Optimization Of Core Operation Planning In Rail-water Intermodal Container Terminals

As "One Belt One Road" initiate was proposed,international trades between China and other countries have been rapidly developed.Container transportation,as an advanced modernized transportation,has the advantages of convenience,efficiency,energy-saving,safety and environmentally friendly.In current international trade situation,container transportation plays an increasingly important role in freight transportation in the international trade.Rail-water intermodal container transportation,as an important part of container transportation,integrates the advantages of railway transportation and water transportation well,and has become a rapidly rising transportation mode.Rail-water intermodal container terminals are the main place of rail-water intermodal transportation.The operational efficiency and production efficiency of rail-water intermodal container terminals have vitally crucial impact on the rail-water intermodal container terminal's operations.Meanwhile,the rail-water intermodal container terminal's operations not only involve the traditional port operations,but also include the operations of railway container terminals.This makes the rail-water intermodal container terminal's operations more complicated.Therefore,it is of importance to optimize the operation plans of rail-water intermodal container terminals reasonably to enhance the operational efficiency and production efficiency of rail-water intermodal container terminals.The research object of the paper is the core operation plan of rail-water intermodal container terminals,and the research target of the paper is core operation planning optimization.Meanwhile,the paper analyzes and studies on the theory and method of the core operation planning optimization problems in rail-water intermodal container terminals deeply.The main contents of this paper are as follows:(1)Definition of the rail-water intermodal container terminal and its core operations.Compared with the traditional container terminals,the rail-water intermodal container terminals are defined.According to the analysis of the function,layout pattern,operation mode and operation procedure of rail-water intermodal container terminals,the final layout pattern of rail-water intermodal container terminals is defined.Meanwhile,based on the description of the operation procedure of inbound and outbound containers in rail-water intermodal container terminals,the core operations and their core operation plans are defined.(2)Architecture construction of core operation planning optimization in rail-water intermodal container terminals.According to the analysis of the core operation planning optimization problems in rail-water intermodal container terminals,the frame of core operation planning optimization problems is established.To provide the theoretical support for subsequent studies,the formulation of the core operation planning optimization problems is described under the analysis of the constraints,decision variables and optimization objectives.(3)Study on container stowage planning optimization considering quay crane operations.Under the architecture of the core operation planning optimization,according to the analysis of the structure,stability and strength constraints of containerships and stowage principles,the influence of quay crane operation on stowage planning is considered on the basis of the traditional stowage planning problem and a multi-objective stowage planning model is developed considering quay crane operations,whose objective is to minimize the dwell time of containers and the total number of shifts during the voyage.According to the characteristics of the proposed model,a genetic algorithm based on the new encoding mode is introduced to solve the model,which depends on the attributes of containers,handling strategies of containerships and operation strategies of quay cranes to encode chromosomes.Finally,some computational experiments verify the proposed model and algorithm.(4)Study on slot allocation of the mixed storage of railway and road containers considering stowage planning.Under the architecture of the core operation planning optimization,according to the analysis of the storage mode,storage principles and the arrival characteristics of railway and road containers,a container slot allocation model is proposed,considering the stowage planning and the arrival characteristics and mixed storage mode of railway and road containers,with the aim of reducing the overlapping amounts.To solve the model effectively,firstly,forecast the arrival orders of road container by using Markov chain so that the arrival orders of road containers are determined;then use the heuristic algorithm to solve the slot allocation model.Finally,some computational experiments verify the proposed model and algorithm.(5)Study on bidirectional synchronous handling operation planning optimization of"yard-railway operation area".Under the architecture of the core operation planning optimization,according to the analysis of the operation characteristics of rail mounted gantry cranes,inner trucks and yard cranes,a mixed integer programming model of rail mounted gantry cranes,inner trucks and yard cranes is established,considering synchronous handling operation,inner truck congestion,traveling time of rail mounted gantry cranes and yard cranes,safety distance between rail mounted gantry cranes.The objective of the model is to minimize the makespans of handling operations.To solve the model,an improved multi-layer genetic algorithm is developed,which introduces the balanced operation and floating proportion of inner truck traveling time to solve the inner truck congestion problem.Finally,some computational experiments verify the proposed model and algorithm.