Research On Optimization Of Post-disaster Emergency Logistics Network Considering Facility Failure

The occurrence of natural disasters has seriously threatened the lives and safety of the people,brought great economic losses and unrest to the society,and also increased the difficulty of disaster emergency management for the government.After the disaster occurs,the government needs to immediately launch rescue operations and take emergency rescue measures to save the lives of more people in the disaster area and recover as much social property as possible.In the total crisis rescue actions,urgent goods are the key to guarantee the surviving of the person in the disaster region,at that moment,the affected area will produce a big need of supplies in a relative short period of time,so it is crucial to make a proper and active distribution solution for the entire rescue progress.This thesis focuses on the multi-stage distribution of emergency supplies after disasters,and applies various research methods such as multi-objective optimization,augmentation constraint method and multi-objective particle swarm algorithm on the characteristics of postdisaster emergency supplies demand and emergency rescue activities,and constructs a multistage optimization model of secondary emergency supplies distribution network considering facility failure,a multi-stage optimization of tertiary emergency supplies distribution network considering facility failure model,and a multi-stage emergency material distribution network optimization model considering alternative distribution points under facility failure.The main contents are as follows:In the multi-stage optimization model of secondary emergency material distribution network considering facility failure,a multi-stage mixed integer planning model of emergency material distribution considering fairness of emergency material distribution and material stock quantity at distribution points under facility failure was established for the problem of emergency material distribution under the oversupply of materials in the early post-disaster period,taking into account the emotion of calming the victims and the phase characteristics of post-disaster relief.distribution points to demand points for emergency material distribution,and analyze the Zhengzhou flood event,the results show that: the change of each type of material supply at supply points has a greater impact on the overall fairness of emergency material distribution;within a certain minimum weighted total distance of material distribution demand,the overall fairness of material distribution and the total cost of material distribution have There is also a positive correlation between the overall fairness of material distribution and the total distance of material distribution within a certain total cost of material distribution.In the multi-stage optimization model of three-level emergency material distribution network considering facility failure,we consider the characteristics of post-disaster relief,facility failure and repairability,and dynamic changes of material inventory at each stage of supply and distribution points,etc.With the objectives of maximum fairness of emergency material distribution and minimum total system cost of material distribution,we construct a multi-stage distribution model of multiple supply points,multiple distribution points and multiple demand points considering facility failure.The model is solved by multi-objective particle swarm algorithm,and the findings indicated that the fairly material distribution and the total system cost increase gradually with the increase of supply quantity at the supply point;the fairness of material distribution decreases and the total system cost increases gradually with the increase of demand quantity;the penalty cost increases when the demand point does not meet the demand.The fairness of material distribution and the total system cost gradually decrease as the demand increases.In the optimization model of multi-stage emergency material distribution network considering alternative distribution points under facility failure,due to the impact of disasters,distribution points may fail and be too late to be repaired,when alternative distribution points are opened to provide services for demand points.Based on this,a multi-stage distribution model of emergency supplies is constructed by considering the failure of the facility to open alternative distribution points,the relationship between demand and supply of different supplies at each stage and their dynamic change characteristics,such as the quantity of supplies distributed from the supply point to the distribution point or alternative distribution point does not exceed the maximum storage capacity of the distribution point or alternative distribution point within the stage,and the dynamic change of the inventory of each type of supplies between the supply point and the distribution point or alternative distribution point,etc.The results show that as the capacity of distribution points and alternative distribution points increases,the fairness of emergency material distribution increases,and as the supply quantity of supply points gradually increases,the overall fairness of emergency material distribution gradually increases and then gradually stabilizes.This thesis analyzes and researches the optimization problem of multi-stage distribution of emergency materials,taking the heavy rainfall in Zhengzhou,Henan Province as an example to verify the feasibility of establishing a model.The constructed model has certain reference significance for the distribution of emergency materials and it can be a certain way of thinking for the work of emergency decoration,and at the same time enrich the content of the studying of emergent substances.