Research On Train Organization Of Container Sea-Rail Combined Transport Under Uncertain Disturbance Conditions

With the continuous increase in the throughput of international container ports,searail combined transportation has become an important way for international container transportation to extend from the port to the inland.In recent years,in the actual production and operation of China’s sea-rail combined transport,the mismatch and imbalance in the sea-rail combined transport collection and unloading process have been improved,the seamless connection between port ships and sea-rail combined transport trains has been promoted,and the port and railway combined drastic increase in the volume of evacuation and multimodal transportation of containers has become an urgent problem to be solved.Based on this background,this paper studies the problem of container sea-rail intermodal train organization under uncertain disturbance conditions.The main research contents of the paper are as follows:(1)This article puts forward the research ideas and methods of the thesis on the basis of reviewing the existing research,and expounds the uncertainty theory,collaborative optimization theory and multi-objective optimization theory involved in the research process of the thesis.(2)Analysis of the problems in the organization of container sea-rail combined transport trains.First,analyze the flow of container unloading operations for sea-rail intermodal transportation.On this basis,analyze the relevant factors affecting the organization of container sea-rail intermodal trains.Secondly,conduct in-depth research on the operating elements of container sea-rail intermodal trains.The analysis of the disturbance factors of the train operation organization of the sea-rail intermodal transportation has clarified the uncertain disturbance types of the container sea-rail intermodal train organization problem,and provided a theoretical basis for the establishment of the relevant model for the optimization of the container sea-rail intermodal train organization.(3)Research on optimization of container sea-rail intermodal train organization under recoverable disturbance conditions.First,a brief description and analysis of the problem of container sea-rail intermodal train organization under recoverable disturbance conditions are carried out,and it is clarified that the problem is the composition of container sources of container sea-rail intermodal trains under the condition of arrival ship delays,railway station loading and unloading resource scheduling,and trains.A comprehensive optimization problem of the number of vehicles is compiled,and then under the constraints of the time window of the train schedule,a recoverable disturbance condition is constructed with the goal of maximizing the transport volume of the sea-rail intermodal train port after the arrival of the container and minimizing the cost of the loading and unloading equipment in the railway operation area.The optimization model of the train organization of the sub-container sea-rail combined transportation,and the non-dominated sorting genetic algorithm with elite strategy is designed to solve the model,and finally verified by a calculation example.The research results show that: when the uncertainty disturbance is small,that is,when the delay time of the ship is short,by adjusting the structure of the container source of the sea-rail intermodal train and optimizing the loading and unloading resource scheduling plan,it is possible to meet the time constraints and constraints of the sea-rail intermodal train.The optimal plan for operational requirements ensures that the sea-rail intermodal train will be operated as originally planned,so that uncertain disturbances can be restored.(4)Research on collaborative optimization of container sea-rail intermodal train organization under irreversible disturbance conditions.First,through the analysis of the uncertainty of the container sea-rail intermodal train organization,the dynamic adjustment strategy of the container sea-rail intermodal train organization is clarified,and a rolling plan preparation scheme is proposed.A nonlinear integer programming model for cooperative optimization of container sea-rail intermodal train organization under disturbance conditions,and an improved genetic algorithm solution model based on container flow distribution is designed.Finally,calculation examples are designed for different disturbance situations.The research results show that when the sea-rail intermodal transport system has an irreversible disturbance,the port can effectively carry out the port container sea-rail intermodal train and sea-rail intermodal transport according to the arrival time,destination,and delivery deadline of the port sea-rail intermodal container.The transportation organization of other sea-rail intermodal trains minimizes the degree of sea-rail intermodal disturbance recovery,and ensures the timely drainage of container flow.At the same time,the effectiveness of the model and algorithm is verified.