Reliability Calculations
The system reliability value is calculated using both the system configuration specified in the block diagram and the failure distribution specified in the calculation properties for the blocks. If all blocks are in series, and all of them follow exponential failure distributions, then the system itself follows an exponential failure distribution, and the failure rate is the sum of the failure rates of its components.
The following table describes how Account for repair in reliability affects the calculation of reliability. This checkbox appears on the General page under RBD in the Calculate window. For more information, see General Page.
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Type
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Description
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Reliability without repair
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When Account for repair in reliability is cleared, the reliability calculations for the system do not take the corrective maintenance information for the individual components into account. All components are calculated as if they did not have any corrective maintenance. For more information, see Reliability Without Repair.
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Reliability with repair
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When Account for repair in reliability is selected, the reliability calculations for a system do take the corrective maintenance information for the individual components into account. However, once the system fails, repairs cannot be performed on the system. In other words, while calculating reliability with repair, the effects of repairs of components, and hence the system, are not considered once the system reaches a failed state. It should be noted that for a system with non-repairable components, the reliability calculations with and without repair are the same. For more information, see Reliability With Repair.
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When the reliability of a block with a duty cycle percentage is calculated, its reliability equation is modified. For more information, see Reliability with Duty Cycle Percentage.
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