Research On LRP Problem Of Emergency Logistics System Considering Priority

In recent years,emergencies such as natural disasters and other public disasters have become the main factors threatening human security,causing great troubles for people’s production and life,directly affecting the development of economic and progress of social.In order to reduce the losses caused by disasters,it is necessary to establish a scientific and reasonable plan to carry out emergency rescue to the affected areas in the shortest time to minimize the losses caused by disasters.Therefore,scientifically locating emergency facilities and optimizing emergency materials distribution systems have become the key to improving the emergency protection and reflection capabilities of the entire logistics system and enhancing system stability,timeliness and reliability.This paper first introduces the background of emergency logistic,combines the characteristics and the content of emergency logistics system to systematically analyze the location and path of emergency logistics.Based on the analysis of background and research of theoretical,it puts forward the research focus and gives the mathematical definition of priority to prepare for the construction of logistics LRP model that considering priority.The main work of this paper is as follows:(1)Aiming at the problem of emergency logistics system optimization in the post-disaster emergency response phase,this paper construct a static single-level LRP model of priority logistics distribution center positioning and material distribution,and introduce the priority of disaster points as a necessary constraint,and analyze the facility capacity limit,the impact of time windows on the LRP network.An NSGA-II algorithm based on natural number coding is proposed to solve the problem,and a numerical example is designed to analyze the model.The results show that the emergency logistics system that takes into account the priority can shorten the waiting time of the disaster points in the emergency rescue,effectively improve the rescue efficiency and the satisfaction(2)Considering the multi-stage nature of emergency rescue and the obstruction of road traffic,it is necessary to dispatch aircraft to complete the material distribution task.The single-level LRP model was further improved,and a dynamic multi-level multimodal LRP model of priority distribution of emergency supply distribution center,emergency material distribution center location and the planning of material dispatching was established,and the joint decision problem of facility location and distribution route planning was analyzed.The dynamic multi-level multimodal LRP model is used to analyze the joint decision-making problem of facility location and distribution route planning.According to the characteristics of model,a multi-stage dynamic algorithm based on real-valued coding is designed.The Jiuzhaigou "7.0" earthquake is taken as an example to verify the feasibility of the model and algorithm.The comparative analysis between considering priority and not considering priority is made,the results of them show that the priority logistics system has obvious advantages in emergency rescue,and can ensure the emergency response efficiency while making the system the shortest total time.Through the research on static single-level LRP and dynamic multi-level LRP network,the following conclusions are drawn by comparing and analyzing the scenarios with priority and without priority:① The LRP network considering priority ensures the fairness of rescue,improves the efficiency,shortens the waiting time and optimize the system as a whole;② The dynamic multi-level LRP network enriches the emergency logistics planning theory and more in line with the emergency rescue in the actual scene.There are 38 figures,39 tables,and 75 references.