摘要
大型的安全关键系统由许许多多的部件组成,为了既能监测到系统故障,又能减少系统的计算负担,需要对部件上的警报器放置进行优化。本文论述了如何对警报器的数量和位置进行优化,并讨论了报警功能的需求和特性、优化警报器的放置目的,以及利用失效模式影响和危害性分析(FMECA)来给节点的失效危害程度予以评级。通过对燃气SCADA系统的两个不同的警报器放置实例对比,说明了采用FMECA方法分析,给失效危害程度级别高的节点优先放置警报器,再结合多重错误检测(MFD)算法,能正确地找出故障产生的来源节点。
A large safety critical system is usually composed of thousands of components. In order to detect the failure and reduce the computing burden of the system, it is significant to optimise the alarm placement on the components. This paper discusses on the optimising for the numbers and position of alarm, requirements and properties of a^arm function, the objective of alarm placement optimising, and how to use FMECA to rank the nodes with cdticelity. Through the comparison of the two different cases of alarm placement on a natural gas SCADA system, it proves a feasible way to identify the source node producing the fault by alarm placement on the nodes with the prior cdticality ranked by FMECA and using the MFD algorithm in computing.
