under different attack strategies.Then,the reliability of Chengdu rail transit network is summarized and analyzed,and related optimization measures are proposed according to the simulation results.Finally,according to the classification of emergencies,the definition of urban rail transit operation interruption is elaborated,and analyzes the start conditions of bus emergency transport after the interruption of rail transit operation and related bus dispatching schemes.A method for evaluating the impact of bus emergency transport on network reliability was proposed,and a specific case analysis was made.