Research On Dependability Evaluation Of Urban Rail Train System Under The Influence Of Fault

As the core carrier of urban rail transit system,the dependability of urban rail train system in the course of operation directly affects the safe and reliable operation of the urban rail transit system,especially under the influence of failure.Therefore,this paper takes the urban rail train system as the research object,and conducts research on the evaluation method of the dependability of the urban rail train system under the influence of the fault.The main contents are as follow:(1)The connotation and attributes analysis of urban rail train system dependabilityOn the basis of the analysis and summary of the theoretical research status,combined with the composition and characteristics of urban rail transit system,the dependability of urban rail train system is defined as the level to which the system meets the requirements of safe and reliable service performance under operating conditions System reliability and safety are the main attributes of system dependability.(2)Research on the construction method of urban rail train system topological network modelBased on the composition and structural characteristics of urban rail train system,combining components and the connection between components,this paper proposes the method of constructing the topological network model of urban rail train system.Based on the structural investigation and expert discussion of urban rail B-type train,the topological network model of urban rail B-type train system with 140 nodes and 270 edges is constructed by using the method of constructing the topological network model of the system.(3)Study on functional cluster division method of urban rail train system based on topological networkIn view of the defects of the traditional cluster method for urban rail system components,the concept of functional cluster is proposed.Based on the topological network model of urban rail train system,considering the functional properties of nodes and connection edges,and based on the detection method of community structure,a functional cluster partition method of urban rail train system is proposed.(4)Study on fault propagation model of urban rail train system based on function clusterOn the basis of dividing the network of functional cluster structure,based on the operation history fault data,the fault propagation threshold is introduced,the repair ability of the node,the type of the node,the failure rate of the node,the loss in the transmission process and other factors are comprehensively considered,and a system fault propagation model suitable for the urban rail train system is proposed in combination with the disaster propagation dynamics model.(5)Research on the dependability attributes of urban rail train system based on fault propagationBased on the results of system fault propagation and global efficiency reliability,the efficiency reliability measure of function cluster is proposed.Considering the possible failure consequences of function cluster,the safety measure of functional clusters is proposed.On this basis,combined with the structural importance of functional cluster,the calculation method of system reliability and safety is proposed.Combined with the system dependability attributes(system reliability and safety),the system dependability evaluation method based on the combination weighting method is formed.Finally,taking urban rail B-type train as an example,the system function cluster division method,system fault propagation model and system dependability evaluation method proposed in this paper are applied as examples.The results show that this method can be applied to the dependability evaluation of urban rail train system,which provides reference for the dependability research of urban rail transit system.