动车组轴箱轴承在线监测可靠性评估模型研究

针对进行状态监控的动车组轴箱轴承提出了一种在线评估可靠性的新方法:动车组轴箱轴承系统以及部件的退化过程受具有时移的非线性维纳过程影响,该过程作为协变量集成到比例风险模型中用以描述故障时间的危险率;将退化路径和时间轴进行离散化,通过转移概率矩阵获得可靠性量的闭式解;与仅适用于少数退化状态的传统方法不同,该方法只需对转移矩...

Online Reliability Evaluation Model of EMU Axle Box Bearing

A new method of online reliability assessment for EMU axle box bearing under condition monitoring is proposed.Since the degradation process of the EMU axle box bearing and components is affected by the nonlinear Wiener process with time drift,it is integrated into the proportional hazard model as a covariate to describe the hazard rate of failure time.By way of discretizing the degradation path and the time axis,the closed-form approximation of the reliability value could be obtained through the transition probability matrix.Unlike the traditional method that is only suitable for a few degraded states,this method can be completed only by performing basic operations on the transition matrix with high computational efficiency,and therefore is suitable for real-time reliability state calculation.The method proposed in this paper can perform online reliability assessment,prediction,health management,and the remaining service life prediction of bogie axle box bearing.