Numerical Modeling and Analysis of a Hybrid-Spar Floating Wind Turbine

In this paper, numerical modeling and analysis of a hybrid-spar floating wind turbine is presented. The hybrid-spar consists of steel at the upper part and precast prestressed concrete at the lower part. Such a configuration is referred to as a hybrid-spar in this paper. The hybrid spar was successfully installed offshore of Kabashima island, Goto city, Nagasaki prefecture, Japan, on Oct. 18, 2013 (see Utsunomiya et al., 2015, “Design and Installation of a Hybrid-Spar Floating Wind Turbine Platform,” ASME Paper No. OMAE2015-41544 for details). In this paper, some details on numerical modeling of the hybrid-spar for design load analysis are presented. Then, the validation of the numerical analysis model is presented for a full-scale hybrid-spar model with 2-MW wind turbine. The comparison has been made for the natural periods and the response during rated power production test. Basically, both comparisons have shown good agreement between the measured values and the simulation, showing reliability of the developed code and the numerical model.

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Numerical Modelling and Analysis of a Hybrid-Spar Floating Wind Turbine

Volume 9: Offshore Geotechnics; Torgeir Moan Honoring Symposium ◽

10.1115/omae2017-62578 ◽

2017 ◽

Author(s):

Tomoaki Utsunomiya ◽

Iku Sato ◽

Osamu Kobayashi ◽

Takashi Shiraishi ◽

Takashi Harada

Keyword(s):

Numerical Modelling ◽

Wind Turbine ◽

Prestressed Concrete ◽

Analysis Model ◽

Design Load ◽

Floating Wind Turbine ◽

Load Analysis ◽

Precast Prestressed Concrete ◽

Numerical Modelling And Analysis ◽

Nagasaki Prefecture

In this paper, numerical modelling and analysis of a hybrid-spar floating wind turbine is presented. The hybrid-spar consists of steel at the upper part and the precast prestressed concrete (PC) at the lower part. Such a configuration is referred to as a hybrid-spar in this paper. The hybrid spar was successfully installed offshore of Kabashima Island, Goto city, Nagasaki prefecture, Japan on October 18, 2013 (see OMAE2015-41544 [1] for details). In this paper, some details on numerical modelling of the hybrid-spar for design load analysis are presented. Then, the validation of the numerical analysis model is presented for a full-scale hybrid-spar model with 2-MW wind turbine.

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Design and Installation of a Hybrid-Spar Floating Wind Turbine Platform

Volume 9: Ocean Renewable Energy ◽

10.1115/omae2015-41544 ◽

2015 ◽

Cited By ~ 8

Author(s):

Tomoaki Utsunomiya ◽

Iku Sato ◽

Osamu Kobayashi ◽

Takashi Shiraishi ◽

Takashi Harada

Keyword(s):

Wind Turbine ◽

Prestressed Concrete ◽

Unique Feature ◽

Offshore Wind ◽

Offshore Wind Turbine ◽

Spar Platform ◽

Design Load ◽

Floating Wind Turbine ◽

Precast Prestressed Concrete ◽

Nagasaki Prefecture

A floating offshore wind turbine platform supporting a 2MW downwind-type turbine was successfully installed offshore of Kabashima Island, Goto city, Nagasaki prefecture, Japan on October 18, 2013. It has been operating since October 28, 2013 as the first grid-connected multi-megawatt floating wind turbine in Japan. The spar platform has a unique feature, that is, the upper part of the spar is made of steel (as usual) but the lower part is made of precast prestressed concrete (PC). Such a configuration is referred to as hybrid-spar. In this paper, the design methodology of the hybrid spar is presented — including environmental design conditions, DLCs (Design Load Cases), dynamic analysis, fatigue analysis, etc. Also, the installation procedure is presented briefly.

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Dynamic Response of a Spar-Type Floating Wind Turbine at Power Generation

Volume 7: Ocean Space Utilization; Professor Emeritus J. Randolph Paulling Honoring Symposium on Ocean Technology ◽

10.1115/omae2014-24693 ◽

2014 ◽

Cited By ~ 6

Author(s):

Tomoaki Utsunomiya ◽

Shigeo Yoshida ◽

Soichiro Kiyoki ◽

Iku Sato ◽

Shigesuke Ishida

Keyword(s):

Numerical Simulation ◽

Power Generation ◽

Dynamic Response ◽

Wind Turbine ◽

Prestressed Concrete ◽

Offshore Wind ◽

Offshore Wind Turbine ◽

Floating Foundation ◽

Mooring Dynamics ◽

Nagasaki Prefecture

In this paper, dynamic response of a Floating Offshore Wind Turbine (FOWT) with spar-type floating foundation at power generation is presented. The FOWT mounts a 100kW wind turbine of down-wind type, with the rotor’s diameter of 22m and a hub-height of 23.3m. The floating foundation consists of PC-steel hybrid spar. The upper part is made of steel whereas the lower part made of prestressed concrete segments. The FOWT was installed at the site about 1km offshore from Kabashima Island, Goto city, Nagasaki prefecture on June 11th, 2012. Since then, the field measurement had been made until its removal in June 2013. In this paper, the dynamic behavior during the power generation is presented, where the comparison with the numerical simulation by aero-hydro-servo-mooring dynamics coupled program is made.

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