Study On Vulnerability Assessment Of Urban Rail Transit System

Metro system plays an important role in the urban public transport system.It is convenient,comfortable and high-speed features that attract a large number of passengers.Once there is a problem in metro operation,it will cause personnel detention,delay of some metro vehicles,and seriously paralyze the information network and communication system of the entire urban rail network,causing serious economic losses and people.Therefore,it is necessary to strengthen the safety management of subway system.Metro station system,metro vehicle system and civil engineering and external environment system are three important subsystems of metro system,which play a decisive role in the safe operation of metro system.Therefore,it is necessary to strengthen the safety management measures of metro system.From the perspective of vulnerability research,this paper analyzes the vulnerability factors of subway station system,subway vehicle system,civil engineering and external environment system,and puts forward suggestions to reduce the vulnerability of the system.In this paper,the vulnerability evaluation of subway station system is carried out,the vulnerability evaluation index system of subway station system is determined,and the vulnerability evaluation model of subway station system based on Petri net is proposed.According to the working process of each subsystem,the vulnerability evaluation index of each subsystem is analyzed and determined.The vulnerability evaluation model of each subsystem is constructed by the determined vulnerability evaluation index,and the vulnerability evaluation model of subway station system is integrated by considering the correlation principle between subsystems.Through the influence way of vulnerability influencing factors on the system vulnerability level,the calculation method of vulnerability level is determined.Finally,the specific case is analyzed,and the influencing factors of vulnerability of subway station system are obtained.In this paper,the vulnerability evaluation model of metro vehicle system is built based on Petri net.Firstly,the vulnerability evaluation model is established according to the relationship between each subsystem and the influence of the vulnerability factors of each subsystem on the train operation.Then,the vulnerability level is calculated by the established model according to the vulnerability evaluation method given in this paper.Finally,the vulnerability of the subway train system and its subsystem is obtained and analyzed.The above method is used to evaluate the vulnerability of specific cases,and the influence of vulnerability factors on vehicle system is analyzed.Based on the evaluation of civil engineering and external environment system,the vulnerability evaluation index system of civil engineering and external environment system is constructed by analyzing the subsystem and the vulnerability impact index of each subsystem on civil engineering and external environment system.According to the determined vulnerability evaluation index system,the vulnerability evaluation model based on Petri net is established,and the calculation method is determined according to the influence mode of vulnerability factors on the system,based on which the vulnerability water of the system is evaluated.And through a specific case analysis of vulnerability factors on the civil and external environment.