Fatigue Stress Estimation for Submerged and Sub-Soil Welds of Offshore Wind Turbines on Monopiles Using Modal Expansion

The design of monopile foundations for offshore wind turbines is most often driven by fatigue. With the foundation price contributing to the total price of a turbine structure by more than 30%, wind farm operators seek to gain knowledge about the amount of consumed fatigue. Monitoring concepts are d...

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Autores principales:	Maximilian Henkel, Wout Weijtjens, Christof Devriendt
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	real-world measurement data fatigue virtual sensing offshore wind energy monopile Technology T
Acceso en línea:	https://doaj.org/article/1d703538131d4028b23d70a39e19149d
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id	oai:doaj.org-article:1d703538131d4028b23d70a39e19149d
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spelling	oai:doaj.org-article:1d703538131d4028b23d70a39e19149d2021-11-25T17:26:52ZFatigue Stress Estimation for Submerged and Sub-Soil Welds of Offshore Wind Turbines on Monopiles Using Modal Expansion10.3390/en142275761996-1073https://doaj.org/article/1d703538131d4028b23d70a39e19149d2021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/22/7576https://doaj.org/toc/1996-1073The design of monopile foundations for offshore wind turbines is most often driven by fatigue. With the foundation price contributing to the total price of a turbine structure by more than 30%, wind farm operators seek to gain knowledge about the amount of consumed fatigue. Monitoring concepts are developed to uncover structural reserves coming from conservative designs in order to prolong the lifetime of a turbine. Amongst promising concepts is a wide array of methods using in-situ measurement data and extrapolating these results to desired locations below water surface and even seabed using models. The modal decomposition algorithm is used for this purpose. The algorithm obtains modal amplitudes from acceleration and strain measurements. In the subsequent expansion step these amplitudes are expanded to virtual measurements at arbitrary locations. The algorithm uses a reduced order model that can be obtained from either a FE model or measurements. In this work, operational modal analysis is applied to obtain the required stress and deflection shapes for optimal validation of the method. Furthermore, the measurements that are used as input for the algorithms are constrained to measurements from the dry part of the substructure. However, with subsoil measurement data available from a dedicated campaign, even validation for locations below mud-line is possible. After reconstructing strain history in arbitrary locations on the substructure, fatigue assessment over various environmental and operational conditions is carried out. The technique is found capable of estimating fatigue with high precision for locations above and below seabed.Maximilian HenkelWout WeijtjensChristof DevriendtMDPI AGarticlereal-world measurement datafatiguevirtual sensingoffshore wind energymonopileTechnologyTENEnergies, Vol 14, Iss 7576, p 7576 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	real-world measurement data fatigue virtual sensing offshore wind energy monopile Technology T
spellingShingle	real-world measurement data fatigue virtual sensing offshore wind energy monopile Technology T Maximilian Henkel Wout Weijtjens Christof Devriendt Fatigue Stress Estimation for Submerged and Sub-Soil Welds of Offshore Wind Turbines on Monopiles Using Modal Expansion
description	The design of monopile foundations for offshore wind turbines is most often driven by fatigue. With the foundation price contributing to the total price of a turbine structure by more than 30%, wind farm operators seek to gain knowledge about the amount of consumed fatigue. Monitoring concepts are developed to uncover structural reserves coming from conservative designs in order to prolong the lifetime of a turbine. Amongst promising concepts is a wide array of methods using in-situ measurement data and extrapolating these results to desired locations below water surface and even seabed using models. The modal decomposition algorithm is used for this purpose. The algorithm obtains modal amplitudes from acceleration and strain measurements. In the subsequent expansion step these amplitudes are expanded to virtual measurements at arbitrary locations. The algorithm uses a reduced order model that can be obtained from either a FE model or measurements. In this work, operational modal analysis is applied to obtain the required stress and deflection shapes for optimal validation of the method. Furthermore, the measurements that are used as input for the algorithms are constrained to measurements from the dry part of the substructure. However, with subsoil measurement data available from a dedicated campaign, even validation for locations below mud-line is possible. After reconstructing strain history in arbitrary locations on the substructure, fatigue assessment over various environmental and operational conditions is carried out. The technique is found capable of estimating fatigue with high precision for locations above and below seabed.
format	article
author	Maximilian Henkel Wout Weijtjens Christof Devriendt
author_facet	Maximilian Henkel Wout Weijtjens Christof Devriendt
author_sort	Maximilian Henkel
title	Fatigue Stress Estimation for Submerged and Sub-Soil Welds of Offshore Wind Turbines on Monopiles Using Modal Expansion
title_short	Fatigue Stress Estimation for Submerged and Sub-Soil Welds of Offshore Wind Turbines on Monopiles Using Modal Expansion
title_full	Fatigue Stress Estimation for Submerged and Sub-Soil Welds of Offshore Wind Turbines on Monopiles Using Modal Expansion
title_fullStr	Fatigue Stress Estimation for Submerged and Sub-Soil Welds of Offshore Wind Turbines on Monopiles Using Modal Expansion
title_full_unstemmed	Fatigue Stress Estimation for Submerged and Sub-Soil Welds of Offshore Wind Turbines on Monopiles Using Modal Expansion
title_sort	fatigue stress estimation for submerged and sub-soil welds of offshore wind turbines on monopiles using modal expansion
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/1d703538131d4028b23d70a39e19149d
work_keys_str_mv	AT maximilianhenkel fatiguestressestimationforsubmergedandsubsoilweldsofoffshorewindturbinesonmonopilesusingmodalexpansion AT woutweijtjens fatiguestressestimationforsubmergedandsubsoilweldsofoffshorewindturbinesonmonopilesusingmodalexpansion AT christofdevriendt fatiguestressestimationforsubmergedandsubsoilweldsofoffshorewindturbinesonmonopilesusingmodalexpansion
_version_	1718412334751285248

Fatigue Stress Estimation for Submerged and Sub-Soil Welds of Offshore Wind Turbines on Monopiles Using Modal Expansion

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