A Decision Model For The Evolution Of Container Liner Route Mode Under The Upsizing Of Ships

In recent years,with the advent of global economic integration,the volume of world trade has increased significantly,and the level of science and technology has made great progress.Driven by economies of scale,container ships are developing towards the trend of large size.Coastal cities all over the world pay attention to the key role of container transportation in world trade and have to strengthen the construction of their own port conditions to meet the needs of the development of container transportation business to attract more cargo exchanges.How to ensure that the cargo volume of the port can choose the size of the ship,in this case,the choice of liner route structure form is particularly important.In this paper,the container liner route system is taken as the research object,aiming at the influence of larger ships on the structural form of container liner routes,considering the complex relationship in the evolution process from basic port mode to core port mode under the difference of export cargo volume of different ports,the balance relationship between the number of shipping routes and operational benefits and operational efficiency in basic port mode is taken into account.In the core port model,the negative relationship between the number of core ports and the trunk line freight rate,the relationship between the core port location and the shipping toll and the branch line cost,and the influence of the basic port and core port route mode on the profit rate of route investment.In this paper,the decision-making problem of the evolution of container liner route mode under the condition of ship upsizing is proposed.On the premise of keeping the shift frequency and full freight rate unchanged,a three-stage mixed integer programming decision-making model is constructed with ship size,mode selection,core port number and location as decision variables,and the maximum profit rate of voyage investment as the objective function.A heuristic genetic algorithm is designed to solve the problem.Finally,taking the Far East to North America route as an example,through the optimization results and numerical analysis,the practicability and effectiveness of the model construction and algorithm design are verified.