Research On Urban Road Traffic Network Failure Model For Node Importance Evaluation

With the rapid growth of motor vehicles in the city,urban traffic problems become increasingly severe.The urban traffic system is large and complex,the scholars found that urban road traffic network has obvious characteristics of complex network,in order to alleviate the traffic congestion problem,some scholars have begun to study how to apply the knowledge of complex networks to urban road traffic.Based on the complex network theory,this paper establishes a model of urban road traffic network,a dynamic failure model based on SIS is proposed,the node importance evaluation method of road network considering dynamic failure is designed,with the example of Beijing urban road traffic network,the statistical characteristics of the road network and the change of its important statistical characteristics under the condition of static failure are analyzed,through the experimental simulation of the dynamic failure model of the road network,this paper analyzes the dynamic evolution process of the traffic network congestion,and the node importance of road network considering dynamic failure is analyzed.In this paper,first,three network models of urban road traffic network are constructed,the static evaluation method for node importance of road network is discussed.Then,according to the characteristics of traffic network and the principle of epidemic model,a dynamic failure model based on SI and a dynamic failure model based on SIS are established,through comparison and analysis of them that,in a long time span,the dynamic failure model based on SIS is more reasonable than the dynamic failure model based on SI.Secondly,on the basis of the dynamic failure model based on SIS,combined with the static evaluation method of the node importance of road network,a method for node importance evaluation of road network considering dynamic failure is proposed,that is the method of dynamic evaluation of road network node importance,through the comparison and analysis of the static evaluation method and the dynamic evaluation method,the rationality of the dynamic evaluation method of the node importance is proved.Thirdly,three network models of Beijing urban road traffic network are constructed,the experimental results show that the abstract network has the characteristics of the random network,and the infrastructure network and the dynamic traffic flow network have the characteristics of scale-free networks.The important statistical characteristics of the three networks under different failure modes are analyzed by experiments,the results show that the infrastructure network and the dynamic traffic flow network with the weight of travel time have high robustness under the condition of stochastic failure,and have high vulnerability under the condition of intentional failure.Finally,the road network congestion coefficient under the condition of dynamic failure is analyzed,the results show that under the condition of intentional failure,the network congestion speed is faster than the random failure condition,and the congestion size is larger.Through the analysis of road network congestion coefficient under the condition of different influence coefficient,the results show that the coupling strength between nodes has an important influence on the congestion propagation,the node importance of Beijing urban road traffic network considering dynamic failure is evaluated by simulation.