Study On Muti-port Stowage Optimization Of Container Ship Considering The Equilibrium Of Quayside Crane Operation

With the advancement of "Belt and Road" economic development strategy,Chinese maritime trade with other countries is becoming more frequent,and the status of container shipping in the national economy has been further improved.As an important part of container maritime transportation,container ship stowage has always been a problem faced by stowage personnel on the premise of ensuring safe navigation.Affected by the increasing number of container ship voyages,each ship is now loaded with containers from different ports of departure and destination,which makes the loading of containers on ships more complicated.If a shipping company wants to ensure on-time rates and improve shipping economy,it should increase container loading and unloading speeds and shorten the ship’s staying time in the port as much as possible under the conditions of ensuring safe sailing.An important means of a goal.How to improve the loading quality of container ships and the economics of shipping is also one of the important research topics in academia.Due to the development of large container ships,the current stowage status of the ship at the port of call has a more obvious impact on the subsequent port operation efficiency.To ensure the overall economy of the ship in a certain voyage,only the container ship’s distribution at the port of departure The loading has not met the development needs of modern container transportation,and the multi-port container shipping has become the focus of research.As the main loading and unloading equipment of the container terminal,the shore bridge is closely related to the loading of the container ship.Under the condition of the parallel operation of the shore bridge,the reasonable operation of the shore bridge makes the amount of shore bridge operation as balanced as possible,which can improve the utilization rate of the shore bridge.Shorten the operation time of container ships staying in the port,and also improve the loading and unloading efficiency of the wharf,thereby achieving a win-win situation between the shipping company and the wharf.In this paper,based on the conditions of parallel operation of shore bridges,comprehensive consideration is given to the balance of shore bridge operations and the amount of container dumping,and the multi-port loading of container ships is optimized.The main research work of the thesis is as follows:First,a multi-port stowage optimization model for container ships that comprehensively considers the balance of shore bridge operation volume and the least container dumping volume is proposed.Considering the problem of multi-port stowage of container ships with the balance of shore bridge operation volume and the least container turnover is a multi-objective combination optimization problem involving many constraints.In this paper,by restricting the parallel operation of shore ports in the model,the paper is within the scope of the shell position The amount of containers to achieve the goal of as much balance as possible in the operation of the shore bridge.By balancing the operation volume of the shore bridge,the utilization rate of the shore bridge is improved,and the latest loading operation time of the shore bridge is reduced.Since the ship’s staying time in the port mainly depends on the completion time of the last operational shore bridge,this article uses the latest completion time of each docking port bridge to represent the ship’s operating time.Including the stacking volume caused by ballast stacks and ballast covers,the mutiport stowage optimization model for container ships with ship stability and strength as constraints.Second,a solution algorithm for the multi-port stowage optimization model of container ships considering the balance of shore bridge operation volume and the volume of container dumping is designed,and the initial feasible solution of the genetic algorithm is generated by adding heuristic rules.First,use the same type of container group as the loading unit,and set the loading priority from high to low according to the docking port of the same type of container group,and load the same container group according to the priority to the bin block At the same time,in order to facilitate the subsequent port unloading operation,when the same container group is loaded to the multi-bay position,the interval range is set for it;then the box area is carried out according to the principle of heavy container loading to the lower layer and light container loading to the upper layer The bins in the block generate the initial stowage plan;finally,the multi-objective genetic algorithm NSGA-Ⅱ is used to optimize the initial stowage plan.Third,the design case verifies the effectiveness and advancedness of the designed model and algorithm.By stowing a container ship with a container capacity of 1877 docked at 5 destination ports,the optimal solution set of the ship’s operating time and container turnover was obtained.Finally,by comparing with the results of existing literature,in the case of optimization,the method of this paper can reduce the ship’s operating time by an average of 23.2%,which verifies the effectiveness and advancedness of the model and optimization algorithm designed in this paper.The research content,methods and conclusions of this thesis are useful explorations and extensions to the research on the optimization of container ship multi-port stowage.The research results obtained have important academic significance for the further study of container ship multiport stowage.Improving the competitiveness of container terminals and improving the economic benefits of shipping companies have important practical value.