A Research On Urban Freight Network Evolution Based On Improved BA Model

With the development of economy and the advent of the Internet era,the scale of urban freight demand continues to expand,and the timeliness,cost,and safety of freight transportation have also received more attention.This paper uses the complex network theory,combined with the characteristics of the urban freight network to improve the original BA model,proposes an urban freight network evolution model,and conducts theoretical analysis and example verification to reveal the impact of the logistics node type,location,network weight,etc.during the evolution of the freight network on the nature of the network,provides a theoretical basis for the optimization of the urban freight network.First,this article briefly introduces the basic theories of complex networks and urban freight networks,and analyzes the similarities and differences between urban freight networks and complex networks from the perspectives of nodes,connection edges,and preference connections between nodes,and provides theoretical basis for the up-coming BA model improvement.Then this paper analyzes the time background,evolution mechanism and its limitations and improvement ideas proposed by the BA model.By comparing the dynamic evolution process of the urban freight network and its core mechanism(growth and preference connection),the distance between nodes,freight volume,and The degree of influence of attractiveness and connection rate between nodes on the establishment of connections between nodes is integrated into the formula of the probability of connection preference,which provides a mathematical basis for the model evolution in the subsequent chapters.Finally,obtain the logistics node information of Wuhan City,use Matlab programming language to simulate the generation of nodes and edges,combine Gephi,Arcgis and Adobe XD to visualize the evolution process in stages in a visual way,and comprehensively analyze the evolution process and evolution results,and point out the freight network The optimization direction is to provide optimization strategies from the three aspects of freight stations and freight networks,freight volume redistribution,and collaboration between freight stations,to provide theoretical guidance for future freight planning.