面向不同生命周期的计算机联锁设备可靠性综合评估

Comprehensive Reliability Assessment of Computer Based Interlocking Equipment for Different Life Cycles

系统阐述一套面向信号设备不同生命周期的可靠性评估方法集合,针对设备研发或测试阶段,提出一种基于加速寿命试验的可靠性分析方法,能够在高应力条件下,通过较短时间获取设备失效数据建立阿伦尼斯(Arrhenius)模型,从而推导在正常应力剖面下设备的平均无故障工作时间(MTBF)。针对设备在线运营阶段,提出一种基于现场维护数据的失效率分析方法,在故障发生时间数据不符合特定分布的情况下,通过非参数估计法,准确分析设备耗损状态。以计算机联锁(CBI)设备为例,开展两种可靠性评估方法实践,并通过两种方法的分析评估结果,交互验证不同可靠性评估方法所建模型的准确性、一致性。

This paper describes a set of reliability assessment methods of signaling equipment for different life cycles.A reliability analysis method based on accelerated life test is proposed for the equipment research&development or testing phase,so that the equipment failure data can be obtained in a short time to establish the Arrhenius model under high stress conditions.Thus,the equipment mean time between failures(MTBF)can be derived under the normal stress profile.Moreover,a failure rate analysis method based on field maintenance data is proposed for the equipment field operation phase,so that the equipment wear state can be accurately analyzed through the non-parametric estimation method when the failure occurrence time data do not conform to the specific distribution.These two reliability assessment methods are put into practice by the example of computer based interlocking(CBI)equipment.The accuracy and consistency of the models built by different reliability assessment methods are cross verified through the analysis and assessment results of these two methods.