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RELIABILITY COMPARISON OF TWO UNIT REDUNDANCY SYSTEMS UNDER THE LOAD REQUIREMENT

Published online by Cambridge University Press:  04 May 2020

Kyungmee O. Kim Open the ORCID record for Kyungmee O. Kim [Opens in a new window]
Kyungmee O. Kim*
Affiliation:
Department of Industrial Engineering, Konkuk University, Seoul 143-701, Korea E-mail: [email protected]
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Abstract

This paper compares the reliability functions of the cold standby, hot standby, and load-sharing redundancy configurations, each of which is composed of two identical components for meeting a given system requirement. Thus far, no research has been done into the conditions that make one configuration more reliable than another because their reliability functions have no closed forms even when the component follows a Weibull lifetime distribution. In this paper, two analytical results are obtained given that the reliability of each configuration is expressed in terms of the design and operational loads of the component. First, higher reliability can be achieved in a cold standby configuration than in a load-sharing configuration if the increase in the component reliability obtained from the reduction in the operational load is not significant. Second, a cold standby configuration exhibits better reliability and carries a higher load than a hot standby configuration if the design load can be increased with a less decrease in the component reliability.

Keywords

cold standbyhot standbyload-sharingstep-stress model
Type
Research Article
Information
Probability in the Engineering and Informational Sciences , Volume 35 , Issue 3 , July 2021 , pp. 766 - 780
Copyright
© Cambridge University Press 2020

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