Study On Parallel Simulation Of Rail Traffic Flow Under CTCS-2 Train Control Mechanism

Train operation control system is the guarantee of train operation safety.The train tracking method and the rail transit flow characteristics directly affect train operation safety and line passing capacity.Studying the principle of train control system,establishing the model and algorithm of train operation control,and simulating and analyzing rail transit flow can provide theoretical and technical support for the development of rail transit system.In the simulation process,the parallel computing idea is introduced,which is helpful to improve the simulation operation efficiency and is of great significance to the actual research of rail transit.In the CTCS-2 control mechanism,this paper uses parallel computing to study the simulation of rail transit flow.The main research contents and conclusions are as follows:(1)Firstly,the study on the overall structure and operation principle of the CTCS-2 train control system is carried out.In this control mechanism,the movement authority is generated mainly based on the track circuit codes,and the vehicle-mounted equipment determines the target distance and calculates the speed monitoring curve according to the received track circuit codes.According to the code sequence update logic determined by different modes of receiving and sending trains at the station,combined with the composition and model characteristics of cellular automata,the CTCS-2 train movement model based on track circuit coding is established.Many models are given which includes a more realistic traction and braking variable acceleration calculation model,the speed limit curve calculation model,the speed update calculation model and the movement model of a train at stations.(2)Secondly,according to the above train movement model,to improve the simulation efficiency,parallel computing is applied to the simulation of rail transit flow.On the basis of the conventional serial algorithm,the train movement parallel simulation based on CTCS-2 train control mechanism is established.In the algorithm,the partition occupancy status update,the track circuit code sequence update,the target distance calculation,the speed calculation and are explored,and the process of data communication between master and slave nodes in the parallel algorithm under the parallelframework with single program and multiple data is elaborated.(3)Finally,based on the MATLAB simulation platform and in combination with the actual situation in railway operation,the initialization parameters of railway lines and trains are set to build a parallel simulation system based on the CTCS-2 train control mechanism.The space-time diagrams by parallel simulation are consistent with those of rail transit flow obtained from serial simulation,and the calculation time of the parallel simulation is less than that of the serial simulation,which verifies the rationality and effectiveness of the train movement model based on track coding and the parallel algorithm.At the same time,the influences of the departure interval and dwelling time on rail transit flow are analyzed,which further testifies the practicability of the established system.