Probabilistic Criterion for Evaluation of the Dependability of Critical Electrotechnical Systems
Abstract
Abstract. In the paper, a probabilistic methodology for the quantitative evaluation of the dependability of critical electrotechnical systems operating under destructive impacts is proposed. It is shown that traditional reliability and availability indicators are insufficient for describing system conduct under partial degradation, complete loss of operability, and subsequent recovery processes.
Dependability is interpreted as an integral probabilistic property reflecting a system’s ability to retain and restore critical functions under adverse conditions. A state-based Markov model is applied to describe the evolution of the functional state through a finite set of functional states and probabilistic transitions. Within this framework, dependability is characterized by three complementary probabilistic components: retention of full operability under destructive impact, recovery after partial loss of functionality, and recovery after complete loss of operability.
On this basis, a normalized integral dependability criterion bounded within the interval [0;1] is proposed using weighted aggregation of the probability components. The proposed approach provides a rigorous and flexible tool for comparative analysis and evaluation of critical electrotechnical systems with respect to resilience and recoverability.
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