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Model-based displacement estimation of wind turbine blades using strainmodal data

Gundlach, Janto and Knebusch, Johannes and Govers, Yves and Haller, Bernd (2020) Model-based displacement estimation of wind turbine blades using strainmodal data. Journal of Physics: Conference Series, 1618 (052069). Institute of Physics (IOP) Publishing. doi: 10.1088/1742-6596/1618/5/052069. ISSN 1742-6588.

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Official URL: https://iopscience.iop.org/article/10.1088/1742-6596/1618/5/052069


For wind turbine rotor blades, the use of strain sensors is preferred over acceleration sensors for the purpose of permanent monitoring. Experimental modal analysis during operation is thus constrained to strain information, yielding strain modal data including strain mode shapes. For follow-up investigations such as aerodynamic load assessment or flutter monitoring it is however advantageous to have this information as displacement mode shapes or as displacements of the blade contour over time. This research applies a generic approach that converts strain mode shapes to displacement mode shapes utilizing an FE shell model as a basis for approximation. The accuracy of the approach is assessed by comparison with experimentally identified high-resolution displacement mode shapes which are acquired with accelerometers and serve as a reference. In the process the conversion procedure is illustrated with the help of strain data that has been obtained using a sensor instrumentation installed for certification testing of the blade. The requirements for successful usage of the employed conversion scheme and its suitability for rotor blade data are discussed.

Item URL in elib:https://elib.dlr.de/136293/
Document Type:Article
Title:Model-based displacement estimation of wind turbine blades using strainmodal data
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Gundlach, JantoJanto.Gundlach (at) dlr.dehttps://orcid.org/0000-0002-7933-4913
Knebusch, JohannesJohannes.Knebusch (at) dlr.deUNSPECIFIED
Govers, YvesYves.Govers (at) dlr.dehttps://orcid.org/0000-0003-2236-596X
Haller, Berndbernd.haller (at) iwes.fraunhofer.deUNSPECIFIED
Date:22 September 2020
Journal or Publication Title:Journal of Physics: Conference Series
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:No
DOI :10.1088/1742-6596/1618/5/052069
Publisher:Institute of Physics (IOP) Publishing
Keywords:experimental strain modal analysis, wind turbine rotor blades, strain to displacement conversion
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: Gundlach, Janto
Deposited On:12 Oct 2020 16:16
Last Modified:12 Oct 2020 16:16

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