Abstract
Operational modal analysis is currently being researched to detect damages in offshore wind turbine structures. To make practical considerations, such as where to place sensors, it is valuable to know how different damages present themselves in the structural dynamics and what kind of damages can be detected given certain detectability limits.
Through conducting natural frequency analysis, the modal response of a structure to damages are explored and resulting considerations for damage detection are discussed. A state of the art, detailed, numerical design model of the Wikinger jacket structure is used to investigate damage detection. Aspects of the model are changed to simulate damage, including member damage, scour, corrosion and more. 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 (MAC).
It is found that when the frequencies of two modes intersect, there is a large change in the mode shape of the two modes from the undamaged case and the choice of which modes to compare between healthy and damaged can change the results significantly. The findings from each simulated damage are presented.
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References
Malekzehtab, H., Golafshani, A.A.: Damage detection in an offshore jacket platform using genetic algorithm based finite element model updating with noisy modal data. Procedia Eng. 54, 480–490 (2013)
Liu, K., Yan, R.-J., Guedes Soares, C.: Damage identification in offshore jacket structures based on modal flexibility. Ocean Eng. 170, 171–185 (Dec. 2018)
Wang, S., Zhang, M., Li, H.: Damage localization of an offshore platform considering temperature variations. Math. Probl. Eng. 2015, 1–10 (2015)
Xu, M., Wang, S., Li, H.: A residual strain energy based damage localisation method for offshore platforms under environmental variations. Ships Offshore Struct., no. December 2018, 2018
Rytter, A.: Vibrational Based Inspection of Civil Engineering Structures. Aalborg Universitet (1993)
BLADT Industries: Wikinger Offshore Wind Farm (2017)
Iberdrola: Wikinger, the project that consolidates Germany as a strategic market. [Online]. Available: https://www.iberdrola.com/about-us/lines-business/flagship-projects/wikinger-offshore-wind-farm
Ramboll: ROSA, Program ROSA Structural Analysis, User’s guide (2019)
Passon, P., Branner, K., Larsen, S.E., Rasmussen, H.J.: Offshore Wind Turbine Foundation Design. Technical University of Denmark – DTU (2015)
Pastor, M., Binda, M., Harčarik, T.: Modal Assurance Criterion. Procedia Eng. 48(48), 543–548 (2012)
Scheu, M.N., Tremps, L., Smolka, U., Kolios, A., Brennan, F.: A systematic Failure Mode Effects and Criticality Analysis for offshore wind turbine systems towards integrated condition based maintenance strategies. Ocean Eng. 176(February), 118–133 (2019)
Luengo, M.M., Kolios, A.: Failure mode identification and end of life scenarios of offshore wind turbines: a review. Energies. 8(8), 8339–8354 (2015)
Guo, J., Wu, J., Guo, J., Jiang, Z.: A Damage Identification Approach for Offshore Jacket Platforms Using Partial Modal Results and Artificial Neural Networks. Appl. Sci. 8(11), (2018)
Kuhn, H.W.: Variants of the hungarian method for assignment problems. Nav. Res. Logist. Q. 3(4), 253–258 (1956)
Weinert, J., Smolka, U., Schümann, B., Cheng, P.W.: Detecting Critical Scour Developments at Monopile Foundations Under Operating Conditions. Proc. Eur. Wind Energy Assoc. Annu. Event, EWEA 2015, pp. 135–139 (2015)
Martinez-Luengo, M., Kolios, A., Wang, L.: Parametric FEA modelling of offshore wind turbine support structures: Towards scaling-up and CAPEX reduction. Int. J. Marine Energy. 19, 16–31 (2017)
Acknowledgements
This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No. 745625 (ROMEO) (“Romeo Project” 2018) (https://www.romeoproject.eu). The dissemination of results herein reflects only the author’s view and the European Commission is not responsible for any use that may be made of the information it contains.
Furthermore, this work was also supported by the sponsorship of University of Strathclyde for pursuing Doctoral Studies within the Centre for Doctoral Training in Renewable Energy Marine Structures - REMS (http://www.rems-cdt.ac.uk/)..
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Richmond, M., Smolka, U., Kolios, A. (2021). Feasibility for Damage Identification in Offshore Wind Jacket Structures Through Numerical Modelling of Global Dynamics. In: Dilworth, B., Mains, M. (eds) Topics in Modal Analysis & Testing, Volume 8. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-030-47717-2_22
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DOI: https://doi.org/10.1007/978-3-030-47717-2_22
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