Dynamic Reliability Assessment Based on Ouroboros Paradigm

Dynamic reliability notions have gained popularity as an efficient indicator to assess performance degradation during system\´s life. Time dependent failure rates, as well as impact of operating constraints, cannot more be ignored to characterize service efficiency. By that way, this work aims, firstly to discuss factors influencing failure rates, and secondly, to develop a formal approach which integrates the effect of a system life factors into associated component. The first part of the paper attempts to transpose the conventional coupling model well fitted to "Ouroboros" paradigm to assess the reliability degradation due to aging and operating conditions. The second part of the paper is devoted to the risk of losing the service due to the too low reliability level of the involved components or maintenance tasks. A seaport for oil export validates the proposal. Hereby, connection components such as valves are involved in order to define an alignment. The reciprocal local-global dependency for reliability assessment is directly measurable on the alignment achievement. High level Petri nets have been used in one hand to compose this coupling paradigm, in the other hand to assess the dynamic reliability level for valves (local) and compute the risk of alignment lose (global).