Study On The Optimization Of Location-Transportation In Post-Earthquake Distribution Of Emergency Materials

China is located in the Pacific ring of seismic belt and the Eurasian seismic belt,its special geographical location causes high frequency of earthquake disaster,especially several large-scale earthquakes in recent years,its casualties caused a certain impact on the people’s heart,seriously affecting the stable development of society,forcing people to pay attention to earthquake rescue.In the face of the severe disaster after the earthquake emergency,rescue operations are urgent to the disaster areas that need many emergency materials to save the lives of the victims and to guarantee basic life.In order to improve the rescue efficiency and minimize the casualties and economic losses,scientific and effective emergency material distribution system must be established to optimize decision-making efficiently and ensure the overall stability and sustainable development of rescue activities.Based on the background of emergency material distribution and summarizing of the current research situation of LRP,this paper analyzes the characteristics of the emergency material distribution system,and studies the fuzzy multi-objective static LRP of emergency materials distribution and the dynamic LRP in the emergency material distribution system after the earthquake.The following aspects for the main research content and innovation:Firstly,according to the integrated optimization of emergency logistics system in the initial post-earthquake,considering the different supply of each material supply center,and based on the sudden and random of earthquake,the demand information of each affected point can not be accurately obtained.Therefore,the initial emergency materials demand has a great fuzziness.At the same time,considering that the urgency of each emergency material is different,the destructive earthquake may cause partial disruption of road network,the different transport capacity and material supply,a single stage fuzzy multi-objective static LRP model is proposed to decide the location-allocation and transportation routs.According to the characteristics of the model,designing an improved genetic algorithm,and finally the calculation example shows that the model and algorithm have high operational efficiency.Secondly,in order to solve the problem of multi-level facility location-path planning,and taking into account with the continuous advance of the earthquake relief,the decision maker needs to update the demand of the demand point and the road network condition according to the collected data.Therefore,the initial LRP model is further improved into a dynamic multi-objective model of two level facility.The dynamic LRP is transformed into the traditional static LRP,and this paper presents a new two stage heuristic genetic algorithm to work out the problem with the location of disaster relief materials distribution centers and emergency distribution centers,the combined scheme of transportation modes and routes in the upper and lower levels.This algorithm improves the traditional genetic algorithm from the aspects of coding method,fitness function,genetic operator and so on.Finally,a numerical example is given to illustrate the effectiveness of the model and the algorithm by analyzing the penalty coefficient and the influence of the control parameters.Then,Taking Yushu earthquake as an example,Verify the efficiency of Feasibility,stability and operation efficiency of the the dynamic model and algorithm,according to the characteristics of the model,design a kind of ant colony algorithm and comparison with the results of genetic algorithm.Finally,the paper summarizes the content of the study,and analyzes the shortcomings of the study,and the future research directions.Hoping that this paper can provide scientific basis for government departments to improve the efficiency of emergency rescue,reduce the damage,and dispatch the vehicles scientifically and rationally.