| With the rapid development of China’s economy and service industry,transportation has become particularly important.Among all kinds of transportation modes.Railway transportation as a medium and long-distance,environmentally efficient,safe and fast transportation method in China,which plays an irreplaceable role.Especially in recent years,the implementation of the "one belt,one road" and "Asia-Europe class trains" and other strategies have put forward higher requirements for railway transportation.As the junction of railway direction and the connection point of special railway,the work of railway terminal has a great impact on the whole railway transportation.Efficient railway terminal organization work will be of great significance to improve freight turnover and reduce transportation cost.Based on the above research background,this paper studies the optimization of placing-in and taking-out operation system of local train on branch-shaped siding network in the railway terminal.First of all,this paper introduces the research background and significance of the optimization of placing-in and taking-out operation system of local train on branch-shaped siding network in the railway terminal.Then summarizes and analyzes the literature at home and abroad to find the starting point of this study.Furthermore,the related theories related to the optimization of placing-in and taking-out operation system of local train on branch-shaped siding network in the railway terminal are introduced,so as to better understand the relevant operation mechanism in the railway junction.Secondly,this paper takes the two major optimization objectives of the railway terminal’s turnover time and transportation cost as the research main line,so as to carry out a detailed discussion.In order to speed up the freight train turnover and improve the efficiency of railway transportation,the turnover time in railway terminal is taken as the optimization objective.Turnover time refers to the total sum of the total dwell time of all trucks from the disintegration time of the marshalling station tothe moment when the marshalling station is retrieved after the freight wagon loading and unloading operation is completed.Considering the practical constraints,a mathematical model is established.In view of the complexity of the mathematical model,A hybrid algorithm IGA & SA combined with parameter adaptive genetic algorithm and simulated annealing was proposed to solve the problem.Experimental scenarios were designed to verify the examples,and the algorithms were compared.The transportation cost in railway terminal is taken as the optimization objective,so as to save the transportation cost and reduce the waste of resources.The transportation cost consists of the waiting cost for engine early arrival,the penalty cost for engine late arrival,and the operating cost of engine and the wagon.Considering the actual constraints,the mathematical model is established,and the solution idea is innovated.The HH-GAP & AIP solution strategy is designed,and the experimental scenario is designed for example verification,and the algorithms were compared.Finally,the paper summarizes and prospects the optimization of placing-in and taking-out operation system of local train on branch-shaped siding network in the railway terminal.This paper summarizes the main contents of this study,that is,the research questions,the established model,the design solution strategy and so on.Based on the actual situation,this paper puts forward the inadequate aspects of the research,and looks forward to such problems in the future and may need to pay attention to the problems and research directions. |
