Optimization of alarm threshold and sequential inspection scheme

An item is subject to gradual degradation. The degradation can be represented by a measurable, non-negative and non-decreasing quantity. The item can be in one of three different states: normal (when the degradation quantity is smaller than a threshold of alarm or potential failure), functional fail...

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Bibliographic Details
Published in:Reliability engineering & system safety 2010-03, Vol.95 (3), p.208-215
Main Author: Jiang, R.
Format: Article
Language:English
Subjects:
Applied sciences
Condition-based maintenance
Decision theory. Utility theory
Exact sciences and technology
General path model
Increment process model
Offline decision model
Online decision model
Operational research and scientific management
Operational research. Management science
Reliability theory. Replacement problems
Sequential inspection scheme
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Summary:An item is subject to gradual degradation. The degradation can be represented by a measurable, non-negative and non-decreasing quantity. The item can be in one of three different states: normal (when the degradation quantity is smaller than a threshold of alarm or potential failure), functional failure (when the degradation quantity is larger than a functional failure threshold) and in-between or potential failure (when the degradation quantity is larger than the alarm threshold and smaller than the functional failure threshold). A sequential inspection scheme is implemented to determine the state of the item so as to prevent a functional failure. The paper presents a flexible degradation model and two cost models to optimize the alarm threshold and the sequential inspection scheme. The usefulness and appropriateness of the proposed models are illustrated by examples.
ISSN:0951-8320
1879-0836
DOI:10.1016/j.ress.2009.09.012