Probabilistic safety analysis of maintainable systems

摘要

This paper presents two mathematical models to perform probabilistic safety analysis in maintenance environment.Both models assume system operating in safe and unsafe environments.Model I represents a repairable system with three states:working normally,working in unsafe mode,and failed safely.Model II represents a repairable system with four states:working normally,workig in unsafe mode due to human error,working in unsafe mode due to hardware failure,and failed safely.Equations for state probabilities,system availabilities,reliability,and mean time to failure are developed.