Details
| Originalsprache | Englisch |
|---|---|
| Aufsatznummer | 012013 |
| Fachzeitschrift | Journal of Physics: Conference Series |
| Jahrgang | 1104 |
| Frühes Online-Datum | 6 Nov. 2018 |
| Publikationsstatus | Veröffentlicht - 2018 |
| Veranstaltung | 15th Deep Sea Offshore Wind R and D Conference, EERA DeepWind 2018 - Trondheim, Norwegen Dauer: 17 Jan. 2018 → 19 Jan. 2018 |
Abstract
Sub-structures of offshore wind turbines are designed according to several design load cases (DLCs) that cover various fatigue (FLS) and ultimate limit states (ULS). The required DLCs are given in the current standards, and are supposed, on the one hand, to cover accurately all significant load conditions to guarantee reliability. On the other hand, they should include only necessary conditions to keep computing times manageable. For ULS conditions, the current work addresses the question whether the current design practice is, firstly, sufficient, and secondly, sensible concerning the computing time by only including necessary DLCs. To address this topic, data of five years of normal operation, simulated using a probabilistic approach, is used to extrapolate 20-year ULS loads (comparable to a probabilistic version of DLC 1.1 for substructures). These ULS values are compared to several deterministic DLCs required by current standards. Results show that probabilistic, extrapolated ULS values are fairly high and exceed standard DLC loads. Hence, the current design practice might not always be conservative. Especially, the benefit of an additional DLC for wave peak periods close to the eigenfrequency of the sub-structure is indicated.
ASJC Scopus Sachgebiete
- Physik und Astronomie (insg.)
- Allgemeine Physik und Astronomie
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in: Journal of Physics: Conference Series, Jahrgang 1104, 012013, 2018.
Publikation: Beitrag in Fachzeitschrift › Konferenzaufsatz in Fachzeitschrift › Forschung › Peer-Review
}
TY - JOUR
T1 - Assessment of a standard ULS design procedure for offshore wind turbine sub-structures
AU - Hübler, Clemens
AU - Gebhardt, Cristian G.
AU - Rolfes, Raimund
N1 - Funding information: We gratefully acknowledge the financial support of the Lower Saxony Ministry of Science and Culture (MWK; ventus efficiens, FKZ ZN3024) and the European Commission (IRPWind, grant agreement number 609795). This work was supported by the compute cluster funded by Leibniz Universität Hannover, the MWK, and the German Research Foundation (DFG).
PY - 2018
Y1 - 2018
N2 - Sub-structures of offshore wind turbines are designed according to several design load cases (DLCs) that cover various fatigue (FLS) and ultimate limit states (ULS). The required DLCs are given in the current standards, and are supposed, on the one hand, to cover accurately all significant load conditions to guarantee reliability. On the other hand, they should include only necessary conditions to keep computing times manageable. For ULS conditions, the current work addresses the question whether the current design practice is, firstly, sufficient, and secondly, sensible concerning the computing time by only including necessary DLCs. To address this topic, data of five years of normal operation, simulated using a probabilistic approach, is used to extrapolate 20-year ULS loads (comparable to a probabilistic version of DLC 1.1 for substructures). These ULS values are compared to several deterministic DLCs required by current standards. Results show that probabilistic, extrapolated ULS values are fairly high and exceed standard DLC loads. Hence, the current design practice might not always be conservative. Especially, the benefit of an additional DLC for wave peak periods close to the eigenfrequency of the sub-structure is indicated.
AB - Sub-structures of offshore wind turbines are designed according to several design load cases (DLCs) that cover various fatigue (FLS) and ultimate limit states (ULS). The required DLCs are given in the current standards, and are supposed, on the one hand, to cover accurately all significant load conditions to guarantee reliability. On the other hand, they should include only necessary conditions to keep computing times manageable. For ULS conditions, the current work addresses the question whether the current design practice is, firstly, sufficient, and secondly, sensible concerning the computing time by only including necessary DLCs. To address this topic, data of five years of normal operation, simulated using a probabilistic approach, is used to extrapolate 20-year ULS loads (comparable to a probabilistic version of DLC 1.1 for substructures). These ULS values are compared to several deterministic DLCs required by current standards. Results show that probabilistic, extrapolated ULS values are fairly high and exceed standard DLC loads. Hence, the current design practice might not always be conservative. Especially, the benefit of an additional DLC for wave peak periods close to the eigenfrequency of the sub-structure is indicated.
UR - http://www.scopus.com/inward/record.url?scp=85057830400&partnerID=8YFLogxK
U2 - 10.1088/1742-6596/1104/1/012013
DO - 10.1088/1742-6596/1104/1/012013
M3 - Conference article
AN - SCOPUS:85057830400
VL - 1104
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
M1 - 012013
T2 - 15th Deep Sea Offshore Wind R and D Conference, EERA DeepWind 2018
Y2 - 17 January 2018 through 19 January 2018
ER -