Reliability Block Diagram Analysis
Reliability block diagrams (RBDs) are based on a top-down model similar to FTA. However, instead of the result being a failure, the result is a success. The top event is a successful event such as a service being available. The model depicts the successful components and their relationships to achieve top event success. Removal of a block is equivalent to a loss of the success path represented by that block. The focus is on describing all success paths through the system.
The relationships are mapped as serial and parallel connections of the blocks. Redundant components are shown connected in parallel, similar to the AND gate in the FTA. Dependent components are shown connected serially, similar to the OR gate ...
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