Optimization Research On The Reliability Of Harbin Railway Administration CHR5 Bullet Train’s Sliding Plug Door

Nowadays CHR5 metro vehicle systemis serving as the most important subsystem of high speed train in our country. With the rapid development ofspeed there has been an urgent need for more safety and more seal one. The subway door is one of the most important part of it which we can’t stressenough. As we all know the lower reliability of the subway door threatensthe safety of the state property and passenger’s personal life.To improve the reliability of the door system it was employed in the process optimization that fault tree analysis and equipment failure mode effect analysis(EFMEA) based on calculating the reliability index of main fault part of the door in this paper.First, two fault concentrated part, mechanical transmission system and driving system, had been found by pareto chartafter survey the reliability of sliding-plug door. Goodness of fit tests was used for interval time of the data, maximum likelihood estimation method for the parameter estimation and the Pearson chi-square test statistic for the hypothesis testing by Minitab software.Itwas obtained that the failure distribution function of the sliding-plug door’s mechanical transmission system and electric system of CHR5 metro vehicleandidentified its reliable evaluation index. then all the failure modes such as cut set, path sets and structure importance degree, probability importance degree and critical importance were analyzed by the fault tree analysis(FTA).The characteristics of occurrence, function and way of the system failure were derived from that function which provide a sufficient basis for countermeasures.Secondly, this paper introduced the risk priority number(RPN)of EFMEAfor the reliability of sliding-plug door of CHR5 metro vehicle which wasrespectively applied to the bearing mechanical system of sliding-plug door, the drive system, the control system, the unlock mechanism and sensing system. and then analyzed each failure mode, failure consequences, severity, causes, frequency, control measures, measures, etc. After that, the author identified the key failure mode of damage degree in each system through the RPN value, thus formulated the sliding-plug door liability control scheme for the critical failure mode of CHR5 metro vehicle.Finally, the implementation and safeguard measures for the sliding-plug door reliability optimization of CHR5 metro vehicle were discussed in this paper on the basis of the completeReliability index calculation, and then some schemes and measures fit for the current system were puts forward. At the same time, this paper also compared the effect of before and after the optimization and prospect to improve the reliability in the future for reliability optimization scheme of the CHR5 metro vehicle, s sliding-plug door. In order to make the maintenance process more flexible, efficient and scientific, it was recommended that more detailed distribution model need to be establishedunder the existing framework of preventive maintenancefor different systems and components by failure data analysis.