Alberti, A, Cavalcante, CAV, Scarf, PA 
ORCID: https://orcid.org/0000-0001-5623-906X and Silva, ALO
2018,
'Modelling inspection and replacement quality for a protection system'
, Reliability Engineering & System Safety, 176
, pp. 145-153.
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Abstract
An inspection and replacement policy for a protection system is described by a mathematical model that incorporates multiple aspects of maintenance quality. A three-state component failure model is assumed, with a defective state preceding failure. The quality of maintenance intervention is modelled by supposing that inspections may misclassify defects (false positives and false negatives) and further that an inspection may induce a defect. The quality of replacement is modelled by supposing that a component arises from a heterogeneous population, composed of weak and strong items and with the mixing parameter determining quality. Isolation valves used in water distribution systems motivate the model development, and a case study is considered in this context. We evaluate the impact of these aspects of the quality of maintenance upon cost and production losses. Defect induction is found to be a key determinant of the cost-optimal policy. The proposed model allows us to verify conditions that justify investment in higher quality maintenance, and thus to provide guidance for prioritization of this investment.
| 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: | 09 Apr 2018 09:15 |
| Last Modified: | 07 Apr 2020 08:01 |
| URI: | http://usir.salford.ac.uk/id/eprint/46607 |
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