Classification Of Ice-Induced Vibration Regimes Of Offshore Wind Turbines

• Published in: Volume 6: Polar and Arctic Sciences and Technology
• Main Authors: Hammer, T.C. (author), Owen, C.C. (author), van den Berg, M.A. (author), Hendrikse, H. (author)
• Format: Conference Object
• Language: English
• Published: The American Society of Mechanical Engineers (ASME) 2022
• Subjects: ice tank tests; ice-structure interaction; multi-modal interaction; dynamic ice loading; Arctic
• Online Access: http://resolver.tudelft.nl/uuid:7a44f359-60d5-4375-9025-dbbf0fe0704a; https://doi.org/10.1115/OMAE2022-78972

Ice-induced vibrations of offshore wind turbines on monopile foundations were investigated experimentally at the Aalto Ice Tank. A real-time hybrid test setup was developed allowing to accurately simulate the motion of a wind turbine in interaction with ice, incorporating the multi-modal aspects of the interaction and the effect of simultaneous ice and wind loading. Different vibration patterns were observed where some could be described based on the common terminology of intermittent crushing or continuous brittle crushing. However, not all resulting vibrations could be described accordingly. A combination of several global bending modes interacting with the ice resulted in high global ice loads and structural response. Such response is likely typical for an offshore wind turbine, owing to the dynamic characteristics of the structure. The type of interaction observed during the tests would be most critical for design as the largest bending moments in critical cross-sections of the foundations occur for this regime. A classification of ice-induced vibrations is proposed which encompasses the experimental observations for offshore wind turbines on the basis of the periodicity in the structural response at the ice action point. Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Offshore Engineering