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Optimisation of wind turbine inspection intervals.

Andrawus, Jesse A.; Watson, John; Kishk, Mohammed; Gordon, Heather


Jesse A. Andrawus

John Watson

Mohammed Kishk

Heather Gordon


The choice of correct inspection intervals poses a serious challenge to industries that utilise physical assets. Too short an interval increases operational cost and waste production time while too long an interval increases the likelihood of unexpected asset failures. Failure Modes and Effect Criticality Analysis (FMECA) is a technique that permits qualitative evaluation of assets' functions to predict critical failure modes and the resultant consequences to determine appropriate maintenance tasks for the assets. The Delay-Time Maintenance Model (DTMM) is a quantitative maintenance optimisation technique that examines equipment failure patterns by taking into account failure consequences, inspection time and cost in order to determine optimum inspection interval. In this paper, a hybrid of FMECA and DTMM is used to assess the failure characteristics of a selected subsystems of a chosen wind turbine. Optimal inspection intervals for critical subsystems of the wind turbine are determined to minimise its total life-cycle cost.


ANDRAWUS, J.A., WATSON, J., KISHK, M. and GORDON, H. 2008. Optimisation of wind turbine inspection intervals. Wind engineering [online], 32(5), pages 477-490. Available from:

Journal Article Type Article
Acceptance Date Oct 1, 2008
Online Publication Date Oct 1, 2008
Publication Date Oct 31, 2008
Deposit Date Jun 10, 2014
Publicly Available Date Jun 10, 2014
Journal Wind engineering
Print ISSN 0309-524X
Electronic ISSN 2048-402X
Publisher SAGE Publications
Peer Reviewed Peer Reviewed
Volume 32
Issue 5
Pages 477-490
Keywords Wind turbine; Maintenance optimisation; Inspection interval; FMECA; Delay time model
Public URL


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