Research On Modeling And Simulation Analysis Of Rail Traffic Based On Cellular Automata

At the present stage, most of the train control system is based on the moving block in the urban rail transportation, while the train operation is full of complexity and randomness, it is difficult using traditional precise mathematical model to represent. With the rapid development of computer application technology. Computer simulation is not limited to the strict mathematical definition, it is flexible and efficient to simulate the dynamic and complex train operation system, so using computer simulation has become an important way to study the urban rail transit.In this paper, using the basic principles of cellular automata and summarizing the model proposed by related researchers before, combining with Urban Rail Transit traffic driving at short interval and other characteristics such as the interaction between the train is great. Establishing rail traffic model based on cellular automata moving block and verifying the effectiveness of several models. First, we analyze the differences of train track model between relative braking mode and absolute braking mode under moving block, and establish cellular automaton model under turning back operation with two Depot. Taking Chengdu metro line 18 for example, simulating the train actual running behaviors, studying the train delay effected by the number of trains, departure time interval and other operational factors. On the basis of the constant deceleration model, adding traction, braking, resistance and line data, establishing cellular automaton model of a change acceleration, Obtaining the operation behaviors effected by a variety of factors in the actual line. Then studying the application of express and slow trains in the Urban Rail Transit, establishing cellular automaton model based on express/local train mode firstly, we studied the overtaking situation of trains in line under the circumstance of different proportions of departure and different departure time interval, so as to provide a theoretical reference for the line designers and train dispatchers. Finally, every model discussed above is used to compose the train operation simulation system, the system can display train running status dynamically and intuitively, the train diagram exported by the system is consistent with the actual situation, the research results can verify the validity of the model and simulation system.