Study On The Vulnerability Of Urban Rail Network Nodes

As an important part of urban transportation,the research on the vulnerability of urban rail transit is a hot research field in recent years.At present,most of the studies on the vulnerability of urban rail transit are from a single point of view to analyze the vulnerability,and the cut-in perspective is generally the urban rail network structure or the urban rail transit operation status,and there is a relative lack of comprehensive evaluation research.As the basic unit of the urban orbit system,the urban orbit network node plays an important role in the urban orbit system.Therefore,it is of theoretical and practical significance to study the vulnerability of the urban orbit network node.This thesis first analyzes the related concepts of vulnerability,summarizes the definition of vulnerability in various research results,and defines the vulnerability of the nodes in urban rail transit networks.Then,from the aspects of static network structure and dynamic rail transit operation,the vulnerability of urban rail network nodes is analyzed,the identification parameters are constructed on the basis of static features and dynamic characteristics,the vulnerability source filters are selected for urban rail network nodes,and the static vulnerability assessment indicators and dynamic vulnerability assessment indicators is established.From the in-depth analysis of traffic supply and demand,the relationship between static vulnerability and dynamic vulnerability is elaborated,the connotation of comprehensive vulnerability is elaborated,and an evaluation model of comprehensive vulnerability is constructed.Finally,the principal component analysis method is used to quantitatively analyze the vulnerability of urban rail network nodes.Through the case analysis of different rail traffic demands,the scientific rationality of the comprehensive assessment model was verified,and the vulnerability assessment was carried out by combining the urban rail network structure and the rail transit operation status.From the three levels of evaluation indicators,static and dynamic vulnerability,and comprehensive vulnerability,the vulnerability of urban rail network nodes is analyzed,providing a reference for urban orbit planning,construction,and management.