Optimization Of Vegetable Cold Chain Logistics Distribution Routing In Jiulongpo District Of Chongqing Municipality

With the improvement of economic level,people's living standards have also changed.Cold and fresh foods have been favored by people.Vegetables are almost the food we need every day,but because of the characteristics of vegetables,namely perishable,the demand points' delivery time of vegetables makes vegetables have certain requirements for the distribution level of cold chain logistics in the distribution process.This article seeks to meet the time window of the demand point under the condition that the total cost of distribution is minimized to improve the distribution efficiency of vegetables and reduce the time in transit,thus ensuring the quality of vegetables.The cold-chain logistics distribution center of this article is a cold-chain distribution combining self-operation and third-party logistics,which is significant in the investment of costs.When the cold-chain logistics network is constructed,it will appear uncoordinated with development.The problem is that the resources cannot be allocated in a rational and planned manner,the total distribution cost of the cold chain logistics distribution center will increase.The cold chain logistics distribution center conforms to the contemporary development,combines the characteristics of the vegetable itself and according to the current distribution status,establishes an optimal distribution model for the vegetable cold chain logistics distribution path,which has certain practical significance.This article bases on the distribution situation of vegetable cold chain logistics distribution center in Jiulongpo District and optimizes the path.Firstly,the related theories of vegetable cold chain logistics and vehicle routing problems are analyzed and summarized.The development of cold chain logistics and the optimization of distribution routes are introduced accordingly.Secondly,an analysis was made of the distribution center's distribution status and the problems existing in the distribution process.Combined with the timeliness and perishability of vegetables,a cold distribution of multi-vehicle distribution with minimum total cost of delivery and time window and mileage allowance was established.The total objective function of the chain logistics distribution route optimization,that is,the total cost of distribution consists of the distribution costs incurred in the distribution process,the penalties incurred by meeting the time window of the demand point,the decay expense ofvegetables and the cost of the refrigerant consumed by the vehicle.The algorithm solves the path optimization model constructed under the objective function.Finally,by collecting and summarizing the cold chain logistics distribution center data and using the calculation tool MATLAB to solve the distribution route under the model,the optimal distribution route and the optimal value of the objective function of the cold chain logistics distribution center are obtained.Related cold and fresh products provide a certain reference in the choice of distribution route.