Abstract
A floating offshore wind turbine (FOWT) concept with a guy-wire-supported tower was investigated to obtain motion results in waves considering its elastic model characteristics. The FOWT concept studied aims to reduce the construction costs by using a light-weight structure tensioned with guy wires and a downwind type. Wave tank experiments of an elastically similar segmented backbone model in the 1:60 scale were carried out to clarify the dynamic elastic response features of the structure. The experimental results were compared with numerical simulations obtained from NK-UTWind and WAMIT codes. The bending moment measured at the tower and pontoons had two peak values for different wave periods carried out. The short-wave period peak was due to sagging/hogging when the wavelength matched the floater length. The second peak was due to the large tower top acceleration, which caused a large bending moment at the tower base and pontoon to support the inertia force. The wind force was not significant to modify the FOWT response. The sensibility analysis in pontoons and tower rigidities confirmed the importance of the guy wires to support the inertia due to the waves and wind incidence. The new concept of a very-light FOWT with a guy-wire-supported tower may be an option for future FOWT developments.
Highlights
Offshore wind has enormous potential since it allows the use of more constant and stronger winds.Large turbines could be used as there is no problem of visual pollution and noise generation
6; Wave and measured in this experiment; directions were as in Figure this study focuses on the floater’s motion behavior and elastic characteristics due to the this study focuses on the floater’s motion behavior and elastic characteristics due to the wave incidence
The best calibrated external damping level for the cross term was ζ35 = ζ53 = −0.005, which implied an excellent agreement for short-wave periods, T < 15, and the same response amplitude operators (RAOs) heave value in the pitch natural period
Summary
Offshore wind has enormous potential since it allows the use of more constant and stronger winds. Light structures simple to build and easy to install are essential to minimize costs. Demonstration Offshore Wind Farm” project adopted many solution concepts as a barge [1,2], semisubmersibles (SS)As[3,4,5,6], and spar type [7,8]. Wind Farm” project adopted many solution concepts as a barge [1,2], semi-submersibles (SS) [3,4,5,6], In this context, a new idea of a floating offshore wind turbine (FOWT) has been proposed. The and spar type [7,8] floaters aiming for further cost reduction and wind farm developments as the conceptual Fukushima idea consists ofOffshore an arrangement with a central. Projecttower [9,10,11]. connected by pontoons to three columns by an angle degrees,
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