Optimization Model Of The Intermodal Transport Routes Of Trunk And Feeder Lines And Disruption Management Of Vessel Schedule Disruption

Due to the continuous sluggish world economy and the slow growth of world trade,the global container shipping industry has deteriorated drastically and the shipping companies have been overcapacity.Liner companies are facing more intense market pressure,so liner companies need to reduce shipping operating costs and improve their competitiveness,while liner companies also need to ensure service quality and efficiency.While the strategy of‘One Belt and One Road'is implemented,in order to explore the impact on shipping routes and optimize the container transport plan,the paper constructs a model of the intermodal transport routes of trunk and feeder lines(Simplified as the intermodal transport routes,employing the improved genetic algorithm to solve the model.Aiming at the fixed number of transit ports of intermodal transport routes,the genetic algorithm based on multi-point crossover mutation and sequential cross-repair was designed to ensure the legitimacy and diversity of the individual code of offspring.The strategy of ‘One Belt and One Road' may cause the change of the transit fee in the huh ports and the increase of the port throughput,and the double-layer optimization model was established based on principle of minimum composite cost to seek the optimized combination scheme of trunk and feeder lines,which included the choices of trunk ports and the calling order of the routes and the operation schemes of the routes.This article studies the number of hub ports,fluctuations in transit fees,and the growth of port throughput,and the optimization results of a liner companies in the Far East-European routes show that when the transit fee increases,the total cost curve will be saddle-shaped with the increase of the number of hub ports,and the number of hub ports corresponding to the lowest point of the total cost curve will also increase.Compared with the traditional shipping form(single pendulum and the surrounding style),the intermodal transport has obvious economic advantages cutting costs 33.33% and 26.30% respectively),and the mainline ship-type is helpful to the cost savings of liner companies,what is more,the vessel type can be increased appropriately to cope with the opportunities brought by container transport along the Belt and Road.We should plan rationally shipping routes based on the definitive information of maritime transport,what is more,we need to deal with uncertainties in shipping.Container ships There is always a long period when container ships complete their sailing,and it is likely to encounter interference events in one shipment,which may affect seriously the delivery of containers and the convergence of ships,thus incurring the loss of reputation of liner companies.This article redefines the common disturbance events of container ships and adopts pre-processing or post-processing methods according to different types of interference events.The model aims at minimizing costs to making up for lost ship schedules.What is more,it can also adopt strategies in advance to respond to interference events that have not yet occurred or have not been affected this shipment.When the total ship cycle is guaranteed to be constant,that is,the ship must be on time to arrive at the final destination port,so it can effectively guarantee the transfer the containers from the feeder ship to the mainline ship,therefor,the interference recovery strategy can also be used in the intermodal transport routes.In this paper,a double-layer planning model is established to combine different interference recovery schemes(combination of port swaps and cancellation of harbor calls,with adjustment of speed and port handling efficiency),and combine Visual Studio with CPLEX to solve the model.The model can provide a better solution to reduce the recovery cost of interference events and reduce the adverse impact on customers.