Standby redundancy in reliability - a review

Yearout, Robert; Reddy, Prabhaker; Grosh, Doris Lloyd

doi:10.1109/tr.1986.4335434

Cited by 80 publications

(22 citation statements)

References 147 publications

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“…Rander et al (1992) and Singh et al (1986) discussed two unit cold standby concept considering various assumptions regarding failures, repairs, inspections and replacement. Yearout et al (1986) provide excellent review on standby redundancy.…”

Section: Literature Reviewmentioning

confidence: 99%

Comparative study of reliability parameter of a system under different types of distribution functions

Pathak¹,

Mehata²,

Sahu³

et al. 2014

Afr. J. Math. Comput. Sci. Res.

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In this paper a two unit standby system with single repair facility has been considered. When a working unit fails, it is immediately taken over by standby unit and repair on the failed unit is started immediately. Taking two types of distribution, namely, Weibull and Erlangian, various system effectiveness measures such as MTSF, Availability and Busy Periods are compared and results are interpreted numerically. Regenerative Point Technique and Semi-Markov process have been employed in this paper to find the results. Results are supported with numerical data also. Failure time distributions are taken to be exponential whereas the repair times are particular. The result obtained from this can be applied to study complex system where small change in the value of one variable affects the system measures to a great extent.

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Section: Literature Reviewmentioning

confidence: 99%

Comparative study of reliability parameter of a system under different types of distribution functions

Pathak¹,

Mehata²,

Sahu³

et al. 2014

Afr. J. Math. Comput. Sci. Res.

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“…This switching mechanism can be perfect or imperfect. In the case of perfect switching mechanism, two-unit standby repairable systems under di erent assumptions were extensively studied in the past [1][2][3][4][5][6]. Lewis [7] introduced the concept of imperfect or unreliable switching in standby systems.…”

Section: Introductionmentioning

confidence: 99%

Reliability analysis of a warm standby repairable system with two cases of imperfect switching mechanism

Sadeghi

Roghanian

2017

Scientia Iranica

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Abstract. This paper studies a warm standby repairable system including two dissimilar units: one repairman and imperfect switching mechanism. Times to failure and times to repair of active and standby units are assumed to be exponentially distributed. Two cases of unreliable switching mechanism are considered. In case one, the failed active unit will be replaced by the available warm standby unit with coverage probability c. However, in case two, the switching mechanism is repairable, and its failure time and repair time are also exponentially distributed. Using Markov process and Laplace transforms, the explicit expressions of the mean time to failure, MTTF, and the steady-state availability of the two systems are derived analytically. Finally, by solving a numerical example, the two systems are compared based on various reliability and availability characteristics. Moreover, sensitivity analyses of the reliability and availability indexes are accomplished with respect to the model parameters.

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“…As a result, the standby system models have been widely studied in the literature [1][2][3]. In case of cold standby systems most of the studies, [4][5], primarily focused only on the readiness of the unit in operation, despite of the fact that in a cold standby system the readiness of standby unit is equally important.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of a Stochastic System with Standby Failure and Maintenance

Bhardwaj¹,

Kaur²,

Malik³

2015

IJCA

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In industrial systems some components are kept in spare to cope up with the failures of operating components. The failure of these spares too, significantly affects the functioning and outputs of the system. The current paper investigates a semiMarkov model for a redundant system consisting of two identical units and a repair facility. The system starts operating with one unit in operation and remaining in redundancy mode. The failure rate of unit in redundancy is zero, initially. After crossing a pre specified time the redundant unit is expected to fail and thereafter it goes under inspection to check feasibility of maintenance or replacement so that necessary remedial action can be taken. Under this framework the expressions for various measures of system performance are derived exploring the regenerative point technique of renewal theory. A numerical example, for a particular case, illustrates the practical importance of the study graphically.

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Standby redundancy in reliability - a review

Cited by 80 publications

References 147 publications

Comparative study of reliability parameter of a system under different types of distribution functions

Comparative study of reliability parameter of a system under different types of distribution functions

Reliability analysis of a warm standby repairable system with two cases of imperfect switching mechanism

Performance Analysis of a Stochastic System with Standby Failure and Maintenance

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