Node Importance Evaluation And Cascading Failure Study Of Urban Traffic Complex Network

As the scale of modern cities continues to expand,the matching urban transport network road network structure is gradually becoming more complex,which in turn leads to the risk of congestion in the road network.The links between transportation network sites are getting closer and closer.If the "key nodes" among them are congested,the fault will be quickly propagated in the network,and the phenomenon of "cascading failure" will occur,causing a wide range of road congestion and affecting the entire urban traffic network.Therefore,in the study of urban transportation networks,it is very important to study the evolution law of "cascading failure" of transportation networks.Based on the complex network theory,this paper studies the topology and complex network possessed by the urban transportation network,and simulates the cascading failure evolution law when the urban road network is attacked.The main work of this paper is as follows:1.With the application of complex network theory,this paper abstracted the urban road network into a complex network.The static topological characteristics of the traffic network and the complex weighted network topological characteristics loaded with dynamic traffic flow are studied.The evaluation method of the importance of traffic network nodes is proposed.2.Based on the analysis of urban traffic network system dynamics,this paper fully described the cascading failure theory and related research model.Combined with the complex characteristics of urban traffic network,this paper applys the Coupled Map Lattices(CML)model to the analysis of cascading failure process,and proposes an CML based algorithm for estimating the impact range of road traffic network failures.3.Taking the urban traffic network of Nanguan district,changchun city as an example,this paper construct the network topology diagram of this region according to the Space L method,and analyzetheimportance of each node.A cascading failure model based on CML is presented to simulate the cascading failure process of the traffic network when the high-importance and low-importance nodes are attacked.4.Combined with the traffic basic condition and the existing road congestion control measures of changchun city,this paper proposes the road node(especially the roundabout)congestion control strategy that conforms to the law of cascading failure evolution.focuses on the study of the roundabout congestion control strategy,which provides a practical method reference for traffic control.