Abstract
In this work the hydrodynamic performance of a novel wave energy converter configuration was analytically and numerically studied by combining a moonpool and a wave energy buoy, called the moonpool platform–wave energy buoy (MP–WEB). A potential flow, semi-analytical approach was adopted to assess the total (incident, diffraction, radiation) wave forces acting on the device, and the wave capture and energy efficiency performance of this configuration was assessed, both in the time and frequency domain. The performance of the two configurations, single float and double float, were analyzed and compared in terms of diffraction force, added mass radiation force, motion, and power in the frequency domain. Using an impulse response function-based (IRF) method, the frequency domain results were converted in the time domain. The same parameters in the time domain were derived and the main results were confirmed. Wave energy conversion efficiency was significantly increased due to the resonance phenomenon inside the moonpool.
Highlights
The interest in exploring marine renewable energy resources, including wind energy, tidal energy, and wave energy for power generation has steadily increased in the last ten years
Milani and Moghaddam [11] studied the process of controlling and maximizing the absorbed power of wave energy converter (WEC) under irregular waves; Bachynski et al [12] promoted the superposition approach to calculate the response in irregular waves; and Yeung et al [13] derived the hydrodynamic coefficient of a cylindrical float, and obtained the energy conversion efficiency of a power generation system by a model test
Proposed a novel two-body floating wave energy converter (WEC), which was tested in the frequency domain to optimize the geometric and mechanical parameters, and subsequently, a time domain model was built for simulation of a multi- DOF motion system
Summary
The interest in exploring marine renewable energy resources, including wind energy, tidal energy, and wave energy for power generation has steadily increased in the last ten years. Milani and Moghaddam [11] studied the process of controlling and maximizing the absorbed power of WECs under irregular waves; Bachynski et al [12] promoted the superposition approach to calculate the response in irregular waves; and Yeung et al [13] derived the hydrodynamic coefficient of a cylindrical float, and obtained the energy conversion efficiency of a power generation system by a model test. Proposed a novel two-body floating wave energy converter (WEC), which was tested in the frequency domain to optimize the geometric and mechanical parameters, and subsequently, a time domain model was built for simulation of a multi- DOF (degree of freedom) motion system. The traditional method can hardly explore the double floating body coupling resonance from the mechanism, and optimize the PTO damping to improve power efficient. Based on the ISSC (In-temational Ship Structure Conference) wave spectrum and the irregular wave simulation, the motion response and capture width ratio of the MP–WEB were investigated in irregular wave conditions
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