Vibration-based structural health monitoring of a wind turbine system Part II : Environmental/operational effects on dynamic properties
(2015) In Engineering Structures 89. p.273-290- Abstract
The second part of these companion papers mainly researches environmental/operational influences on structural dynamic properties under normal operational conditions during two years, in order to extract a statistical based damage-sensitive indicator for health monitoring of a wind turbine system. The correlation analyses between experimental identified frequencies, damping values as well as mode shapes and environmental/operational factors such as rotation speed of blades, wind speed, pitch angle, temperature and nacelle direction are presented. It is observed that the frequency estimates are influenced by the nacelle position, the activation of rotor, the rotation speed of blades and the wind speed as well as the temperature.... (More)
The second part of these companion papers mainly researches environmental/operational influences on structural dynamic properties under normal operational conditions during two years, in order to extract a statistical based damage-sensitive indicator for health monitoring of a wind turbine system. The correlation analyses between experimental identified frequencies, damping values as well as mode shapes and environmental/operational factors such as rotation speed of blades, wind speed, pitch angle, temperature and nacelle direction are presented. It is observed that the frequency estimates are influenced by the nacelle position, the activation of rotor, the rotation speed of blades and the wind speed as well as the temperature. Regarding to the damping estimates, they are mainly associated with variation of the aerodynamic damping due to the increasing wind speed. Besides, the resonance phenomenon is also observed in higher modes. The harmonic frequencies due to blades passing by tower are found and the corresponding damping value decreases. Moreover, the mode shapes in some modes are strongly affected by the position of the nacelle. Subsequently, two types of simulated damage including the reduction of stiffness in both the rotor blade and the tubular tower are successfully detected by applying the Principal Component Analysis (PCA) based methods to these temperature-sensitive frequency estimates. Comparison of change of the extracted health features indicates that they are more sensitive with the tower damage.
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- author
- Hu, Wei Hua ; Thöns, Sebastian LU ; Rohrmann, Rolf Günter ; Said, Samir and Rücker, Werner
- publishing date
- 2015-04-05
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Damage detection, Environmental/operational effects, Modal properties, Novelty analysis, Principal Component Analysis, Structural health monitoring, Vibration, Wind turbine
- in
- Engineering Structures
- volume
- 89
- pages
- 18 pages
- publisher
- Elsevier
- external identifiers
-
- scopus:84925182367
- ISSN
- 0141-0296
- DOI
- 10.1016/j.engstruct.2014.12.035
- language
- English
- LU publication?
- no
- id
- 50ab91e9-faf9-403d-a00a-dafd9882cc08
- date added to LUP
- 2020-09-09 10:10:50
- date last changed
- 2022-04-03 04:48:04
@article{50ab91e9-faf9-403d-a00a-dafd9882cc08,
abstract = {{<p>The second part of these companion papers mainly researches environmental/operational influences on structural dynamic properties under normal operational conditions during two years, in order to extract a statistical based damage-sensitive indicator for health monitoring of a wind turbine system. The correlation analyses between experimental identified frequencies, damping values as well as mode shapes and environmental/operational factors such as rotation speed of blades, wind speed, pitch angle, temperature and nacelle direction are presented. It is observed that the frequency estimates are influenced by the nacelle position, the activation of rotor, the rotation speed of blades and the wind speed as well as the temperature. Regarding to the damping estimates, they are mainly associated with variation of the aerodynamic damping due to the increasing wind speed. Besides, the resonance phenomenon is also observed in higher modes. The harmonic frequencies due to blades passing by tower are found and the corresponding damping value decreases. Moreover, the mode shapes in some modes are strongly affected by the position of the nacelle. Subsequently, two types of simulated damage including the reduction of stiffness in both the rotor blade and the tubular tower are successfully detected by applying the Principal Component Analysis (PCA) based methods to these temperature-sensitive frequency estimates. Comparison of change of the extracted health features indicates that they are more sensitive with the tower damage.</p>}},
author = {{Hu, Wei Hua and Thöns, Sebastian and Rohrmann, Rolf Günter and Said, Samir and Rücker, Werner}},
issn = {{0141-0296}},
keywords = {{Damage detection; Environmental/operational effects; Modal properties; Novelty analysis; Principal Component Analysis; Structural health monitoring; Vibration; Wind turbine}},
language = {{eng}},
month = {{04}},
pages = {{273--290}},
publisher = {{Elsevier}},
series = {{Engineering Structures}},
title = {{Vibration-based structural health monitoring of a wind turbine system Part II : Environmental/operational effects on dynamic properties}},
url = {{http://dx.doi.org/10.1016/j.engstruct.2014.12.035}},
doi = {{10.1016/j.engstruct.2014.12.035}},
volume = {{89}},
year = {{2015}},
}