ABSTRACT

Active suspension system can drastically improve dynamic behaviours of the railway vehicle but will also introduce safety-critical issues. The fault-tolerant analysis, therefore, is essential for the design and implementation of active suspension. However, this issue did not receive enough attention so far and only few papers can be found related to the fault tolerance of active steering for the railway vehicle. In this work, an approach based on Risk Priority Number is established to present quantitative assessment for fault tolerance of actuation system. Then this method is adopted to compare nine different active steering schemes resulting in a novel, comprehensive approach that enables a quantitative evaluation of different designs of the actuation system and of different principles to improve the fault tolerance. The impacts of typical failure modes are investigated through multi-body simulation and quantified by severity factor. Finally, the fault tolerance of different actuation schemes is evaluated by RPN values.

摘要

主动悬架系统可以显着改善铁路车辆的动态性能，但也会引入安全关键问题。因此，容错分析对于主动悬架的设计和实现至关重要。然而，该问题至今没有得到足够的重视，有关铁路车辆主动转向容错的论文很少。在这项工作中，建立了一种基于风险优先级的方法来对驱动系统的容错进行定量评估。然后采用该方法比较九种不同的主动转向方案，从而得出一种新颖、全面的方法，可以对驱动系统的不同设计和不同原理进行定量评估，以提高容错性。通过多体仿真研究典型失效模式的影响，并通过严重性因子进行量化。最后，通过 RPN 值评估不同驱动方案的容错性。