Abstract

AbstractThe degree of reliability is analyzed for the case where the preventive maintenance is applied to a parallel redundant system with two mutually related and repairable units. The bivariate exponential distribution (BVE) is introduced to describe the failure time distribution of two units that are not independent and mutually related. The reliability analysis of a repairable two‐unit parallel redundant system assuming a BVE failure distribution has already been reported. In this report, two methods of preventive maintenance are considered in the system with the BVE failure distribution. (1) Mutually related preventive maintenance is applied to the system only when both units obey the BVE distribution in failure time distribution. (2) Simultaneous preventive maintenance is applied to two units at prescheduled times. In the reliability analysis, the limiting availability of the system is calculated by using an extended regeneration point method in Markov renewal processes (MRP). In numerical examples, actual figures are assigned to each distribution and the time ratio of preventive maintenance for the two units is defined. Then the relationship between variations of the time ratios and the limiting availability is shown.

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