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On the basic concepts of safety engineering

Rakowsky U. K.

Journal of Polish Safety and Reliability Association

2015

Vol. 6, No. 2

107--116

The basic concepts of safety engineering and functional safety frameworks are presented and discussed in this paper. The scope includes safety aspects, which are deeply rooted in philosophy e.g. the principles of causality, determinability, and randomness. Moreover, concepts are presented, which are subject of standardisation, engineering association activities, and aspects, practitioners struggling with in daily business, e.g. failure and fault; architecture and structure; redundancy and channels. The paper closes with a brief glance on engineering ethics.

On the prognosis of failure coincidences in multi-system scenarios

Rakowsky U. K.

Journal of Polish Safety and Reliability Association

2010

Vol. 1, No. 1

203--214

The objective of the approach is to calculate the probability of failure coincidences or maintenance conflicts, respectively, in an n-system-single-maintenance-unit scenario. Beside the operation of conventional systems, reliability-adaptive systems can be considered as well in this scenario. The approach applies multiple integrals over probability density functions, which are arranged Matryoshka-like. The contribution discusses permutations of coincidence patterns explicitly and general coincidence probabilities. So-called staple graph and staple graph coincidence permutation diagrams are introduced as graphical representations.

Fundamentals of the Dempster-Shafer theory and its applications to system safety and reliability modelling

Rakowsky U. K.

Journal of Polish Safety and Reliability Association

2007

Vol. 2

283--295

The Dempster-Shafter Theory is well-known for its usefulness to express uncertain judgments of experts. This contribution shows how to apply the calculus to safety and reliability modelling, especially to expert judgement; Failure Modes, Effects, and Criticality Analysis; Event Tree Analysis, Fault Tree Analysis, and Reliability Centred Maintenance. Including a tutorial introduction to the Dempster-Shafer Theory, the differences between the Probability and the Dempster-Shafer Theory are discussed widely.