Abstract
This work investigated the influence of two types of mooring systems on the hydrodynamic performance of a two-body floating wave energy converter (WEC). It also investigated the effects of the physical parameters of the mooring system on the amount of extractable power from incident waves in the frequency domain. The modeled converter comprised a floating body (a buoy), a submerged body with two mooring systems, and a coupling system for two bodies. The coupling system was a simplified power take-off system that was modeled by a linear spring-damper model. The tension leg mooring system could drastically affect the heave motion of the submerged body of the model and increase relative displacement between the two bodies. The effects of the stiffness parameter of the mooring system on power absorption exceeded those of the pretension tendon force.
Highlights
Various devices have been designed, tested, and optimized for the extraction of ocean wave energy
The present study investigated the hydrodynamic performance of a two-body wave energy converter (WEC) heaving in regular waves
In the two-body WEC, the mooring system directly affects the dynamics of the submerged body, and the dynamics of the submerged body affects the amount of relative displacement between the floating and submerged bodies of the converter
Summary
Various devices have been designed, tested, and optimized for the extraction of ocean wave energy. They found that mooring exerted a considerable effect on energy production. They studied and compared the heave motion and hydrodynamics of two 1:25 scale physical models of the two WEC devices with a horizontal three-point taut mooring system They focused on the geometric form and heave oscillation of the submerged body under regular wave excitations but ignored the influence of the mooring system. The effects of the tendon stiffness of the mooring system and their pretension variation on the heave motion of the model were investigated through frequency-domain analysis
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