TY - JOUR
TI - Sensitivity analysis of geometric characteristics on the cavity-buoy for energy capture efficiency enhancement of a semi-submersible floating-array-buoy wave energy converter system
AU - Paasch, R
AU - He, H
AU - Chen, H
AU - Zhang, J
AU - Li, H
T2 - Ocean Engineering
AB - To investigate the conditions where wave energy resource is sparse, a novel semi-submersible floating-array-buoy wave energy converter (SFABWEC) system was proposed. This system integrates oscillating-array buoys with a semi-submersible floating platform. Geometric characteristics of the energy-capturing mechanisms, cavity-type oscillating-array buoys, were sensitively analyzed to improve the wave energy capture performance. Herein, the effects of different cavity-buoy geometries and the geometry-influenced hydrodynamic coefficients on the motion response and energy capture efficiency of the SFABWEC were evaluated through frequency-domain and time-domain analysis considering regular and irregular waves. A mathematical model was developed to calculate the primary efficiency of buoy-capturing wave energy, and the optimization model was established by comparing the root-mean-square (RMS) efficiency performances of different models. The results show that cavity-buoy with a frustum cone-bottom cylindrical shape, relatively larger size (a diameter of 2.8 m), and larger mass (8070 kg) exhibited higher energy capture efficiency for the given wave condition. With coupled power take-off (PTO) damping, the RMS wave energy capture efficiencies of the optimal-geometric cavity-buoy can reach 18.84% in regular waves and 17.39% in irregular waves, offering significant improvement over the basic model. The numerical results were validated by the experimental results of the test rig provided.
DA - 2024/02//
PY - 2024
VL - 294
UR - https://www.sciencedirect.com/science/article/abs/pii/S0029801824000726
DO - 10.1016/j.oceaneng.2024.116735
LA - English
KW - Wave
KW - Point Absorber
KW - Modeling
KW - Performance
KW - Structural
ER -