| Currently,due to the development trends and the peculiarities of the safe operation monitoring of the railway heavy goods vehicles,that heavy goods vehicles in constant need of splitting and grouping,there is no and not allow any wire connection between vehicles.In terms of safety online monitoring, this paper proposed the signal transmission between heavy goods vehlicles based on track circuit.This is another new approach of safety online monitoring of the heavy goods vehicles.In this paper,the structure,working principle and working states of the track ciruit are introduced,and the interference sources of the signal transmission based on track circuit are analysied firstly.Then based on the four-terminal network theory,the mathematical model of track circuit four-terminal network is established.And the mathematical model is verified correctness by the simulation analysis,laying a theorecial foundation for the analysis of the track circuit signal transmission chatacteristics.One of the key elements of this paper is the analysis of the signal transmission characteristics based on track circuit,including the one parameter model and the second parameter model of the track circuit signal transmission.And its frequency characteristics are studied.Then this paper have analyzed the signal transmission based on track circuit with compensation capacitor and with no compensation capacitor,respecitively.Then simulation analysis the influence on track circuit signal transmission from compensation capacitor The simulation results is usefull for the design,optimization,maintenance and fault diagnosis of the track circuit. According to railway signaling design principles and requirements,in this paper,the overall scheme of the signal transmission nodes between heavy goods vehicles based on track circuit is designed.The modular design is carried out from both hardware and software,providing a reference for the development of the practical system. |
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