| In terms of earthquake,it is the geological disaster that causes the largest economic loss and the most serious casualties among all the natural disasters in the world.Due to the suddenness,urgency,instantaneousness and the heavy casualties caused by earthquake,it is necessary to take efficient emergency measures after the earthquake,so as to timely and accurately provide emergency rescue materials for the demand point,as well as minimize the casualties and property losses.To ensure the life safety of the people after the earthquake,it is necessary to provide decision-making reference for the emergency management department after the earthquake,enhance the response ability of the emergency logistics system,and establish an efficient emergency logistics system after the earthquake.When it comes to the key to study the emergency logistics system after the earthquake,it lies in how to plan the emergency Vehicle Routing Problem(VRP)and Location Allocation Problem(LAP).LAP and VRP interact and depend on each other,so,in this thesis,it optimizes LAP and VRP at the same time,to study the Location-Routing Problem(LRP)in the emergency logistics system after the earthquake.By comprehensively analyzing the research status of emergency logistics system,VRP and(LAP),at the same time,considering the characteristics of emergency demand and LRP in the emergency logistics system after the earthquake,in this thesis,it constructs the multi-objective LRP initial model aiming at minimizing the total distribution time and total cost of the system.However,it will happen many uncertain interference events in the process of material distribution after the earthquake.If the material distribution is carried out according to the original distribution scheme,it will inevitably lead to the failure of meeting the time window and demand of some demand points.At the same time,it will make the newly-added demand points unable to get emergency materials,which may further cause more casualties.Therefore,it is necessary to adopt corresponding adjustment measures after the emergence of interference event to effectively deal with the interference events and minimize the disturbance to the system while meeting the needs of the people in the disaster area.Based on the analysis of the research status of Disruption Management,it is found that there are few studies on the application of Disruption management in emergency research after the earthquake,and the existing studies focus on single interference factors,while the research on combined disruption factors is less.Therefore,this paper analyzes the possible interference events in the LRP in the emergency logistics system after the earthquake,and choosing the combinatorial disruption of increasing demand and the increasing demand point to study.Then,it makes the analysis on the impact of combinatorial disruption of increasing demand and the increasing demand point on the demand point,vehicle driver and government,which also designs the corresponding disturbance quantification method.Using the disturbance recovery strategy of ?proximity strategy? and ?additional dispatch strategy?to rescue the disturbed demand points.Based on the principle of minimum disturbance to the system caused by interference events,it takes the minimum deviation of customer satisfaction,path and cost as the goal to construct the model of Disruption Management for LRP.Finally,by analyzing the advantages and disadvantages of various algorithms to solve the problem,the improved genetic algorithm is designed to solve the LRP initial model and model of Disruption Management for LRP after the earthquake.By comparing the Disruption Management optimization plan with the rescheduling optimization plan,it verifies the effectiveness of the model and algorithm by the simulation analysis of strong earthquake in a region of Sichuan in Longmenshan seismic belt,which has played a guiding role for the Disruption Management for LRP in the emergency logistics system after the earthquake. |
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