Research On Importance Of Road Network Node Based On Key Node Failure

Transportation network is a complex weighted networks which is consitituted by transport network nodes and the connecting line between the nodes.At the same time,it is also a collection formed by nodes and edge organic.The assessment of the importance of nodes is closely related to the transport capacity and impedance between the nodes,as well as traffic network topology structure.In transportation network characteristics,to establish reasonable standard of node importance evaluation systerm has valuable guidance significance in traffic management,disaster prevention,traffic and transportation planning,designs of roads and facilities.The premise of this article research is in a major traffic node paralysis to make a revaluation of traffic network nodes.This paper based on the study of the related literature and researsh at home and aboroad,puts forward a sort of network average weighted efficiency comparison of before and after cascading failure process caused by node failure, proposes the concept of the overload function,load capacity,tolerance coefficient and so on,and gives the definition and calculation mode of these parameters.By contrast,the paper gives a measure of node importance based on the node failure which has been experimented in Beijing Zhongguancun area in accordance with the theory.The experiment and its results verify the validity and feasibility of theory.Through the comparison with general practice,it’s highlighted the rationality in traffic network specific conditions in this theory,and puts forward an application based on the theory,namely emergency strategy design on traffic accident.In the end,it summarizes the theory’s innovation and the rationality,questiones the need to be improved and be perfected,and puts forward a future research direction.I hope through this series of studies, it can bring good effect to the future research work and traffic guidance.