While multi blocks allow the analyst to represent multiple items with a single block in the RBD, BlockSim's mirrored blocks can be used to represent a single item with more than one block placed in multiple locations within the diagram. Mirrored blocks can be used to simulate bi-directional paths within a diagram. For example, in a reliability block diagram for a communications system where the lines can operate in two directions, the use of mirrored blocks will facilitate realistic simulations for the system maintainability and availability.
It may also be appropriate to use this type of block if the component performs more than one function and the failure to perform each function has a different reliability-wise impact on the system. In mirrored blocks, the duplicate block behaves in exactly the same way that the original block does. The failure times and all maintenance events are the same for each duplicate block as for the original block.
In the diagram shown in Figure 4.25, electricity can flow in both directions. Successful system operation requires at least one output (O1, O2 or O3) to be working.
Figure 4.25: Electrical network diagram.
Create a block diagram for this system.
The bi-directionality of this system can be modeled using mirrored blocks. The diagram is shown in Figure 4.26.
Figure 4.26: RBD of the network in Figure 4.25.
Blocks 5A, 7A and 1A are duplicates (or mirrored blocks) of 5, 7 and 1 respectively.
See Also:
RBDs and Analytical System Reliability
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