Any subdiagrams and multi blocks that may be present in the BlockSim RBD are expanded and/or merged into a single diagram before the system is simulated. As an example, consider the system shown in Figure 8.40.
Figure 8.40: A system made up of three subsystems, A, B and C. Figure 8.37 illustrates the simulation engine view of this system.
BlockSim will internally merge the system into a single diagram before
the simulation, as shown in Figure 8.41. This means that all the failure
and repair properties of the items in the subdiagrams are also considered.
Figure 8.41: The simulation engine view of the system and subdiagrams shown in Figure 8.36.
If a subdiagram represents a line replaceable item, such as a circuit board that was swapped out during repair, and one does not wish to model the time that it takes to repair/replace components inside the circuit board, then the failure distribution should be obtained for the subdiagram (using the component properties) and individual repair properties should be added at the subdiagram level. Figure 8.42 illustrates this option in the BlockSim Block Properties window.
Figure 8.42: Subdiagram properties in BlockSim.
In the case of multi blocks, the blocks are also fully expanded before simulation. This means that unlike the analytical solution, the execution speed (and memory requirements) for a multi block representing ten blocks in series is identical to the representation of ten individual blocks in series.
See Also:
Repairable Systems Analysis Through Simulation
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