Fault Trees Sample Clauses

Fault Trees. Δ A fault tree ‘ ’ is a directed acyclic graph that models how component failures propagate and eventually cause the full system to fail. The leaves are called basic elements (or basic events), and model the failure of elemental components. Other nodes called intermediate events are labelled with gates, and describe how combi- nations of lower failures propagate to upper levels. A full-system failure is called a top level event (tle), and takes place when the root node of the tree fails. In this work we consider the repairable dynamic fault trees (rfts) presented in [8, 19]. Thus, each basic element (BE) b is equipped with a failure distribution Fb that governs its failure probability as a function of time, and a repair distri- bution Rb that governs its repair time. Some BEs are used as spare components: these (SBEs) replace a primary component when it fails. The dormancy distri- bution Db of an SBE b describes its failure while dormant, i.e. not in use. Only if b becomes active its failure distribution is given by Fb.
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