Track Circuit Modeling And Simulation

With the fast development of international economy, both city scale andpopulation are incessant expanding. So the capability of urban traffic must beenhanced. Using urban railway transit as principal part to form an integratedtraffic network, which is the only way to resolve the problem of big city traffic.In order to design and improve Track Circuit, it is necessary to build up thetrack circuit full-digital and part-object simulation system. This paper presentssome research on the modeling and arithmetic of digital coded audiofrequency jointless track circuit, which are mostly used. It also provides adetailed scheme for the track circuit full-digital and part-object simulation.Compared with the results of digital simulation and the actual measurements,they have the same trend and precision in digital simulation accords with thedesign's demands. That is to say mathematic models of track circuit areaccurate and usable. It also can be a basis for the task's practicability in thefuture. In addition, this paper discusses in the way on how to realize theprogrammable high-frequency AC electronic load that is the core technologyof interface circuit.The primary contents of this paper are listed as follow.Model building and digital Simulation of four-poles net Circuit. Based oncircuit, power and communication theory, track circuit can be divided intoseveral parts and mathematic models are established for these modules and thewhole system. It includes four-poles net circuits, electrical sectionalizing joints,transformers, cables and so on. This paper introduces the model building andsimulation of all states of four-poles net circuits such as adjust and shut states. Basedon mathematic modeling, this paper chose soft development system anddesigned simulation experiments. By comparing digital simulation results withthe real testing results, the result of simulation fits well with real data.Part-object Simulation of Track Circuit. Basing on the digital simulationfor Track Circuit, this paper provides Part-object simulation system. This paperprovides a new project of the combination of analog operation circuit anddigital simulation calculation that is part-object simulation and interface. Andit achieves a setting of digital simulation in-out interface resolving thedifficult problem of Track Circuit part-object simulation interface. In addition,...