Transportation Optimization And Express Network Optimization Based On Multimodal Transport

Multimodal transport is a complex form of transport that combines multiple modes of transport,which can effectively improve the utilization of transport resources and reduce the total cost of transport.This paper studies the optimization of transport routes in multimodal transport scenarios and the integration and optimization of express network structure and transport routes.It finds out the transport routes and express delivery network structures with the lowest total cost and meeting the transport time limits,Businesses provide decision support.The main contents and achievements of this paper are as follows:(1)The multi-modal transportation route optimization model is established,and a modified A*algorithm is designed to solve the model.In this paper,a multi-modal transportation route optimization model is constructed based on the urban node transport network diagram,and an improved A*algorithm is designed to solve the problem.The transport route with the lowest total cost and meeting the transport time limit is obtained.Then,a numerical example is given to verify the model.It is concluded from the analysis that changes in the deadlines,transportation costs,transit costs and other factors will all affect the choice of transportation routes and modes of transportation.(2)Establishing a multi-modal express delivery network integration optimization model with multi-point to multi-destination.In the case of multi-modal transport,the paper analyzes the model based on the hub-cum-express delivery network,and optimizes the express network structure with the lowest total cost and the mode of transport of each express route according to the amount of express delivery,the cost and the time limit Number of flights.Finally,an example is used to verify the model.The conclusion is drawn that the change of transportation cost,sorting cost and single node express volume all have an impact on the network structure.Reducing the cost of a transportation mode will increase the number of sections of the transportation mode,However,the increase of sorting costs will reduce the number of sections and affect the network structure.The reduction of the single-node express delivery will result in the reduction of links with the node.