Reliability Analysis of a N-Unit Series System with Delay Repair

In this paper, a n-unit series repairable system with delay repair is studied,assuming that the systematic unit's life has exponential distribution, the dalay repair time and the repair time both have general distribution,some primary reliabilities indexes are obtained by using renewal process theory, such as reliability R(t), availability A, the mean time to first failure MTTFF and the mean times to failure of the system during (0,t,etc.