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对安全仪表系统(SIS)的功能结构、安全生命周期以及功能安全的实现方法进行了分析,并提出了基于马尔可夫(Markov)建模的SIS的安全完整性等级计算软件的设计方案,采用VB6.0和Matlab进行了软件的开发实现。我们针对1oo2冗余结构的装置进行了SIL的计算,证明马尔可夫建模方法的安全完整性等级(SIL)计算相对于其他建模方法的灵活性。它既能反映安全仪表系统之间的静态关系,又能反应系统的动态变化,并且不受设备之间依赖关系的影响。同时马尔可夫建模可靠性的定量分析精度高,一次建模可求得安全仪表系统的安全失效率PFS和危险失效率PFD和安全完整性等级SIL等多个可靠性指标。
The functional structure of safety instrumented system (SIS), safety life cycle and the realization of functional safety are analyzed, and the design scheme of SIS safety integrity level calculation software based on Markov modeling is proposed. VB6.0 and Matlab software development and implementation. We performed a SIL calculation for a 1oo2 redundant architecture to demonstrate the flexibility of the Mark of Safety Integrity Level (SIL) for Markov modeling over other modeling methods. It not only reflects the static relationship between safety instrumented systems, but also reflects the dynamic changes in the system, and independent of the dependence between devices. At the same time, the accuracy of Markov modeling reliability is high. Multiple reliability indexes such as safety failure probability (PFS), dangerous failure probability (PFD) and safety integrity level (SIL) can be obtained through one-time modeling.