| With the continuous development of my country’s urbanization process,the urban public transportation system with the subway-bus composite network as the main body has become a key urban infrastructure to alleviate traffic congestion and enhance the city’s comprehensive transportation capacity,playing an important role in densely populated large and medium-sized cities.The efficient and reliable operation of the subway-bus composite network is an important guarantee for improving the efficiency of urban public transportation.However,the coupling and relevance of the subway-bus composite network makes emergencies have a great impact on the safety and efficiency of transportation.Therefore,studying the robustness of the subwaybus composite network is of great significance to guide line network planning,line station layout,and operation management.This paper adopts complex network theory to establish a subway-transit composite network model,analyzes the impact of topology and functional characteristics on the robustness of the subway-transit composite network,studies important station identification methods,and proposes effective network repair strategies to improve the subway-bus network.The reliability of the composite network.The specific research content is as follows:Firstly,establish a subway-bus composite network model based on a complex network.The Space L method is used to establish the subway network and the public transportation network,analyze the correlation characteristics of the subway network and the public transportation network,and combine the complex network theory to establish a subway-transit composite network model.Taking the urban area of Chengdu as an example,a model of Chengdu metro-transport composite network was constructed,and the complexity and robustness of the network were simulated and analyzed.It showed that the metro-transit composite network had the characteristics of scale-free and small world,and the composite network had excellent robustness to the subway and bus network.Secondly,a key station identification algorithm based on the greedy betweenness of the subway-bus composite network is proposed.In order to mine the key stations in the subwaybus composite network and improve the robustness of the network,a key station identification algorithm based on the greedy betweenness of the subway-bus composite network is proposed.On the basis of the betweenness centrality algorithm,the greedy algorithm is introduced to calculate The importance of stations under the dynamic changes of the network structure expands the influence of key stations.Simulation analysis shows that the greedy betweenness strategy attack has the greatest impact on network performance,indicating that the algorithm has high key station recognition accuracy.Finally,a repair strategy for the subway-bus composite network based on elastic evaluation is proposed.In order to improve the efficiency of node failure recovery of the subway-bus composite network and improve the robustness of the network.A repair strategy for the subway-bus composite network based on elastic evaluation is proposed.On the basis of the conventional repair plan,combined with greedy thinking,the candidate repair plan is elastically evaluated by using the objective function(minimizing the flexibility of the subwaybus composite network as the goal).After traversing all the repair plans,the optimal repair plan is determined.Simulation analysis shows that the subway-bus composite network repair strategy based on elastic evaluation has a higher repair rate and can effectively reduce the performance loss of the subway-bus composite network. |
