| In recent years, with the improvement of living standards, the requirements on food quality are increasing, as an important part of quality assurance, cold chain logistics also has been developing rapidly. Urban agriculture cold chain logistics is an important branch of cold chain logistics, but due to the uncertainty of the urban environment, the distribution efficiency is low. Vehicle routing problem(Vehicle Routing Problem, referred VRP) is an effective way to optimize logistics and distribution, combining with the characteristics of agricultural products and urban distribution in city, research on the Vehicle Routing Problem for Cold Chain Logistics urban distribution of agricultural products, rationally planning of vehicle routing contributes to optimize distribution network and improve distribution efficiency. This paper takes cold chain logistics and distribution of agricultural products in city as research subjects, and researches on vehicle routing problem.The main works of this paper is as follows:Firstly, this paper analyzes the development of the current cold chain logistics and the importance of cold chain, summarizing the common research methods and results of vehicle routing problem as well. On this basis, the paper summarizes the basic mode of urban cold chain logistics of agricultural products and explores the effects of road congestion in urban cold chain distribution.Secondly, this paper establishes a research model of cold chain logistics VRP for agricultural products in city and solves it. Combining with the complexity of the urban road network, this paper analyses the urban cold chain logistics network. Based on the traditional model of VRP, this paper takes the impact of road congestion on logistics and transport into account, and constructs the model for shortest distance. With the characteristics of the model, this paper combines the Dijkstra algorithm and the VRP algorithm to solve the problem.Finally, by the case study of Lianhua supermarket in Hangzhou, we analyses the proposed model and verify the feasibility and effectiveness of the proposed model and algorithm.The paper study the vehicle routing problem for urban cold chain logistics of agricultural products followed the routes of literature review, theoretical induction, model building and solving, case study, which has theoretical and practical value. |
