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

[+] Author and Article Information
Tomoaki Utsunomiya

Kyushu University, Department of Marine Systems Engineering, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan

Iku Sato

Toda Corporation, Kyobashi 1-7-1, Chuo-ku, Tokyo 104-8388, Japan

Osamu Kobayashi

Toda Corporation, Kyobashi 1-7-1, Chuo-ku, Tokyo 104-8388, Japan

Takashi Shiraishi

Hitachi, Ltd., Power System Business Unit, Kokubu-cho 1-1-1, Hitachi, Ibaraki 316-8501, Japan

Takashi Harada

Hitachi, Ltd., Power System Business Unit, Sotokanda 1-18-13, Chiyoda-ku, Tokyo 101-8608, Japan

1Corresponding author.

ASME doi:10.1115/1.4041994 History: Received December 25, 2017; Revised September 02, 2018


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 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. 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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