Urban Fresh Vegetable Distribution Based On System Dynamics Model.System Optimization Study

The distribution of fresh vegetables is directly related to the quality of life for urban people.The research of fresh vegetable distribution system is mainly aimed at the process of vegetables entering the distribution center from the production base,then simple packaging and storage through the distribution center to each demand point.In this process,the location of distribution center and the choice of distribution path have a direct impact on the control of distribution cost and environmental protection.Based on the investigation and analysis of fresh vegetable distribution system in Changsha,this paper summarizes the present situation of vegetable distribution system in large cities,and divides the vegetable distribution system into three nodes according to the transfer:direct distribution,primary transfer distribution and secondary relay distribution.By using the method of system dynamics modeling,this paper optimizes and studies the distribution system from the two aspects of distribution center location and distribution path.The results show that all the factors of the distribution system affect each other,so we must proceed from the whole system to ensure the correctness and validity of the model.The application of the model optimizes the node layout and distribution path by accelerating the node transformation and upgrading,improves the operation ability,fully improves the function of both the logistics distribution center and the wholesale market,and promotes the procedure and standardization of fresh vegetable logistics operation,increase the utilization rate of specialized distribution vehicles,so as to reduce the loss ratio of each link in circulation.Based on the data of Changsha fresh vegetable distribution system,the key factors between nodes and nodes are analyzed.According to the internal distribution model of nodes,transmission distance,flow processing efficiency,temporary storage capacity and cycle packaging,it is found that the cost of carbon emissions can be reduced by using energy-saving electric vehicles and reducing the average distance of vehicles,improving the allocation ability of internal operation nodes,reducing the attenuation rate,it can effectively reduce the carbon dioxide emissions in the system.Finally,suggestions for improvement of the node interior and the node are put forward respectively.