Research On RBC Level Transition Scenario Based On Directed Graph And CPN

Railway industry has developed rapidly in recent years, train safety problems becomemore and more important with the train speed increasing. Now a subject how to increase trainspeed and ensure traffic safety is worthy of studying. Train control system is our reference toEuropean standards and applies innovation in high-speed railway system, it uses advancedcomputer and communication technology, improving the safety and efficiency of trainoperation. Analysis validation work is more complex due to the large system. On this basis,formal modeling method which has rigorous mathematical definition and clear graphicalrepresentation has developed rapidly an important method to describe and analyze thecharacteristics of train control system in recent years in the field of train control.The thesis selects CTCS level-3of train control system level transition scenario to study.It uses colored Petri net (CPN) tools kit to build model, and analyzes influence train speed,message retransmission time and time delay characteristics on train control system based onresearch of directed graph tranfer to CPN and the thought of hierarchical modeling.Firstly, the process of information exchange between RBC and vehicle equipment inlevel transition scenarios is described based on the analysis of interactive information betweenRBC and other subsystems in CTCS level-3train control system, and it has completedtransition to directed graph to CPN through theoretical analysis of directed graph and CPN.Secondly, the CPN modeling and simulation tools are introduced to analyze the CPNtools functional requirements and uses the hierarchical modeling ideas to divide the functionmodel of the level transition scenario. Then it takes the GSM-R application layer mode, theperiodic and non-periodic message model as the underlying model, and apply it toestablishing communication meeting model, CTCS-2level train control model going intoCTCS-3level train control model and CTCS-3level train control model enters CTCS-2leveltrain control mode and then modeling for each model using CPN.Finally, the simulation on the model and do sorting on the data in the CPN tools. Thenthe simulation on the data by using Matlab software. Combined with GSM-R applicationlayer model, it analyzes the periodic and non-periodic message model delay under differentmessage retransmission interval. It analyzes the completed success rate of the CTCS-2leveltrain control model enter the CTCS-3level train control model and the CTCS-3level traincontrol model enter the CTCS-2level train control model at different speed and the traincontrol success rate of the downgrading model resulting by equipment failure under differentmessage retransmission interval.