| In recent years,fresh market especially fresh cold chain distribution platform ushered in explosive development.Compared with other logistics,fresh cold chain logistics has the characteristics of strong perishability,high energy consumption and high carbon emissions.At the same time,the global greenhouse effect,energy crisis and other issues become increasingly serious.Therefore,in such an environment,how to reduce carbon emissions and save energy in fresh cold chain logistics,and seek a balance between environmental sustainable development and economy is a serious and urgent problem.In this paper,the fresh cold chain logistics distribution location-routing optimization problem as the research core,based on different actual situations to build a dual model.The main work of this paper is as follows:(1)This paper combs,analyzes and summarizes the literature related to fresh cold chain logistics distribution location-routing optimization in domestic and foreign academic circles from different perspectives,and elaborates and analyzes the concepts and theories related to fresh cold chain logistics and multi-objective optimization.(2)Considering the increasingly severe environmental problems,in view of the problems existing in the transportation of fresh cold chain logistics,combined with the particularity of fresh cold chain logistics,and based on the traditional fresh cold chain logistics location-routing optimization problem,this paper expands the problem and model,studies the location-routing optimization problem of fresh cold chain logistics distribution considering low emissions,and constructs the fresh cold chain logistics distribution location-routing optimization model with the total cost and minimum pollution gas emissions as the optimization objective.At the same time,taking the actual problems encountered in the operation and development of Enterprise A in G city as the background,a specific case of location-routing optimization problem is designed.Through the analysis of algorithm parameter setting,NSGA2 algorithm is used to solve the problem,and the effectiveness of the proposed model is verified.(3)Considering the problems such as reduced cargo distribution efficiency and increased pollution gas emission caused by urban traffic conditions in the logistics chain,this paper expands the problem and model again on the basis of considering the low emission fresh cold chain logistics distribution location-routing optimization problem,studies the low emission fresh cold chain logistics distribution location-routing optimization problem considering road conditions,and constructs a multi-objective optimization model of fresh cold chain logistics distribution location-routing which considers low emissions,multi-vehicle types and urban traffic conditions.To solve this problem,an adaptive multi-population NSGA2 algorithm is designed based on NSGA2 algorithm.At the same time,taking the actual problems encountered in the operation and development of A enterprise in G city as the background,the paper designs specific cases of different types and sizes of location-routing optimization problems,and verifies the effectiveness of the adaptive multi-population NSGA2 algorithm through multiple simulation experiments.In addition,the results of the location-routing optimization model of fresh cold chain logistics distribution considering road conditions are compared with the model without considering road conditions,which verifies the practical significance of the model considering urban traffic conditions.In this paper,under the background of energy conservation and emission reduction,the related issues of fresh cold chain logistics distribution location-routing optimization are studied.Considering different actual situations,the dual model is constructed,which has certain practical significance,and also has certain theoretical reference significance for the management and development of fresh cold chain logistics enterprises. |
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