Redundancy
From CasGroup
(New page: '''Redundancy''' is related to duplication and replication and refers in general to the quality or state of being redundant, i.e. there are more components than needed to p...) |
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replacement ready to begin operating. | replacement ready to begin operating. | ||
| - | == TMR and NMR == | + | >== TMR and NMR == |
In engineering, redundancy means simply the duplication of critical components of a system with the intention of increasing reliability. In safety-critical systems, such as fly-by-wire aircraft, some parts of the control system may be triplicated. An error in one component then may then be out-voted by the other two. In a triply redundant system, the system has three sub components, all three of which must fail before the system fails. Since each one rarely fails, and the sub components are expected to fail independently, the probability of all three failing is calculated to be extremely small. | In engineering, redundancy means simply the duplication of critical components of a system with the intention of increasing reliability. In safety-critical systems, such as fly-by-wire aircraft, some parts of the control system may be triplicated. An error in one component then may then be out-voted by the other two. In a triply redundant system, the system has three sub components, all three of which must fail before the system fails. Since each one rarely fails, and the sub components are expected to fail independently, the probability of all three failing is calculated to be extremely small. | ||
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critical functions if all four computers fail. It can only be engaged manually by | critical functions if all four computers fail. It can only be engaged manually by | ||
crew action. | crew action. | ||
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== Hybrid Redundancy == | == Hybrid Redundancy == | ||
