Print Email Facebook Twitter Damping identification of offshore wind turbines using operational modal analysis Title Damping identification of offshore wind turbines using operational modal analysis: a review Author van Vondelen, A.A.W. (TU Delft Team Jan-Willem van Wingerden) Navalkar, S.T. (TU Delft Team Jan-Willem van Wingerden; Siemens Gamesa Renewable Energy) Iliopoulos, Alexandros (Siemens Gamesa Renewable Energy) van der Hoek, D.C. (TU Delft Team Jan-Willem van Wingerden) van Wingerden, J.W. (TU Delft Team Jan-Willem van Wingerden) Date 2022 Abstract To increase the contribution of offshore wind energy to the global energy mix in an economically sustainable manner, it is required to reduce the costs associated with the production and operation of offshore wind turbines (OWTs). One of the largest uncertainties and sources of conservatism in design and lifetime prediction for OWTs is the determination of the global damping level of the OWT. Estimation of OWT damping based on field measurement data has hence been subject to considerable research attention and is based on the use of (preferably operational) vibration data obtained from sensors mounted on the structure. As such, it is an output-only problem and can be addressed using state-of-the-art operational modal analysis (OMA) techniques, reviewed in this paper. The evolution of classical time- and frequency-domain OMA techniques has been reviewed; however, the literature shows that the OWT vibration data are often contaminated by rotor speed harmonics of significantly high energy located close to structural modes, which impede classical damping identification. Recent advances in OMA algorithms for known or unknown harmonic frequencies can be used to improve identification in such cases. Further, the transmissibility family of OMA algorithms is purported to be insensitive to harmonics. Based on this review, a classification of OMA algorithms is made according to a set of novel suitability criteria, such that the OMA technique appropriate to the specific OWT vibration measurement setup may be selected. Finally, based on this literature review, it has been identified that the most attractive future path for OWT damping estimation lies in the combination of uncertain non-stationary harmonic frequency measurements with statistical harmonic isolation to enhance classical OMA techniques, orthogonal removal of harmonics from measured vibration signals, and in the robustification of transmissibility-based techniques. To reference this document use: http://resolver.tudelft.nl/uuid:6afd1764-374d-40c2-96bd-1407ae7630d6 DOI https://doi.org/10.5194/wes-7-161-2022 ISSN 2366-7443 Source Wind Energy Science, 7 (1), 161–184 Part of collection Institutional Repository Document type review Rights © 2022 A.A.W. van Vondelen, S.T. Navalkar, Alexandros Iliopoulos, D.C. van der Hoek, J.W. van Wingerden Files PDF wes_7_161_2022.pdf 2.56 MB Close viewer /islandora/object/uuid:6afd1764-374d-40c2-96bd-1407ae7630d6/datastream/OBJ/view