High-Speed Railway Train Diagram Adjustment Based On Train-Set Connection Optimization

The scheme of railway train-set circulation is an important part in operation, which not only determines the number of needed train-sets, but also influences the quality and enablement of the station operational plan seriously. Train diagram is a critical input data of planning train-set circulation. Train scheduling, train-set circulation and the station operational plan are interdependent. Based on the all-in-one of transportation organization, it is essential to study the circulation of train-set while considering timetable optimization.Based on the well-known research achievements at home and abroad, the paper study the flow of timetabling based on "through" station and the circulation of train-set. To get optimal connection between train lines, the adjustment method and model for timetable based on feedback are proposed. The following components are involved:(1) The factors and the feature of high-speed railway train-sets circulation is analyzed. To get more connection between train lines without a direction change, the model of train-set circulation is put forward and a compact connection algorithm is then designed.(2) The adjustment method of timetable based on the distribution of superfluous time is studied. While considering the adjustment method based on the connection with or without direction change, the maximum adjusted quantity of train line is calculated. If there is no adjusted space or it is hard to get the adjusted quantity when using the adjustment method, the model which can describe all the constraints between related train lines based on the feedback of train-set’s circulation is more important. Then the model for feedback and adjustment is proposed to attain most connections, especially without direction change in through station between train lines.(3) Combined with analysis of specific cases to verify. The result of the case shows that the model of train-set circulation for "through" station increases the constraints between related train lines without direction change. If there is no need to get big adjusted quantity, choose the adjustment method, then adjust the train lines which are the planned connection firstly; After the ultimate adjustment, there is no change for the timetable’s structure and slight adjustment of travel time about train lines, and most important of all, the quality of circulation plan is improved obviously based on the station capacity satisfied.This paper makes efforts to study the cyclic train diagram establishment, train-set circulation and their feedback and optimization, while considering the robustness of route assignment and the number constraint of station tracks. Hopefully, it can lay the foundation for the action ability to station working plan, and provide theoretical support to integrated train operational scheme.