Abstract
In order to improve the reliability of the metro traction system (MTS), the whole life cycle of metro vehicles can be operated safely and reliably. A reliability assessment method based on the GO method of the MTS is proposed. In this paper, the reliability assessment is completed without operation service failure of the metro vehicle. The maintainability and shutdown correlation of many electrical components in the MTS are considered. An accurate algorithm with shared signals is used. Then the quantitative and qualitative reliability assessment of the system is achieved with the goal of traction system providing traction for the vehicle. The evaluation identifies the weak links of the system. Comparing the completely independent quantitative calculation result of each component with the accurate quantitative calculation results, it is found that the complex correlation in the repairable system has an important effect on the reliability of the system. A comparative analysis is performed on the calculating results of the GO method and fault tree analysis (FTA) method. The results demonstrate that the reliability analysis of the MTS by the GO method is feasible and reasonable. The principle of the method is simple and the logic is clear. It can not only objectively reflect the working process of the MTS, but also fully characterize the complex correlation with shut down fault in the MTS. The qualitative assessment results of the system show that the cut set probability of the pantograph is the highest, which should be the focus of the MTS.
Highlights
As a typical representative of urban rapid rail transit, the metro has played an important role in alleviating urban traffic congestion. e traction system is one of the core subsystems of the metro vehicle
Many reliability analysis methods have been proposed to enhance the safety of engineering structures [1,2,3]. ese studies are mainly the reliability analysis on a subsystem or an important module in the traction system such as traction inverter system [4], IGBT module [5, 6], traction motor [7], and pantograph [8]. e purpose of their reliability research is to improve the reliability of the traction system
Liu et al [9] have put forward a program to evaluate the reliability of CRH3 high-speed electric multiple units (EMUs) traction drive system based on reliability block diagram model. e CRH3 high-speed EMUs running in different lines are studied, but the complex correlation of traction drive system components and degradation conditions are not considered
Summary
As a typical representative of urban rapid rail transit, the metro has played an important role in alleviating urban traffic congestion. e traction system is one of the core subsystems of the metro vehicle. E CRH3 high-speed EMUs running in different lines are studied, but the complex correlation of traction drive system components and degradation (derating) conditions are not considered. Advances in Materials Science and Engineering train traction drive system is studied, but the reliability assessment of the MTS is relatively deficient. In this case, the paper proposed an MTS reliability assessment based on the GO method. The corresponding degraded (derated) condition is determined to evaluate the reliability of the metro vehicle without operation service failure [23, 24].
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