ABSTRACT

The corrective action in this case consists of three phases—cooling of initial core process, suppression core cooling, and removal of residual heat. Computer processing units, communication satellites, and satellite launchers are other examples of PM systems. All complex systems can be considered as a collection of subsystems where each subsystem does its designated job. An automobile consists of several mechanical, electrical, and automated subsystems. In reliability engineering, it is extremely important that the system performs its task satisfactorily. Many methods have been devised for finding the reliability of PM systems. The reliability estimation of phase-type systems when the subsystems consist of components in a parallel network with observable or unobservable operational times has been discussed in detail by Rani, Dewan, and Jain and Rani, Jain, and Dewan. The maximum likelihood estimation of parameter λ is discussed when the subsystem operational times are unobservable.