TY - JOUR

T1 - Advanced representation of tubular joints in jacket models for offshore wind turbine simulation

AU - Dubois, Jan

AU - Muskulus, Michael

AU - Schaumann, Peter

N1 - Funding Information: This work Advanced jacket models for offshore wind turbines with superelements Project No: 21983/F11, Research Council of Norway - RCN), financially supported in the framework of the IS-Mobil programme by the RCN. The OWT simulation code used within this project is a fully coupled solution consisting of Flex5 and Poseidon, using a Flex5 provided by Repower Systems SE. The RCN as well as the company REpower SE are thus kindly acknowledged.

PY - 2013/8/14

Y1 - 2013/8/14

N2 - Jacket substructures for offshore wind turbines show strong potentials in water depths from 25 up to 70m. A review of state-of-practice and enhanced state-of-the-art modeling of offshore wind turbine jackets is conducted regarding detailed joint properties. The state-of-the-art approach takes advantage of an accurate description of the local joint behavior by use of superelements, enabling more accurate load simulations. Studies conducted in the past highlighted both strong benefits as well as shortcomings of this approach, whereas the drawbacks were mainly related to the size of superelements and the application of local wave loading. This work develops a smart sizing for detailed joint models taking into account the loading and location of the jacket joints. A concept of local wave loading is presented as well. Advice on recommendable parameters is given and enables an optimized superelement application for jacket substructures. As an example the potential for fatigue load reduction is shown using the NREL offshore 5-MW baseline wind turbine and the OC4 reference jacket. The predicted fatigue lifetime was increased by about 15%.

AB - Jacket substructures for offshore wind turbines show strong potentials in water depths from 25 up to 70m. A review of state-of-practice and enhanced state-of-the-art modeling of offshore wind turbine jackets is conducted regarding detailed joint properties. The state-of-the-art approach takes advantage of an accurate description of the local joint behavior by use of superelements, enabling more accurate load simulations. Studies conducted in the past highlighted both strong benefits as well as shortcomings of this approach, whereas the drawbacks were mainly related to the size of superelements and the application of local wave loading. This work develops a smart sizing for detailed joint models taking into account the loading and location of the jacket joints. A concept of local wave loading is presented as well. Advice on recommendable parameters is given and enables an optimized superelement application for jacket substructures. As an example the potential for fatigue load reduction is shown using the NREL offshore 5-MW baseline wind turbine and the OC4 reference jacket. The predicted fatigue lifetime was increased by about 15%.

KW - jackets

KW - offshore wind turbine simulation

KW - substructuring

KW - tubular joints

UR - http://www.scopus.com/inward/record.url?scp=84897541889&partnerID=8YFLogxK

U2 - 10.1016/j.egypro.2013.07.176

DO - 10.1016/j.egypro.2013.07.176

M3 - Conference article

AN - SCOPUS:84897541889

VL - 35

SP - 234

EP - 243

JO - Energy Procedia

JF - Energy Procedia

SN - 1876-6102

T2 - 10th Deep Sea Offshore Wind R and D Conference, DeepWind 2013

Y2 - 24 January 2013 through 25 January 2013

ER -