Parallel Monitoring Of Train Temporary Speed Restriction And Reliability Analysis

Safety and reliability is an important goal of railway development.The Train control system is used to ensure the safe and reliability of train operation.Improper implementation of temporary speed restriction may directly lead to serious traffic accidents.At present,the temporary speed restriction is based on the design of a single channel,it is impossible to completely avoid the occasional failure of the temporary speed restriction setting,verification and cancellation.Therefore,the TSRPMS(Temporary Speed Restriction Parallel Monitoring)and its reliability research are of great significance to ensure the safe operation of trains.This paper designs the TSRPMS structure based on the CTCS-3 and analyzes its reliability according to the requirement of temporary speed restriction function of rhe CTCS-3.Firstly,the TSRPMS two-channel structure is described,and the parallel monitoring principle of temporary speed restriction in the process of setting,verification and cancellation is analyzed in detail.Secondly,in order to evaluate the reliability of the TSRPMS,the UPPAAL tool was used to establish the time automata model of the TSRPMS and verify its reliability,and the the GO-Bayesian method was used to quantitatively calculate the reliability of the TSRPMS.Finally,the TSRPMS software is designed and developed to realize the temporary speed restriction parallel monitoring function.The main contents are summarized as follows:(1)The TSRPMS scheme and parallel monitoring principle are proposed.According to the design characteristics of temporary speed restriction single channel in the CTCS-3,a temporary speed restriction parallel monitoring two-channel structure was constructed,and a temporary speed restriction comparator was added.The temporary speed restriction could be implemented only when the comparison results of different links are consistent,so as to ensure the correctness of the temporary speed restriction.(2)The feasibility of the TSRPMS was verified by the UPPAAL.In view of the real-time and complexity characteristics of the temporary speed restriction control process,The UPPAAL tool was used to verify the feasibility of the temporary speed restriction control process.According to the parallel monitoring principle and the technical specification of the dedicated passenger traffic line temporary speed restriction system,the attribute of function and bounded liveness requirements of the TSRPMS are proposed,the time automata model of the TSRPMS is established,and the system attribute of function and bounded liveness were verified by using formal grammar.(3)The TSRPMS reliability calculation based on the GO-Bayesian method.The reliability of temporary speed restriction system and the TSRPMS is quantitatively calculated by using the fault tree method considering common cause failure,the GO method and the GO-Bayesian method.The results show that the TSRPMS is more reliable than than the temporary speed restriction system,and the GO-Bayesian method Go-bayes method simplifies the complexity of the calculation process of GO method.It is an effective and practical quantitative analysis method.(4)Simulation realization of the temporary speed restriction parallel monitoring system.Based on Visual Studio 2013 development environment,the TSRPMS simulation software was built to realize the parallel monitoring of the setting,verifying,executing and cancelling of the temporary speed restriction,and verify the feasibility of the parallel monitoring system of temporary speed restriction.The research results show that the TSRPMS designed in this paper can effectively supervise and confirm the setting,verifying,executing and cancelling of temporary speed restriction orders.The design of the TSRPMS meets the requirements of the safety and bounded liveness,and the reliability of the TSRPMS is higher than that of the temporary speed restriction system.The research of this paper will provide strong practical and theoretical basis for the application of parallel monitoring technology in the temporary speed restriction system.This thesis has 55 figures,14 tables and 81 references.