A. Bobbio Reggio Emilia, June 17-18 , 2003 1 Dependability & Maintainability Theory and Methods 3. Reliability Block Diagrams Andrea Bobbio Dipartimento di Informatica Università del Piemonte Orientale, “A. Avogadro” 15100 Alessandria (Italy) bobbio @ unipmn .it - http://www.mfn.unipmn.it/~bobbio/IFOA IFOA, Reggio Emilia, June 17-18, 2003
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A. BobbioReggio Emilia, June 17-18, 20031 Dependability & Maintainability Theory and Methods 3. Reliability Block Diagrams Andrea Bobbio Dipartimento di.
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A. Bobbio Reggio Emilia, June 17-18, 2003 1
Dependability & Maintainability Theory and Methods
Model Types in DependabilityModel Types in DependabilityCombinatorial models assume that components are statistically independent: poor modeling power coupled with high analytical tractability.
Reliability Block Diagrams, FT, ….
State-space models rely on the specification of the whole set of possible states of the system and of the possible transitions among them.
CTMC, Petri nets, ….
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Reliability Block Diagrams
Each component of the system is represented as a block;
System behavior is represented by connecting the blocks;
Failures of individual components are assumed to be independent;
Combinatorial (non-state space) model type.
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Reliability Block Diagrams (RBDs)
Schematic representation or model;Shows reliability structure (logic) of a system;Can be used to determine dependability measures;A block can be viewed as a “switch” that is
“closed” when the block is operating and “open” when the block is failed;
System is operational if a path of “closed switches” is found from the input to the output of the diagram.
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Reliability Block Diagrams (RBDs)Can be used to calculate: