A semiautomatic method for qualitative failure mode analysis

J.R. Taylor

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    Modern control systems are becoming increasingly complex. If failure mechanisms and effect are known, it is often sinple to make small design changes, which lead to fail safe design. The problem is to discover the large number of different failure possibilities.

    The cause/consequence diagram provides a good way of describing the sequential effects in a failure, imprtant in control systems. Production of cause/consequences diagrams is at present a skilled manual task.

    A method is presented for producing cause/consequence diagrams automatically, starting with block diagram of the system to be analysed and equations describing the operation of each component, undernormal and failure conditions. Theorem providing techniques are used to deduce the sequence of events occuring after a failure.

    The method makes it possible to define what is meant by a "complete" failure analysis. In practice, it seems that such "complete" analyses require a large amount of computer time. Human interaction helps in avoiding unnecessarily detailed analysis, and in increasing efficiency of the analyses.
    Original languageEnglish
    Place of PublicationRoskilde, Denmark
    PublisherRisø National Laboratory
    Number of pages20
    Publication statusPublished - 1974


    • Risø-M-1707


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