Research On The Invulnerability Of Logistics Network Under Cascading Failure

Logistics industry has become the national economic artery with the rapid development of social economy. It plays an important role for the safe and steady operation to maintain the rapid growth of social economy and people’s life stability. Frequent emergencies began to severely test the proper functioning of the logistics network, sudden or arbitrary interference in the network events can lead to certain failure of a node or edge, which triggered a chain reaction of cascading failures, etc. in turn caused a serious impact on logistics network system or destroyed. Therefore, it has become the key technology of modern logistics enterprises that how to understand and grasp the failure propagation dynamics process and the rule of logistics network, formulate the corresponding remedy or protective measures to reduce the extent of damage, prevent the happening of the chain reaction and enhance the logistics network invulnerability for cascading failure. Under this background, in view of the logistics network of cascading failure under invulnerability problem arises at the historic moment.Based on the failure of nodes and edges, this paper firstly analyzes the invulnerability of logistics network under cascading failure. Secondly, on the basis of rational quantification of node importance, we further improve and enhance the cascade failure model which used to evaluated the invulnerability of logistics network. Finally, the paper establishes the structure of the cascade failure model based on the relational network structure, and the applicability and accuracy of the invulnerability evaluation method in logistics network are to further expand Specific research work is as the followings:(1) Set up a node cascading failure model and analyze the invulnerability of the logistics network.Firstly, it divides the node type of logistics origins, destinations and the intermediate based on OD demand characteristics of the logistics network. Secondly, it constructs logistics network structure according to the logical business link relationship between logistics nodes, on the basis of it a node cascading failure model is set up and it analyzes the effects of logistics network invulnerability caused by the logistics origins, destinations and the intermediate which occupied the most resources. Thirdly, it is found that through numerical simulation analysis, the impact on the network invulnerability of circulation logistics node failure is much larger than other general OD nodes and intermediate nodes. Finally, the simulation results verify the theoretical analysis of rationality.(2) Set up an edge cascading failure model and analyze invulnerability of the logistics network.First of all, based on the diversity of the actual logistics transportation mode and logistics transportation interruption phenomenon, it builds an invulnerability evaluation model of logistics under the edge cascading failure. Secondly, combining with the actual logistics business in the process of choice in the direction of sex or transshipment, it evaluates invulnerability of transportation under the interruption of logistics network. According to the numerical simulation analysis, we realized that when the logistics and transport networks meets traffic jam, network damage thresholds under the directivity obtained is less than that without considering the direction of the case, which means the former network invulnerability is greater than the latter. Finally, the simulation result is verified by the theoretical analysis of rationality.(3) Set up an invulnerability evaluation model under logistics network cascading failure based on the overall importanceFirstly, based on the impact of network node importance for the spread of cascading failure, combined with logistics nodes of services, location and service delivery efficiency factors logistics to comprehensive quantify the importance of each node.Secondly, based on the combination of node importance on directional logistics operation, it develop a sudden load shunt rule node after failure and builds a cascading failure model to expand assessment for network invulnerability. Finally, after numerical simulations, we realized considering the comprehensive importance degree of the considered nodes that, network for cascading failures undermine the resilience-which we call network invulnerability-is better than that without considering the degree of importance of the node, in which way, further enhance the network invulnerability assessment accuracy.(4) Set up a node cascading failure model and analyze the invulnerability of network based on the logistics interdependent network structure.Firstly, it analyzes the interdependent network structure constructed by actual logistics network and traffic. Secondly, it quantifies the degree of importance of nodes and edges link strength in the interdependent network structure, on this basis to develop rules shunt failure load and then builds a cascading failure model to assess the logistics interdependent network nodes under the sudden failure of invulnerability performance. Finally, with the help of the numerical simulations, we realized cascading failures associated with the interdependent network structure to withstand greater than the threshold under single network architecture. This shows that invulnerability under interdependent network is less than that situation under single network; in which way further improve the logistics network invulnerability assessment accuracy.