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- W834603211 abstract "This thesis looks into ways of developing a new approach for fault tree automation.Initially an extensive literature survey was undertaken to try and identify if anymethods contained useful features that might warrant further development. The twomethods that were chosen were the decision table method and the digraph method.The new hybrid method is based on the flexibility of the decision table method butincorporates a way of detecting, classifying and analysing control loops, similar to theuse of operators in the digraph approach. As well as using operators to deal withcontrol loops new operators are introduced that deal with current and no current inelectrical circuits. These new operators have been developed to be able to handlecomponents that are common to multiple circuits. The advantages of applyingoperators during fault tree construction is to reduce the number of repeated andinconsistent events that may occur in the tree, and to significantly reduced the size ofthe constructed fault tree. Thus producing a tree logic that can easily be followed byan analyst and is in an appropriate format for direct input to an fault tree analysis code.The new method has been automated and successfully applied to three railway safetysystems obtained from London Underground Ltd. To test the ability of the AutomaticFault Tree Construction Code (AFTCC) the complexity of each of the three systemsincreased. The first system, the Train Stop system, did not contain any circuits; thesecond, the Train Detection system, contained simple circuits and lastly the TrainBraking system, contained multiple nested circuits." @default.
- W834603211 created "2016-06-24" @default.
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- W834603211 date "1996-01-01" @default.
- W834603211 modified "2023-09-27" @default.
- W834603211 title "Automatic fault tree construction for railway safety systems" @default.
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