Technical Briefs

At Sea Experiment of a Hybrid Spar for Floating Offshore Wind Turbine Using 1/10-Scale Model

[+] Author and Article Information
Tomoaki Utsunomiya

Associate Professor
e-mail: utsunomiya.tomoaki.4m@kyoto-u.ac.jp

Shintaro Minoura

Department of Civil and Earth Resources Engineering,
Kyoto University,
Kyoto 615-8540, Japan

Hideki Hamamura

Sasebo Heavy Industries,
Nihonbashihamacho 2-31-1,
Tokyo 103-0007, Japan

Iku Sato

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

Kentaro Yasui

Nippon Hume Corporation,
Shinbashi 5-33-11,
Tokyo 105-0004, Japan

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received June 2, 2010; final manuscript received March 28, 2013; published online June 6, 2013. Assoc. Editor: Sergio H. Sphaier.

J. Offshore Mech. Arct. Eng 135(3), 034503 (Jun 06, 2013) (8 pages) Paper No: OMAE-10-1051; doi: 10.1115/1.4024148 History: Received June 02, 2010; Revised March 28, 2013

This study aims at development of a cost-effective, floating offshore wind turbine. The prototype model considered herein is composed of (1) 2-MW horizontal-axis wind turbine (HAWT) of downwind type, (2) steel monotower with 55-m hub height above sea level, (3) steel-prestressed concrete (PC) hybrid SPAR-type foundation with 70-m draft, and (4) catenary mooring system using anchor chains. In order to demonstrate the feasibility of the concept, an at-sea experiment using a 1/10-scale model of the prototype has been made. The demonstrative experiment includes (1) construction of the hybrid SPAR foundation using PC and steel, the same as the prototype; (2) dry-towing and installation to the at-sea site at 30-m distance from the quay of the Sasebo shipbuilding yard; (3) generating electric power using a 1 kW HAWT; and (4) removal from the site. During the at-sea experiment, wind speed, wind direction, tidal height, wave height, motion of the SPAR, tension in a mooring chain, and strains in the tower and the SPAR foundation have been measured. Motion of the SPAR has been numerically simulated and compared with the measured values, where basically good agreement is observed.

Copyright © 2013 by ASME
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Fig. 1

CG of the prototype FOWT model

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Fig. 2

Experimental model

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Fig. 3

Setup of the 1/10-scale model on sea

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Fig. 4

Coordinate system and anchor chain arrangement

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Fig. 5

Time series of roll and pitch responses

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Fig. 6

Power spectrum of roll and pitch responses

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Fig. 7

Time series of tension in anchor chain No. 1

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Fig. 8

Power spectrum of tension in anchor chain No. 1

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Fig. 9

Wind load at hub height

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Fig. 12

Power spectrum for wave height

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Fig. 13

Power spectrum for roll motion

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Fig. 14

Power spectrum for pitch motion

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Fig. 15

Power spectrum for yaw velocity

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Fig. 16

Power spectrum for tension in anchor chain No. 1




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