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A systematic investigation of common gradient based model updating approaches applied to high-fidelity test-data of a wind turbine rotor blade

Knebusch, Johannes and Gundlach, Janto and Govers, Yves (2020) A systematic investigation of common gradient based model updating approaches applied to high-fidelity test-data of a wind turbine rotor blade. In: Proceedings of the XI International Conference on Structural Dynamics, pp. 2159-2174. EASD Procedia. EURODYN 2020 - XI International Conference on Structural Dynamics, 23.-26. Nov. 2020, Athens, Greece (Online). doi: 10.47964/1120.9175.19508. ISBN 978-618-85072-2-7. ISSN 23119020.

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Official URL: http://dx.doi.org/10.47964/1120.9175.19508

Abstract

Within the context of the "SmartBlades2"-project, a wind turbine rotor blade was designed and extensively tested. The rotor-blade uses a lightweight composite structure and bend-twist coupling. The bend-twist coupling facilitates a passive load-reduction by changing the angle of attack under load. Due to a high sensor-density of 265 accelerometers in the experimental modal test of the blade, the sophisticated structural dynamics of the model are captured. Apart from the commonly measured first flapwise-, edgewise-bending and torsion mode, 35 modes up to a frequency of 60 Hz are identified. Unlike in many other wind turbine rotor blade investigations, the Finite Element (FE) model uses shell elements instead of beam elements and is directly based on production drawings. This experimental and simulative setup is particularly relevant, since a significant number of mode shapes exhibit a distinct local behavior which was in previous studies not accounted for. The differences between experimental and simulated results are minimized using computational model updating procedures. In this case-study, two formerly underrepresented aspects of the updating of large-scale FE models are examined. One is the use of different parameterizations and the other is the possibility of insufficient experimental data. The parametrizations are based on well-established criteria like error-localization and sensitivity. Moreover, the updating is performed with different (i.e. reduced) subsets of the modal data and the results are then compared to the model updating results achieved with the entire dataset. This in-depth investigation of the model updating of a composite structure allows the deduction of general guidelines in the model updating of industrial-sized FE models.

Item URL in elib:https://elib.dlr.de/139913/
Document Type:Conference or Workshop Item (Speech)
Title:A systematic investigation of common gradient based model updating approaches applied to high-fidelity test-data of a wind turbine rotor blade
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Knebusch, JohannesJohannes.Knebusch (at) dlr.dehttps://orcid.org/0000-0001-9180-9638
Gundlach, JantoJanto.Gundlach (at) dlr.dehttps://orcid.org/0000-0002-7933-4913
Govers, YvesYves.Govers (at) dlr.dehttps://orcid.org/0000-0003-2236-596X
Date:November 2020
Journal or Publication Title:Proceedings of the XI International Conference on Structural Dynamics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.47964/1120.9175.19508
Page Range:pp. 2159-2174
Editors:
EditorsEmailEditor's ORCID iD
Papadrakakis, MNational Technical University of Athens, GreeceUNSPECIFIED
Fragiadakis, MNational Technical University of Athens, GreeceUNSPECIFIED
Papadimitriou, ConstantinosUniversity of Thessaly, GreeceUNSPECIFIED
Publisher:EASD Procedia
Series Name:Dynamics of on- and off-shore wind energy structures (WES)
ISSN:23119020
ISBN:978-618-85072-2-7
Status:Published
Keywords:windenergy, rotorblade, high-fidelity, model updating
Event Title:EURODYN 2020 - XI International Conference on Structural Dynamics
Event Location:Athens, Greece (Online)
Event Type:international Conference
Event Dates:23.-26. Nov. 2020
Organizer:EASD - European Association for Structural Dynamics
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Wind Energy
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Wind Energy (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Structural Dynamics and System Identification
Deposited By: Knebusch, Johannes
Deposited On:23 Dec 2020 10:26
Last Modified:23 Dec 2020 12:10

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