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arXiv 1909.07210eess.SYcs.SYeess.SP
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数字给水控制系统的可靠性和安全性建模

Reliability and Safety Modeling of a Digital Feed Water Control System

Shawkat S. Khairullah, Ahmed A. Mostfa

摘要:

许多数字化仪表和控制系统嵌入在关键的医疗保健设备,航空航天设备和核工业有明显的后果,不同的故障模式。如果没有适当地检测和修复可能是嵌入在数字系统内的硬件组件或软件代码的任何缺陷区域,则这些故障可能影响整个安全关键数字系统的行为及其传递其可靠性属性的能力。安全关键系统的安全性和可靠性分析可以通过马尔可夫建模技术来实现,该技术可以表达数字控制系统的动态和再生行为。系统中的某些状态表示系统故障,而其他状态表示无故障行为或存在故障时的正确操作。本文提出了一种基于马尔可夫链模型的数字给水控制系统安全可靠性建模方法。假设所有的马尔可夫状态和这些状态之间的转换,并根据数字控制系统的控制逻辑计算。最后,基于数字给水控制系统建模的仿真结果,系统满足其可靠性要求,在6个月时间内处于完全运行状态的概率为0.99。

英文摘要:

Much digital instrumentation and control systems embedded in the critical medical healthcare equipment aerospace devices and nuclear industry have obvious consequence of different failure modes. These failures can affect the behavior of the overall safety critical digital system and its ability to deliver its dependability attributes if any defected area that could be a hardware component or software code embedded inside the digital system is not detected and repaired appropriately. The safety and reliability analysis of safety critical systems can be accomplished with Markov modeling techniques which could express the dynamic and regenerative behavior of the digital control system. Certain states in the system represent system failure while others represent fault free behavior or correct operation in the presence of faults. This paper presents the development of a safety and reliability modeling of a digital feedwater control system using Markov based chain models. All the Markov states and the transitions between these states were assumed and calculated from the control logic for the digital control system. Finally based on the simulation results of modeling the digital feedwater control system the system does meet its reliability requirement with the probability of being in fully operational states is 0.99 over a 6 months time.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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