Research On Semi-physical Simulation System Of Urban Railway Trackside Equipment

With the accelerated pace of national urbanization process and surge of urban population, urban railway transportation system is increasingly used in large and medium sized cities in our country, for its advantages of high-speed, safety, energy conservation, environmental protection and -unaffected by the road and weather conditions. It has become an significant solution for solving the city’s traffic congestion problems. The communication based train control systems (CBTC) is the most advanced railway signaling system, and it is widely used in railway transportation projects in cities. As one of the most important parts of urban railway signal system, the simulation of trackside equipment of train control system not only reproduces normal scenes such as the route arrangements and trains’ operation, but also assists researchers to study on train group control and operation stress test. Therefore, it is of significance in system verification and related scientific research to do this trackside equipment simulation research.The modeling and simulation of trackside equipment of CBTC rely on the CBTC simulation and test platform. The modeling method combined with Unified Modeling Language (UML) and Colored Petri Net (CPN) is scientifically proposed for trackside simulation system, interfaces are designed between trackside simulation system and other systems.Firstly, modeling method combined with UML and CPN is proposed for testing and verification requirements of trackside equipment on urban rail train control system. UML model on trackside simulation system is built, then CPN model is also established by using the conversion method of state diagram to the CPN model, which is analyzed to prove the correctness of the model under the CPN Tools environment.Second, trackside simulation system is divided into two parts from the angle of realization, which is communication interface section and logical function section. In the communication interface section, this paper mainly describes and analyzes semi-physical safety relay interface, distributed CAN bus communication networks’ principles and specific applications and designs relay combination used by trackside equipments under laboratory conditions. For the logical function section, it develops the software of trackside simulation systems on the platform of Visual Studio 2010, also describes the main function process and proposes algorithm such as locating balise, searching occupied track section and setting fault.Finally, it is achieved to test CAN bus communication, relay combination and software of trackside simulation systems. And the functional requirements of trackside semi-physical simulation system is verified and analyzed through coupling test with other systems.