Analysis And Modeling Of National Expressway Network Structure Based On Complex Network

The theory of complex networks is described,analyzed,commonly used optimization methods of complex system.Many scholars use the theory of complex networks of city bus network,subway network of aviation network,construct the network model,analyzing the network structure,a method of network optimization.On the basis of previous research,this paper use complex network related theory,to the national highway network as the research object,discusses the theory and practice.In this paper,the theory of complex network is used to research the national freeway network.The main research contents include the current,highway and provincial cities as nodes,three complex network models of L,R,P space are constructed,and the static topology model of complex network from degree,degree distribution,closeness centrality and betweenness centrality,link density,clustering coefficient and economic the average path length of seven aspects of the analysis,found that the network has small world of diameter,characteristic of short,these features can reflect the current problems existing in the national highway network construction;Data on the construction and traffic of China's highways were collected and compiled from 1984 to 2016,the data cycle for five years,to show the dynamic evolution the process of the national highway complex network,highway network has found selection mechanism and self growth mechanism,on the basis of the construction of the national highway network evolution model,and the model from four aspects,the degree distribution,average path length and clustering coefficient of the computer simulation,to verify the accuracy of the model;combined with the above two main research results,the countermeasures and suggestions for improving and optimizing the future construction of expressway network are put forward.In this paper,the complex network theory is used to research the national expressway network data.It is concluded that the moderate distribution of the expressway in the P space is exponentially distributed with large clustering coefficient and smaller average path length,indicating that it has a typical small The spatial distribution of R space shows that the national expressway network has a small average path length and a small clustering coefficient.The whole network embodies the scale-free characteristic and belongs to the scaleless network.The simulation model of the national expressway network evolution model,The model can be used to predict the development of the national expressway network.Although the highway network construction in China has made remarkable achievements,there are still some problems such as poor connectivity and duplicate construction in other cities.The use of complex networks on the national highway network analysis for the future construction of highways to open up new ideas,to provide new ways and new ways to further realize the green road to find a breakthrough.