Author(s)

Satu Kärki & Juhani Hyvärinen

Abstract

Information concerning a fault in a process can be broken down to components using a tree diagram where a so-called major event forms the root of the diagram and the reasons, contributing to the event taking place, form the branches of the tree. The tree diagram and sets of symptoms can be combined relatively easily in order to make it possible to handle both top-down and bottom-up approaches in the reasoning process. A fault tree consists of a hierarchical structure in which one fault can explain one or several faults on a lower level. A set of symptoms can be used for indicating that a specific fault has occured. In this paper, the implementation of a fault tree as a basis of a fault diagnosis system is discussed. General requirements for the

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