The probabilistic models of the electrical, electronic and programmable electronic (E/E/PE)systems, which are proposed in the IEC 61508 and IEC 61511 standards, do not cover the uncertainty aspectsof results obtained from these models. The proposed method takes into consideration the sensitivity analysisof probabilistic models of E/E/PE systems as well as the uncertainty of probabilistic results. It uses differentialfactors, which are helpful for effective verification of required safety integrity level (SIL) of the E/E/PE systemstaking into account results of sensitivity analysis and/or assessment of uncertainty ranges obtained fromprobabilistic models developed. The uncertainty ranges of the probabilistic and risk measures for E/E/PE safetyrelatedsystems can be represented as intervals, in general fuzzy intervals, which are compared with the intervalprobabilistic criteria defined in the IEC 61508 standard, for four distinguished SILs. The determination andverification of SILs of the E/E/PE systems is performed using a prototype MySQL knowledge-based system.
Authors
Additional information
- Category
- Aktywność konferencyjna
- Type
- publikacja w wydawnictwie zbiorowym recenzowanym (także w materiałach konferencyjnych)
- Language
- angielski
- Publication year
- 2008
