铁路信号PES安全性定量分析的研究

Study on Quantitative Safety Analysis on Programmable Electronic System Used in Railway Signaling

铁路信号中的可编程电子系统 (PES)是一种安全相关系统。这类系统更注重失效 -安全 ,而不仅仅是可靠性或可用性。基于系统的可靠性分析方法 ,给出了一种安全性定量分析方法。通过把失效率划分为一些独立的部分 ,据其各自失效率的影响 ,利用 Markov模型可同时分析系统的可靠性和安全性。笔者根据铁路信号 PES常用的 2 oo2 D(附加诊断的二取二 )

Programmable electronic system (PES) used in railway signaling is a safety related system, which lays more stress on the ability of fail safe, not merely on the reliability or availability. Based on the method of reliability analysis, a systematic method for quantitative analysis of safety is provided. Through dividing the failure rate into several individual parts, and according to the effect of each part of failure rate, the reliability and safety of he system could be analyzed simultaneously by Markov model. A practicable example is given by using the 2oo2D fault tolerance structure routinely applied in the PES of railway signaling.