A k-out-of-n reliability system with an unreliable server and phase type repairs and services: the (N, T) policy. (2001)

• Record Type: Journal Article
• Authors: Chakravarthy, Srinivas R.; Krishnamoorthy, A.; Ushakumari, P. V.
• Is Part Of: Journal of applied mathematics and stochastic analysis. Volume 14:Number 4(2001)
• Page Start: 361
• Page End: 380
• Publication Date: 2001
• Subjects: reliability system -- k-out-of-n system -- ({N, T})-policy -- phase type distribution -- matrix-analytic methods -- algorithmic probability -- and optimization; Mathematical models -- Periodicals; Computer simulation -- Periodicals; Computer science -- Mathematics -- Periodicals; Computer science -- Mathematics; Computer simulation; Mathematical models; Applied Mathematics; Periodicals; Electronic journals; 519.22
• DOI: 10.1155/S1048953301000326
• Languages: English
• ISSNs: 1048-9533

Abstract

Abstract : In this paper we study a k -out-of-n reliability system in which a single unreliable server maintains n identical components. The reliability system is studied under the ( N, T ) policy. An idle server takes a vacation for a random amount of time T and then attends to any failed component waiting in line upon completion of the vacation. The vacationing server is recalled instantaneously upon the failure of the N t h component. The failure times of the components are assumed to follow an exponential distribution. The server is subject to failure with failure times exponentially distributed. Repair times of the component, fixing times of the server, and vacationing times of the server are assumed to be of phase type. Using matrix-analytic methods we perform steady state analysis of this model. Time spent by a failed component in service, total time in the repair facility, vacation time of the server, non-vacation time of the server, and time until failure of the system are all shown to be of phase type. Several performance measures are evaluated. Illustrative numerical examples are presented.