Vulnerability Of Xi'an Metro Network Under External Shock

In recent years,subway network has become an important part of urban public transportation with many advantages,such as high operating efficiency,running on time,running safety,environmental protection and so on.It has also become the most important part of urban construction and daily operation.Due to the continuous expansion of the metro network scale and the large increase of carrying passenger flow,the security problems during the urban subway network operation are facing new challenges,such as natural disasters,equipment failures and terrorist attacks,such as natural disasters,equipment failures and terrorist attacks,which not only destroy the structure of road network and reduce the connectivity of road network.Sex may also seriously affect the service level of urban rail transit and inconvenience the residents' travel.In order to ensure the efficient and safe operation of the subway network and improve the anti impact ability of the subway network,the managers must know that the whole network faces the vulnerability level of sudden events or deliberate attacks.It is of great theoretical and practical significance to prevent the emergence of the vulnerability of the subway network.On the basis of the above considerations,on the basis of systematically combing the relevant literature and cases,taking the Xi'an subway network as the research background,using the complex network basic theory and the subway network vulnerability assessment method,the vulnerability of Xi'an urban subway network under the external impact is analyzed.The paper first proposes the three time mobile average method to predict the total passenger volume of Xi'an Metro Network 2020,1,2 and 3.Secondly,the problem of operation of Xi'an Metro is analyzed by factor analysis.Thirdly,the basic attributes of Xi'an subway network are analyzed,and the Xi'an subway network is a random network.11 external impact factors are selected by the bibliometric method,and the most important external impact factors of the vulnerability of the subway network are determined by the DEMATEL method.Then,the main external impact factors that affect the vulnerability of the subway network are the harsh climate constraints,the link capacity constraints and the capacity constraints,and the Xi'an subway network vulnerability measurement model is established.Finally,taking the Xi'an subway network as the empirical research object,with the help of the MATLAB simulation software,the changes of the relative service efficiency of the Xi'an subway network under the influence of the different attack modes in the normal state and th e bad climate are compared and analyzed.The simulation results show that the importance of the site changes with the failure of the other sites in the network;the vulnerability of the site is not directly related to the size of the degree,but is influenced by its geographical location,the number of passengers and the transfer of passengers,and the Xi'an subway network is in normal condition or evil.Under the influence of bad climate,the importance attack is more vulnerable,but under severe climate conditions,the Xi'an metro network shows higher vulnerability.Finally,the paper puts forward the countermeasures to reduce the vulnerability of Xi'an metro network.Therefore,in the design period,construction period and operation period of the subway network,we should not only strengthen the key sites under the initial state protection,but also predict the key sites in the network which have been changed after the impact,and avoid the rapid deterioration of the relative service efficiency of the network after the accident.