Research On Site Selection Of Emergency Logistics Facilities And Path Planning Of Relief Materials Distribution Based On Railway Transportation

Railway transportation has the advantages of being efficient,stable and economical.With the rapid development of national railway network construction,the transportation capacity has been significantly improved,and the total freight volume has been continuously improved.Railway transportation has become the main way of emergency relief materials distribution.With the progress of society,there are new requirements for emergency logistics management in the new era,among which site selection and path planning are two crucial issues.Scientific and reasonable site selection and path planning will help improve the efficiency and reliability of the entire emergency logistics system,which has great research value and significance.Site selection and path planning are interrelated and mutually restricted,in order to establish a more efficient railway emergency logistics system,this thesis integrates and optimizes two important phases of preparation and response for emergency management,and makes a systematic study on the site selection of emergency logistics facilities and the route planning of relief materials distribution based on railway transportation.Based on the literature of site selection and path planning at home and abroad,according to the emergency management knowledge,this thesis studies the site selection and path planning of emergency logistics based on railway transportation.Firstly,the elements involved in the model construction are systematically analyzed,and the weights are sorted from subjective and objective angles by using Analytic Hierarchy Process and Fuzzy Comprehensive Evaluation respectively,and the elements with the highest priority,namely time and cost,are obtained.Furthermore,according to the emergency logistics management process,in the preparation phase,a site selection model for emergency logistics facilities with known candidate points and unknown number of construction points is constructed with the objective function of minimizing the comprehensive costs including construction cost,operation cost,transportation cost,emergency loss cost,etc.In the response phase,a path planning model of relief material distribution is constructed with the objective function of minimizing comprehensive consumption time including material preparation time,distribution time and overtime penalty time,etc.To be more realistic,the priority of emergency demand points is also considered.Finally,through consistency treatment,a two-phase multi-objective emergency logistics management model of comprehensive site selection and path planning is constructed.To design the solution strategy of the model,cloud adaptive genetic algorithm is introduced to overcome the disadvantages of slow solution speed and easy local convergence of classical genetic algorithm.The rationality of the proposed model and the effectiveness of the solution strategy are verified by the analysis of an example.In the case analysis of Guangzhou Railway Group,according to the established model,based on the cloud adaptive genetic algorithm,Feifengpo Station,Huizhou North Station and Nanjiangkou Station are selected as emergency logistics facilities from several alternative points.Based on the above site selection results,the corresponding path planning schemes are compared under the constraints of whether or not to consider the priority of emergency demand points.Finally,the comprehensive decision-making scheme of emergency logistics management preparation and response phase based on railway transportation is summarized.This study may provide a new idea and an example for decision makers of emergency logistics management departments of Guangzhou Railway Group.