The Invulnerability Study Of Airway Network Based On Accessibility

The rapid development of air transportation puts higher requirements on the airway network.The fault-tolerant rate and anti-strike capability of the airway network are directly related to the orderly operation of the flight.Firstly,establish a network indicator system,build a airway network model based on ArcGIS platform,analyze the structural characteristics of the airway network,and establish a weighted network model based on the traffic of the main segment.Considering the time consuming of aircraft climb,cruise and descent phases,and analyzing the accessibility between airports with time distance as accessibility index.Combining the advantages of aviation network and airway network,and studying the traffic capacity between airports based on the airway structure.The results show that compared with the aviation network,China's airway network has a scale-free feature,and some nodes play a leading role in network connectivity.Then,a new algorithm based on improved navigation accessibility is proposed to identify the key nodes in the airway network.The basic idea of algorithm is to calculate how much extra time cost for the flight to fly when a node fails.In other words,how much time saved for the connection between airports because of the existence of the node.Explaining its recognition principle,constructing the evaluation index and giving the identification flow chart.Calculating the weighted change time with the flow ratio as the weight,and exploring its correlation with the network index.Comparing with network index,this identification method can better reflect the influence of nodes on the air accessibility between cities.Finally,the time distance and flow weight between airports are introduced to improve the network efficiency index.The indicator and the maximum connected subgraph are used as the network invulnerability evaluation indicators to simulate the network performance change of single airway point failure,degree-based continuous failure,betweenness-based continuous failure,strength-based continuous failure,and continuous failure based on weighted change time.Identifying the congestion nodes generated by the redistribution of network traffic after the failure of the waypoints,a global shunting strategy is proposed,and the distribution flow simulation is carried out by taking the failure of Zhoukou point as an example.