Research On The Train Assignment Problem Of The Bidirectional Marshalling Station

The railway hub which is an essential component of the railway-net is a significant -transportation organization work and production base on railway transportation system. The essence of the research on marshaing station mainly exists in the investigation of the relationship of dispatched train as well as its sourcing wagons, which is also called "wagon-flow". As for the Bidirectional Marshalling Station, the main reseach include these probelem: Firstly, the problem of whether the arriving train should connect to up or down yards. Secondly, what flows comprise each train departure. Thirdly, what the best arrangement of breaking up and formation. If these concerns cannot be solved effectively, the great influence will be made to the normal operation of the railway hub, which will result in problem such as traffic staying within the marshalling yard for too long time and the increase of operating expenses of the entire hub.This thesis has successfully dealt with the following issues: First of all, the optimal receiving yard of the trains'arrive; Secondly, the optimal starting direction of the trains' departure; in accordance with factors such as the composition of a dispatched train and anglular flows and the proportion of traffic stops and the field of distributed systems determining the balance of market access of other trains and other distributed field. Thirdly, the crossing interference; the appropriate time for a particular car flow; Fourthly, the analysis of sourcing wagons' departure; Fifthly, vehicle current calculating car flow prediction; on the basis of the train existing in station, the expected receiving car flow and the loading and unloading train, to calculate the time that can be effectively used and the number of specific car flows,etc. Finally, we make a study of the realization of this calculation, offer a definition of the appropriate structure data, and complete the development of the system, mainly including the detailed design of wagon-flow list.After summarizing the relevant research both at home and abroad, this paper analyzes the shortcomings of the reading literature and proposes this paper's purpose: Through the marshalling operation, how to make the trains going in different directions form the starting of trains of the same direction, to fulfill the largest turnout number, the shortest period of the stopping time, the minimum cost of adaptation. During the implementation, we can realize that the result got by mathematics cannot satisfy the need of the scene, so we proposes a method warmly-accepted by workers- wagon-flow list. Through wagon-flow list. We intuitively describes the relationship of starting and arrival traffic flow, matching with the adjustment instrument, to realize the combination of theory and practice. Then,the paper offers the optimal methods of soving these problems.However, these equations are the N-P questions. so this article gives satisfactory solution for the algorithm(the best receiving yard, the starting composition of the train traffic, the disintegration of the order of grouping). Practice has proved that these methods are superior to manual methods and can meet time requirements.Finally,the thesis gives the design of system and process of implementation,including methodologies, tools, objective design, the main process flow.By using the method of math, We analyzed related technical operations of wagon flow about the trains' departure and automatic diverging-Flow, set up a mathematical model, solved the model with intelligent algorithm, exploited the tools of Jbuilder and technology of EJB and independently completed the phase of the development of automatic generation subsystem.Good convergence among the various modules,various functions of the system and all the desired objectives are achieved. Meanwhile, the accuracy and reasonableness of mathematical model of the system are also verified. At present, the system has been put into a Xinfeng Town Marshalling Station very effectively.