Research On The Optimization Of Urban Dairy Cold Chain Logistics Distribution Under Uncertain Demand

With the rapid development of China's economy,people's living standards have been greatly improved,and the demand for nutritious dairy products is also increasing,which provides a greater opportunity for the development of China's dairy cold chain logistics industry.Generally speaking,dairy products have high requirements for freshness,and because of their short shelf life,they have extremely strict requirements for storage conditions and temperatures.If unreasonable operation occurs during storage or transportation,it is easy to cause bacteria and microorganisms,which will have a greater impact on the quality of dairy products and even endanger people's health.In order to avoid such problems,it is necessary to guarantee the temperature control of the cold chain distribution of urban dairy products.As far as the actual situation is concerned,China's dairy cold chain logistics has basically entered a stage of refined development,and related companies have paid more attention to the distribution of dairy products.At this stage,we should pay attention to two points for cold chain distribution of urban dairy products:on the one hand,we need to clarify whether the logistics service level inspection indicators have the ability to deal with customers' uncertain needs,and how to effectively deal with time window restrictions;on the other hand,dairy products are usually The requirement for delivery time is high,and it will be affected by the time factor during transportation and cause losses,resulting in increased costs.Based on the urban cold chain distribution,under the actual urban traffic congestion,it is necessary to explore how to control the out-of-stock cost and the cost of cargo damage while improving customer satisfaction within the time window,and finally achieve the optimal cold chain logistics distribution cost as a research distribution The key to the optimization problem.In this paper,we first analyze and analyze the situation of cold chain logistics at home and abroad,and elaborate on the theoretical content related to the location of the distribution center and the vehicle path,which leads to the problems of the location-path optimization of the distribution center.To provide a detailed introduction to the theory of bi-level programming for the problem of distribution center location-path optimization.Subsequently,the characteristics of dairy products were introduced.Through detailed analysis of influencing factors such as time window restrictions and retailers 'uncertain demand,the cost of cargo damage,penalty costs with time windows,vehicle costs and out-of-stock costs were considered to build a city under uncertain demand.A bi-level programming model related to dairy cold chain logistics distribution site selection and route optimization.The optimal distribution center is selected in the upper model,and the optimal distribution path is determined in the lower model.The upper and lower models restrict and interact with each other.Finally,the genetic algorithm was used to solve the problem,and Dalian K Group Dairy Co.,Ltd.was selected for example analysis to verify the scientificity and effectiveness of the proposed model and algorithm.