Reliability analysis of two-unit cold standby repairable system with replaceable repaired facilities and delay in repair

It was presumed for a cold standby repairable system of two identical units with replaceable repaired facilitics and delay in repair that the service life of the facilities followed the exponent distribution pattern,the delay in repair and repair time of the repaired facilities after their failure happening—ordinary distribution pattern,the service life of repaired facilities—exponential distribution pattern,and the replacing or repairing time of repaired facilities after their failure—ordinary distribution pattern.By using renewal process theory of Markov,some reliability indices of the repaired facilities were obtained.