Paper Info
Title
An opportunistic condition-based maintenance policy for offshore wind turbine blades subjected to degradation and environmental shocks
Abstract
Offshore wind turbine blades are subject to multiple types of internal and external damages. Internal damages (such as fatigue, wear and cracks) are generally caused by system degradation, whereas the external damages (such as icing, wind and wave shocks) result from harsh marine environments. In this paper, we investigate an optimal opportunistic condition-based maintenance (OCBM) policy for a multi-bladed offshore wind turbine system subjected to stress corrosion cracking (SCC) and environmental shocks. When the length of a crack in a blade reaches critical size D, the blade breaks and it has to be replaced by a new one. An environmental shock is minor with probability 1−p and catastrophic with probability p (0≤p≤1). A minor shock causes an instant drop in power output without resulting in any system failure, whereas a catastrophic shock stops the wind turbine and requires system replacement. When the length of a crack in one of the blades exceeds a threshold d (<D), it undergoes a major repair and a preventive maintenance (PM) action is performed on the other blade(s); otherwise, a planned PM task is conducted for the whole system when its operational age attains a value of T (>0). The problem is to simultaneously determine the optimal control parameters d⁎ and T⁎ such that the average long-run maintenance cost per blade per unit time is minimized. The explicit expression of the objective function is derived and under certain conditions, the existence and uniqueness of the optimal solution are shown for the infinite-horizon case. The proposed maintenance model is tested on a three-bladed wind turbine and its performance over the system life cycle is evaluated using a Monte-Carlo simulation technique.
Year
DOI
Venue
2015
10.1016/j.ress.2015.05.001
Reliability Engineering & System Safety
Keywords
Field
DocType
Opportunistic maintenance,Condition-based maintenance,Degradation,Environmental shock,Offshore wind energy
Icing,Condition-based maintenance,Optimal control,Damages,Turbine blade,Offshore wind power,Turbine,Stress corrosion cracking,Engineering,Marine engineering,Structural engineering
Journal
Volume
ISSN
Citations 
142
0951-8320
19
PageRank 
References 
Authors
0.70
10
3
Name
Order
Citations
PageRank
Mahmood Shafiee1806.96
Maxim Finkelstein223341.24
Christophe Bérenguer326219.23