Research Of Vulnerability Of Urban Metro Network Based On Complex Network

Metro network become the focus of the construction of urban public traffic for its advantages of big traffics and high efficiency and transporting on time, especially in the international metropolis. As an important part of urban infrastructure system, urban metro network has extremely important significance for the daily operation and the development of the city. For its rapid development, the safety operation faces new challenges and requirements at the same time. In order to ensure the efficient and safe operation and to improve the ability to resist attacks of metro network, administrators must know the vulnerability level of whole network in the face of emergencies or attacks and find where has the most vulnerable and serious consequences.However, only a few scholars studied the vulnerability of metro network, mostly from the view of topology structure or physic, not taking the change of passenger demand and the passenger travel time delay into account. This will not be able to truly reflect the actual critical stations and edges and the vulnerability of metro network.This article takes metro network as the research object and uses real OD trip matrix.Comprehensively analysis and determine the vulnerable stations and critical links from three directs: the delay time of passengers' traveling, the unsatisfied demand passengers and the service efficiency of network. With the help of MATLAB, the changing of service efficiency of the network is simulated under different attack ways. The results show that the importance of links and stations changed as the broken of other links and stations in the network; the vulnerability of stations and it's degree is not directly related, but influenced by its location, transport passengers and travel alternatives comprehensively;Shanghai metro network under the importance of continuous attack. In order to avoid network service efficiency rapid deterioration after the accident, not only need strengthening the protection of critical links and stations under the initial state, but also predicting the critical links and stations in the changed network after the attacking and protecting them in the design, construction and operation of metro network.