Research On Optimization Of Inland Port Multimodal Transport Channel Based On Coupling Analysis

Recently,the efficient operation of multimodal transport systems centered on inland ports has been of great interest to the government.In 2017,the Ministry of Transport and 18 other departments jointly published the Notice on Further Encouraging Multimodal Transport,which included the inclusion of multimodal transport development in the national strategy.With the Belt and Road initiative proposed and the development of the Yangtze River Economic Belt strategy,the strategic position of the inland port as an international trade hub has been further enhanced.Under this opportunity,how to improve the internal connection efficiency of the inland port multimodal transport system and reduce the total cost of intermodal channels has become a major concern for inland port managers.Based on the above background,this paper conducts a coupling analysis on the connection of the inland port multimodal transportation system from a micro perspective to optimize the connection time of nodes.On the basis of coupling analysis,an optimization model of multimodal transportation channels is constructed to reduce the total cost of intermodal transportation and improve the efficiency of intermodal transportation connection.The specific work of this paper is as follows:On the first stage: the coupling analysis of the multimodal system.Firstly,is analyzes the factors of operational efficiency of the multimodal systems and constructs coupling evaluation indicators.And then,starting from the nodes of multimodal transport mode conversion,the coupling degree is calculated by using the ratio of input to output.Considering the connection of the node transport mode,the single transport mode and cross transport mode coupling functions are designed respectively.And the construction of a seamless connection coupling model for multimodal transportation channels is on the basis of node coupling function design.On the second stage: the integration mechanism designs of the coupling functions.It calculates the coupling degree of different nodes by using the coupling functions and designs the government subsidy by using the segmentation function.The coupling degree can be converted into the government subsidy coefficient to calculate the subsidy coefficient of each node.And then the coefficient integrates into the objective function of channel optimization modal in the form of cost to realize the coupling data-driven in the optimization process.On the third stage: the construction of optimization model of the inland ports multimodal transport corridors based on coupling analysis.The path optimization of the OD channel and the selection of hub node sets the minimum multimodal system operation cost as the goal.It reduces the total cost and connecting time of the multimodal transport system.On the last stage: the design of the genetic algorithm with correction strategy and empirical analysis.Based on the constructed model and the basic principle of genetic algorithm,the genetic algorithm with correction strategy is designed to solve the model.Finally,taking Chengdu International Railway Port as an example for empirical study.By evaluating the coupling degree of the hub nodes,the results show that the coupling degree of Chengdu,Urumqi,Wuhan,Xi ’an,Xuzhou,Zhengzhou and other nodes is higher,followed by Nanchang,Nanning and other cities.After optimizing the channel layout of Chengdu International Railway Port,the results show that the total transportation cost of all OD is reduced compared with that before the optimization.The hub points of the Chengdu International Railway Port radiating across the country should choose cities such as Anyang,Chengdu,Nanchang,Wuhan,Xuzhou,and Zhengzhou.According to the results of path optimization,the freight rates and transportation time of containers sent from Chengdu International Railway Land Port to cities across the country can be obtained.