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Article

Feasibility for Damage Identification in Offshore Wind Jacket Structures through Monitoring of Global Structural Dynamics

1
Department of Naval Architecture, Ocean & Marine Engineering, University of Strathclyde, Glasgow G4 0LZ, UK
2
Offshore Wind New Services Department, Ramboll, 20095 Hamburg, Germany
*
Author to whom correspondence should be addressed.
Energies 2020, 13(21), 5791; https://doi.org/10.3390/en13215791
Received: 9 October 2020 / Revised: 29 October 2020 / Accepted: 3 November 2020 / Published: 5 November 2020
(This article belongs to the Special Issue Risk and Integrity Management of Energy Assets)
The modal response of a four-legged jacket structure to damages are explored and resulting considerations for damage detection are discussed. A finite element model of the Wikinger (Iberdrola) jacket structure is used to investigate damage detection. Damages, such as cracks, scour, corrosion and more, are modelled in a simulation environment. The resulting modal parameters are calculated, these parameters are compared to those from an unaltered structure and metrics are calculated including frequency change, modal assurance criterion and modal flexibility. A highly detailed design-model is used to conduct a sensitivity study on modal parameters for a range of changes. By conducting this on the same structure, this acts as a useful reference for those interested in the dynamic response of offshore wind jacket structures. Additionally, this paper addresses the issue of changes in mode parameters resulting from turbine yaw. This paper also considers the challenge of mode-swapping in semi-symmetric structures and proposes several approaches for addressing this. Damage typically results in a reduction of frequency and change in mode shapes, but in ways which can be distinguished from other structural changes, given the extent of this model. These findings are important considerations for modal-based damage detection of offshore wind support structures. View Full-Text
Keywords: offshore wind jacket structure; natural frequencies; mode shapes; damage identification; finite element model offshore wind jacket structure; natural frequencies; mode shapes; damage identification; finite element model
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MDPI and ACS Style

Richmond, M.; Smolka, U.; Kolios, A. Feasibility for Damage Identification in Offshore Wind Jacket Structures through Monitoring of Global Structural Dynamics. Energies 2020, 13, 5791. https://doi.org/10.3390/en13215791

AMA Style

Richmond M, Smolka U, Kolios A. Feasibility for Damage Identification in Offshore Wind Jacket Structures through Monitoring of Global Structural Dynamics. Energies. 2020; 13(21):5791. https://doi.org/10.3390/en13215791

Chicago/Turabian Style

Richmond, Mark, Ursula Smolka, and Athanasios Kolios. 2020. "Feasibility for Damage Identification in Offshore Wind Jacket Structures through Monitoring of Global Structural Dynamics" Energies 13, no. 21: 5791. https://doi.org/10.3390/en13215791

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