Simulation And Research On Train Movement Control Based On Car Following Models

As the moving automatic-block system can effectively reduce the interval between successive trains in blocks and stations, and improve the carrying capacity of rail traffic, it has become the development trend of signal system. However, the influence between successive trains is also enhanced for the intervals of them are shortened in moving block systems. Considering the characteristic of rail traffic system, we establish several train following models based on car-following models in this thesis. We also simulate some complex phenomena of train movement through those models. Further, we study the feature of train movement. The main contents and results obtained in this thesis are as follows:1. According to car following models and rail traffic characteristics, the first train following model is established based on OV model. We can get the space-time diagram, time-acceleration diagram and so on by simulating the model to investigate the rail traffic flow features. The relationship between speed, acceleration, space and time has been analyzed, which confirms that the model is able to response the train's running characteristics in the rail traffic system. Numerical simulation results demonstrate that our model can well reproduce some actual railway traffic phenomena in moving automatic-block system.2. Because the max-acceleration is not usually equal to max-deceleration, we build several improved train following models based on OV model and Full Velocity Difference Model respectively. Position-acceleration diagram and position-velocity diagram of one train are also used to study the characteristic of rail traffic flow. By using this model, we draw the time-space diagram, time-acceleration diagram and time-velocity diagram. Furthermore, we also draw position-acceleration diagram and position-velocity diagram for one train in the railway traffic flow. The relationship between speed, acceleration, space and time has been analyzed. The safety of railway traffic has also been verified by time-pure headway gap diagram. Variations of acceleration and velocity among different models are significant. The lower the frequency of variation is, the better will be for train traffic control.3. Comparison is made about the train movement characteristics in different train following models based on car following models, such as length between two starting trains and the station dwell time. The simulating result validate that the moving block system can improve the operating efficiency of the rail traffic system.