Operation Optimization Of The Subway Train Under Moving Block System

Urban Mass Transit (Subway) has the advantages of flexibility, fastness, and high capacity. It has become the effective way to alleviate the modern heavy traffic. Signaling system is the key equipment to ensure its safety and high efficiency. Moving Block System (MBS) is a new type of intelligent train control system based on modern communication, computer technology and control techniques. The research and development of MBS represent the development trend of railway signaling in the 21st century. In recent years, the research of MBS has got in-depth development in Chinese railway. How to evaluate the carrying capacity under MBS and how to optimize train organization in order to make full use of the advantage of high block carrying capacity and the flexibility on schedule are an important field. We focus our research on the determination of the tracking interval time of the train, the running control of a train, the control between the successive trains and the operation adjustment of the trains after the deflection from the timetable for some stochastic disturbance considering the effective absorption of the random traveler flow. The research is based on subway system.1. Firstly, based on the development history and the research of the MBS, we point out there are five technical problems in the Urban Mass Transit: the determination of the train's tracking interval, the operation organization and the technical parameters, the performance of disturbance rejection, the theory and method of automatic timetable adjustment and the synthetical schedule management system.2. The object of the subway is to ensure the transportation capacity. It is discussed under the throughout capacity and the carrying capacity of the line. The main factor which affect the transportation capacity is the throughout capacity and the way of improving the throughout capacity is to reduce the tracking interval time. It is necessary to control the running of the train to ensure the safety of the train under short tracking interval time. The function of Automatic Train Controlling (ATC), including Automatic Train Supervision (ATS), Automatic Train Protection (ATP) and Automatic Train Operation (ATO) are analyzed. MBS will be the further development direction of ATC, so it is important to develop our national ATC.3. After the discussion of the principle of the track, circuit and the control way under different signaling systems: fixed block system, quasi-moving block system and moving block system, and the analysis of the concept of section interval and station interval, the models of the section interval and the station interval of the train in the different railway signaling systems are constructed, the calculation and analyses of running interval are conducted and simulated through MATLAB. Simulation result shows that the throughout capacity has been greatly improved under moving block system compared with other two signaling systems. However, it is not fixed, and is not proportional with the velocity of the train, it reaches the maximum value at certain velocity of the train.4. The running performance of the subway train under moving block system is studied, the dynamics mathematical model of subway train is constructed, and the event-based control technology is adopted to the control problems of subway. The velocity and acceleration function with respect to the distance is deduced by introducing the action reference variable in the control problem, which aims to minimize the running time. The event-based theory and technology has been widely used in the intelligent system, while it has not been used to the control of subway. The simulation result shows compared with other method:neural network control and proportion-differential control,not only the running time but also the passenger comfort can be improved.5. Urban Mass Transit is a hybrid system with the character of motion, and each train is an autonomous vehicle. The cooperation and coordination among the agents is an important index to evaluate the intelligent system. Aimed at the series effect among the trains when the disturbance appear in the time field, the the event-based technology and formation theory are adopted to the control among multi trains. The simulation shows that this method can reconstruct the system easily and increase the cooperation among subsystems with the bi-direction communication and the event-based technology, it also can decrease the series instability in time field effectively, the method can decrease the headway and increase the carrying capacity, ensure the safety and avoid the stop out of station. The work presented in this paper is original and appreciated by the specialists concerned.6. Generally, trains' running obeys arranged timetable strictly, but for some unpredictable reason, it is hard to avoid deflection from the timetable. On urban rail transport system which has character of the short headway, a train's delay may affect other trains; sometimes, it even affects the whole system's normal operation. In the current research of operation adjustment, the object of the train's adjustment is to minimize the delay time of the trains. The problem of the effective absorption of the random traveler flow has not been studied. But the effective absorption of the random traveler flow is very important to the evaluation of the urban mass transit. After the analysis of movement of subway under moving block system, when a train delays out from a station for some uncertain disturbance, a new algorithm is proposed and simulated for the first time, which takes the reducing of train's delay time and the increasing of effective absorption to the random traveler flow as the synthetical object.Finally, the main work of this thesis is summarized, and the future research directions are proposed.