Metodi statistici per la misura della disponibilità operativa di un sistema
Wednesday 23rd December 2009
Availability is the probability of an item to be operable and committable when used in xed operating conditions; it is a widely used parameter to estimate the quality of a system. This work comes from a theme proposed by Altran Italy, about a posteriori evaluation of the operating availability for complex systems using statistical models, in order to conrm or not a priori analytical results. Then, we introduce an innovative approach to the model, based on Hidden Markov Models (HMM). In Chapter 1 we present the problem from an engineeristic point of view; Chapter 2 provides a presentation of dierent statistical models presented in literature and a comparison between them; in Chapter 3 we introduce HMM and apply them to this problem; in Chapter 4 we compare the models of Chapter 2 with HMM; Chapter 5 provides a conclusion.