A study of postponed replacement in a delay time model

Berrade, MD, Scarf, PA and Cavalcante, CAV 2017, 'A study of postponed replacement in a delay time model' , Reliability Engineering & System Safety .

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Abstract

We develop a delay time model for a one component system with postponed replacement to analyze situations in which maintenance might not be executed immediately upon discovery of a defect in the system. Reasons for postponement are numerous: to avoid production disruption or unnecessary or ineffective replacement; to prepare for replacement; to extend component life; to wait for an opportunity. This paper explores conditions that make postponement cost-effective. We are interested in modelling the reality in which a maintainer either prioritizes functional continuity or is not confident of the inspection test indicating a defective state. In some cases more frequent inspection and a longer time limit for postponement are recommended to take advantage of maintenance opportunities, characterized by their low cost, arising after a positive inspection. However, when the cost of failure increases, a significant reduction in the time limit of postponement interval is observed. The examples reveal that both the time to defect arrival and delay time have a significant effect upon the cost-effectiveness of maintenance at the limit of postponement. Also, more simply, we find that opportunities must occur frequently enough and inspection should be a high quality procedure to risk postponement.

Item Type: Article
Schools: Schools > Salford Business School > Salford Business School Research Centre
Journal or Publication Title: Reliability Engineering & System Safety
Publisher: Elsevier
ISSN: 0951-8320
Related URLs:
Depositing User: Dr Philip Scarf
Date Deposited: 19 Apr 2017 09:00
Last Modified: 08 Aug 2017 10:55
URI: http://usir.salford.ac.uk/id/eprint/42155

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