Urban Road Traffic Network Pinning Control Method Research

With the development of the economy,motor vehicles have become an indispensable important item in people's daily life.Every household welcomes the arrival of automobiles.However,although the soaring sales of automobiles have driven the economic development,with the continuous expansion of the total number of vehicles,the road began to appear insufficient.In order to cope with the imbalance between supply and demand in this road space,many transportation scholars have made outstanding contributions to traffic management and control,effectively improving traffic efficiency.However,with the continuous expansion of urban road networks,the links between urban roads are becoming more complex,and urban traffic problems need to be given more attention on network.The coupling relationship of traffic network presents the characteristics of complex networks.Applying the theory of complex networks to study urban road traffic networks has become a direction for scholars to explore.In the study of traffic congestion,it is extremely important to stabilize the traffic state of the traffic network and suppress the spread of traffic congestion.Based on the existing research results,this paper studies the signal control of urban road traffic network by using complex network pinning control theory.The main research contents and results are as follows:Firstly,a comprehensive summary of complex network pinning control and urban road network control is given.The basic knowledge,theoretical model and algorithm research of complex network pinning control theory and urban road network control are summarized for the foundation of this paper work.Secondly,the traffic and the betweenness are selected as the evaluation index system of gray correlation degree.The gray correlation degree algorithm is used to correlate traffic and betweenness,and the correlation degree between the two is obtained.The correlation degree is substituted as the key parameters of the iterative resource allocation below.In combination with the urban road network and node attribute values,the node resources are allocated,and node that has the largest resource allocation value is the key node.The simulation road network is established and the experimental verification is carried out.The results show that the iterative resource allocation algorithm under the comprehensive index system can effectively find the key nodes of the urban road traffic network.Provide a theoretical basis for the selection of control nodes in the pinning control strategy below.Finally,the coupling relationship between urban road network segments is ed as a complex network.Considering the traffic control of the road segment is controlled near the expected balance value,a pinning control strategy is proposed to control the control target with key intersections.That is to establish the state equation of the discrete time coupling network with the road segment as the unit,construct the controller,and explore the relationship between the controller and the green time of the key intersection.According to the stability theorem of the control stability,the stability convergence of controlled system is analyzed,the stability condition of pinning control of urban road traffic network is given.The results show that when the stability condition is satisfied,the strategy can control the urban road traffic network in a stable state.Vissim is used to simulate the operation of urban road traffic network without control.The comparison results show that the traffic flow of each section of the urban road network is closer to the expected value under the strategy of pinning control.