高速列车牵引变流器的故障机制及可靠性模型

以高速列车牵引变流器为对象，研究其故障机制和可靠性模型。分析了高速列车牵引变流器的组成及各部件的故障机制，建立了变流器的故障树。在此基础上，研究了牵引变流器的可靠性串联模型，进而应用马尔可夫过程分析方法建立了高速列车牵引变流器的马尔可夫模型。利用所建模型推导出牵引变流器的稳态可用度、系统维修系数和系统故障前平均工作时间等可靠性参数，采用Matlab／Simulink软件平台进行建模仿真。结果表明，该模型能有效估计系统可靠性参数，为高速列车牵引变流器的可靠性设计与预测提供了参考依据。

Failure Mechanism and Reliability Model for High-speed Train Traction Converter

The failure mechanism and reliability model are studied for the traction converter. Firstly, the composition and fault mechanism of traction converter are researched, and the fault trees of traction converter are built. Secondly, the reliability series models are explained and the traction converter reliability models are researched. Meanwhile, the Markov model of traction converter is built. Finally, the system steady state availability, the coefficient of system maintenance and mean time between failures are calculated. The Markov model is built via Matlab/Simulink, and the results show that the reliability parameters could be evaluated effectively, which provides a reference for its reliability design and prediction.