Experimental Study of Floating Offshore Platform in Combined Wind/Wave/Current Environment
- Wen-Yang Hsu (National Cheng Kung University) | Ray-Yeng Yang (National Cheng Kung University) | Fang-Nan Chang (Ship and Ocean Industries R&D Center) | Hua-Tung Wu (Ship and Ocean Industries R&D Center) | Hsin-Hung Chen (National Cheng Kung University)
- Document ID
- International Society of Offshore and Polar Engineers
- International Journal of Offshore and Polar Engineering
- Publication Date
- June 2016
- Document Type
- Journal Paper
- 125 - 131
- 2016. The International Society of Offshore and Polar Engineers
- semi-submersible floater, drift force, response amplitude operator, Floating offshore wind turbines, wind-wave-current flume
- 1 in the last 30 days
- 86 since 2007
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The development of offshore wind energy in Taiwan is moving toward the establishment of a demonstration wind farm before the end of 2016. The aim of this study is to investigate the dynamic motion of a floating platform in a wind-wave-current flume through the use of a 1:50 Froude-scale model. Compared to the target-scaling properties, the errors in the geometric dimensions and weight of the scale model are less than 2%. A series of experiments were conducted, including free decay tests and complex operating conditions, which combined the irregular waves, current, and wind. The drift and drag force was measured when the floating platform was subjected to the waves, wind, and current.
For harvesting wind energy in deep water, floating foundations are considered to be a more economical solution than fixed foundations. Many scientists and engineers are thus developing suitable floating platforms for supporting wind turbines. Deep-water oil platform technology can provide a basis for designing floating offshore wind turbines (FOWTs); however, differences exist between these types of platforms because of the additional wind forces acting on the turbines and the higher center of gravity due to the tower height. For example, platforms for FOWTs attempt to minimize the pitch and roll motions for effective wind energy production, whereas oil platforms attempt to reduce the heave motion (Muskulus and Schafhirt, 2014).
Three typical offshore floating structures are commonly considered: a spar, a semi-submersible, and a tension-leg platform (TLP). Koo et al. (2014) compared three floaters in a number of wind and wave environments with an emphasis on global motions, wind excitation and damping effects, nacelle acceleration, and mooring loads. They concluded that the performance of floaters can change when specific loads and local environmental conditions are considered; that is, to get an overview of specific FOWT motions, the dynamics of FOWTs in the local environment must be investigated.There are a few multi-megawatt FOWTs in existence. They include Norway’s Hywind, built in 2010 (Statoil, 2014), and WindFloat, a semi-submersible-type FOWT installed in Portugal in June 2012 (EWEA, 2013). Recently, Japan established a spartype FOWT that survived a typhoon (Utsunomiya et al., 2014).
|File Size||2 MB||Number of Pages||7|