Effect of Internal Fluid Resonance on the Performance of a Floating OWC Device

Cho, Il-Hyoung

doi:10.26748/ksoe.2021.011

Cited by 6 publications

(6 citation statements)

References 18 publications

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“…Performing frequency-domain motion analysis of the FPSO, it was confirmed that roll motion had a much more negative effect on total radiation than pitch motion. Studies regarding mooring design have been released, even though they were for the different types of floating renewable platforms such as floating wave converters and wind turbines [16,17].…”

Section: Of 15mentioning

confidence: 99%

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Structural Effects of Mass Distributions in a Floating Photovoltaic Power Plant

Choung

2022

JMSE

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This study deals with a solar photovoltaic demonstration project composed of four types of sub-plants that will be operated in the Saemangeum Seawall coast. The project aimed to investigate the most efficient sub-plant types. Hydrodynamic analyses were undertaken to obtain the loads exerted on the floating photovoltaic power plants on which two kinds of frame structures supported shed- and gable-type photovoltaic panels, producing the four types of sub-plants composed of three floaters. Hydrodynamic interactions between the floaters were considered because floaters were linked with hinge joints. The pressure and acceleration response operator amplitudes were transferred to the finite element analysis model using an in-house code. Because each sub-plant had a different mass and second moments of mass, it was found that huge stresses had been retained in hinge joints. After the masses in the twelve floaters were evenly distributed, the maximum stresses were reduced so that they were less than material yield strengths. There were larger stresses in the POSCO (Pohang Iron and Steel Company) magnesium alloy coating (POSMAC) frames than in the fiber-reinforced plastic (FRP) frames because the POSMAC frame had an open-channel section. It is concluded that weight in each floating unit should be evenly controlled if hinged joints are used to link the floaters.

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Section: Of 15mentioning

confidence: 99%

“…on total radiation than pitch motion. Studies regarding mooring design have been released, even though they were for the different types of floating renewable platforms such as floating wave converters and wind turbines [16,17].…”

Section: Geometric Details Of the Pilot Pv Platformmentioning

confidence: 99%

Structural Effects of Mass Distributions in a Floating Photovoltaic Power Plant

Choung

2022

JMSE

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“…Linear (Airy) wave theory was used to describe the water particle kinematics. The incident wave power per unit crest width of a regular wave can be expressed as follows [40]: kg/m was applied for all simulation cases. Among the four locations, Buan exhibited the largest incident wave power.…”

Section: Single Hemispherical Floatmentioning

confidence: 99%

“…Linear (Airy) wave theory was used to describe the water particle kinematics. The incident wave power per unit crest width of a regular wave can be expressed as follows [40]:…”

Section: Single Hemispherical Floatmentioning

confidence: 99%

Dynamic Response Analysis of a Wavestar-Type Wave Energy Converter Using Augmented Formulation in Korean Nearshore Areas

Heo

Koo

2021

Processes

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Interest in water wave power generation, a promising source of renewable energy, is increasing. Numerous types of wave energy converters (WECs) have been designed to transform wave energy into electricity. In this study, we focus on heaving point absorbers (HPAs) of the Wavestar type, which consist of multiple floats connected to a bottom-fixed ocean structure by structural arms and hinges. Each float moves up and down due to wave forces and produces electricity using the hydraulic power take-off (PTO) system connected directly to the float. A numerical procedure using the three-dimensional augmented formulation was developed to calculate the rotational motion of the float. The frequency-dependent coefficients were calculated using the hydrodynamic solver WAMIT. The nonlinear Froude–Krylov and hydrostatic forces were considered. For the environmental conditions, the wave data of four nearshore areas in Korea, obtained from the Korea Meteorological Administration (KMA), were used. Under the given environmental conditions, Buan was found to be the most suitable area among the locations selected for installing a Wavestar-type WEC without considering installation and maintenance costs.

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“…Many studies have focused on the power efficiency of WECs [3][4][5]. One way to increase the power efficiency is that WECs could be integrated with other marine structures, such as breakwaters or seawalls [6].…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Analysis of a Breakwater-Integrated Heaving-Buoy-Type Wave Energy Converter with an Optimal Artificial Damping Scheme

2022

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A three-dimensional frequency-domain numerical wave tank (FR-NWT) based on the Rankine panel method was developed. An optimal artificial damping zone (ADZ) scheme was first applied to the FR-NWT to prevent reflection waves from the end walls. Parametric studies of ramp function shape with artificial damping coefficients and damping zone length were conducted to find a proper damping scheme for the frequency domain program. Applying both the Sommerfeld radiation condition and the ADZ scheme to the frequency domain program can reduce the length of the ADZ to less than one wavelength. The FR-NWT developed by the authors was used to calculate the hydrodynamic response of a hemispherical-heaving buoy wave energy converter (WEC) integrated with a seawall-type breakwater of infinite length. A linear power take-off system was used to calculate power generation of the WEC. The global motion of the WEC combined with the breakwater was up to 1.85 times greater than that of the WEC without the breakwater. Moreover, the capture width ratio of the WEC increased approximately 3.67 times more than that of the WEC without the breakwater.

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Effect of Internal Fluid Resonance on the Performance of a Floating OWC Device

Cited by 6 publications

References 18 publications

Structural Effects of Mass Distributions in a Floating Photovoltaic Power Plant

Structural Effects of Mass Distributions in a Floating Photovoltaic Power Plant

Dynamic Response Analysis of a Wavestar-Type Wave Energy Converter Using Augmented Formulation in Korean Nearshore Areas

Hydrodynamic Analysis of a Breakwater-Integrated Heaving-Buoy-Type Wave Energy Converter with an Optimal Artificial Damping Scheme

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