Abstract
The tension-leg platform (TLP) supporting structure is a good choice for floating offshore wind turbines because TLP has superior motion dynamics. This study investigates the effects of TLP spoke dimensions on the motion of a floating offshore wind turbine system (FOWT). Spoke dimension and offshore floating TLP were subjected to irregular wave and wind excitation to evaluate the motion of the FOWT. This research has been divided into two parts: (1) Five models were designed based on different spoke dimensions, and aerohydroservo-elastic coupled analyses were conducted on the models using the finite element method. (2) Considering the coupled effects of the dynamic response of a top wind turbine, a supporting-tower structure, a mooring system, and two models on a reduced scale of 1 : 80 were constructed and experimentally tested under different conditions. Numerical and experimental results demonstrate that the spoke dimensions have a significant effect on the motion of FOWT and the experimental result that spoke dimension can reduce surge platform movement to improve turbine performance.
Highlights
Wind energy is one of the most environmentally friendly renewable energy sources that are used to generate power
Matha [12] modified the spoke length of the MIT-tension-leg platform (TLP) model and corrected the faults to improve motion using the FAST software program; this modified model is called the NREL-TLP (National Renewable Energy Laboratory Tension Leg Platform) model
Results indicate that dynamic characteristics improve when spoke dimension is considered
Summary
Wind energy is one of the most environmentally friendly renewable energy sources that are used to generate power. Studies show that fixed foundations, such as monopolies, jackets, and gravity, are not economic for offshore wind turbines with depths greater than 50 m To solve this issue, floating foundation concepts, such as spar, semisubmersible, and tension-leg platform (TLP) supporting structures, have been used [1, 2]. Ren et al performed a model test on a floatingtype wind turbine system on a scale of 1 : 60 to investigate the influence of wind-wave coupling effects on its performance They conducted a numerical simulation and compared the results with that of the model output [16]. Afterwards, two models considered for the spoke dimension experiment on a reduced scale of 1 : 80 were demonstrated in the Harbin Institute of Technology Joint Laboratory of Wind Tunnel and Water Flume The displacements of these two floating wind turbines in two different directions were compared and analyzed
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