A fault tree cannot normally represent a complex RBD. As an example, consider the RBD shown in Figure 10.41.
Figure 10.41: A complex RBD that cannot be represented by a fault tree unless duplicate events are used.
A fault tree representation for this RBD is shown in Figure 10.42. Note that the same event is used more than once in the fault tree diagram. To correctly analyze this, the duplicate events need to be set up as "mirrored" events to the parent event. In other words, the same event is represented in two locations in the fault tree diagram. It should be pointed out that the RBD in Figure 10.43 is also equivalent to the RBD of Figure 10.41 and the fault tree of Figure 10.42.
Figure 10.42: A fault tree representation using mirrored blocks (events) of the complex RBD shown in Figure 10.41.
Figure 10.43: An RBD using mirrored blocks that is equivalent to both the RBD and FTD of Figures 10.41 and 10.42.
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