In order to monitor and warn the leakage fault of air control valves in train braking system, rapid analysis of fault characteristics is the key premise. The relay valve used in train braking system was taken as an example in this paper. Its working principle and physical structure were clarified, and the leakage fault was divided into internal leakage and external leakage based on the airflow direction. The simulation model of relay valve was established, and the internal and external leakage faults were simulated by using the model-based fault injection method. The influence laws of leakage faults on the output pressure and balance state of the relay valve were analyzed, and it was found that the relay valve had a dynamic balance position besides the tri-state position. Finally, the leakage simulation bench test was carried out, and the test results show that the relay valve model could correctly analyze the leakage fault characteristics, and the output pressure could be used as the fault characteristic to warn leakage faults. The method proposed in this paper provides an effective way to analyze the fault characteristics of braking system and can be used to obtain fault data for fault diagnosis.
In order to study the rail temperature change caused by the linear eddy current brake, aiming at the problem that the nonlinear magnetic conductive material is difficult to be calculated by the theoretical and numerical calculation methods, the finite element model of the linear eddy current brake and the rail is established by using ANSYS workbench simulation platform. The eddy current loss generated inside the rail is calculated in the transient magnetic field simulation, and it is used as the thermal load of the transient temperature field. The temperature field model is calculated by the magnetic-thermal coupling simulation method, and the curve of the temperature of the rail head surface, the curve of average temperature of rail and the distribution of rail temperature are obtained. The curve of average temperature of the rail obtained through the simulation method and the results calculated by the law of energy conservation are compared, the correctness of the simulation model is verified.
Aiming at the lack of fault data and online simulation difficulties in the intelligent operation and maintenance of the braking system of trains, the braking system of high-speed trains was taken as the research object in this paper, and the fault online simulation method of braking system was studied. First, by analyzing the structural composition and functional principle of the braking system, a simulation model of the braking system was established by using AMESim software. Secondly, the fault injection methods for different faults of the braking system in the AMESim simulation model were proposed. Then, in order to achieve real-time fault injection, LabVIEW and AMESim were jointly simulated to establish a multi-domain digital model of the braking system. Finally, some typical faults of the braking system were injected into the multi-domain digital model for online simulation and compared with the theoretical analysis results. The results show that the outputs of fault online simulation are in good agreement with the theoretical analysis ones. The method proposed in this paper provides an effective way to obtain online fault simulation data for intelligent operation and maintenance of the braking system of trains.
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