Experimental study of wave energy extraction by a dual-buoy heaving system

Kim, Jongyun; Koh, Hyeok-Jun; Cho, Il-Hyoung; Kim, M.H.; Kweon, Hyuck-Min

doi:10.1016/j.ijnaoe.2016.07.002

Cited by 24 publications

(10 citation statements)

References 8 publications

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“…It was found that the two-body systems were able to absorb higher power significantly than the single buoy systems with the same floating buoy in both regular and irregular waves and had a resonant frequency close to the low excitation frequency of real ocean waves [94]. The dualbuoy system where the relative heave motions between the dual buoys are amplified through highly amplified internal-fluid motions is shown in Figure 9 [95]. Al Shami, et al [96] studied the effect of different design parameters on wave energy conversion performance using…”

Section: Two-body Systemsmentioning

confidence: 98%

A Survey of Power Take-off Systems of Ocean Wave Energy Converters

Z¹,

Zhang²,

Xiao³

et al. 2019

Preprint

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Ocean wave energy conversion as one of the renewable clean energy sources is attracting the research interests of many people. This review introduces different types of power take-off technology of wave energy converters. The main focus is the linear direct drive power take-off devices as they have the advantages for ocean wave energy conversion. The designs and optimizations of power take-off systems of ocean wave energy converters have been studied from reviewing the recently published literature. Also, the simple hydrodynamics of wave energy converters have been reviewed for design optimization of the wave energy converters at specific wave sites. The novel mechanical designs of the power take-off systems have been compared and investigated in order to increase the energy harvesting efficiency.

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Section: Two-body Systemsmentioning

confidence: 98%

A Survey of Power Take-off Systems of Ocean Wave Energy Converters

Z¹,

Zhang²,

Xiao³

et al. 2019

Preprint

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show abstract

“…As discussed earlier in Section 2.3.1, some cases are computationally intensive to investigate due to theoretical difficulties; this is particularly true for the two-body devices due to the increase of viscous damping and non-linearities. Kim, et al [97] experimentally investigated a 1:5.95 scaled down model of a dual buoy WEC in a wave tank under both regular and irregular waves. The model consists of a main outer buoy, and an inner one with water in between.…”

Section: Experimental Investigationmentioning

confidence: 99%

Point Absorber Wave Energy Harvesters: A Review of Recent Developments

2018

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Even though ocean waves around the world are known to contain high and dense amounts of energy, wave energy harvesters are still not as mature as other forms of renewable energy harvesting devices, especially when it comes to commercialization, mass production, and grid integration, but with the recent studies and optimizations, the point absorber wave energy harvester might be a potential candidate to stand out as the best solution to harvest energy from highly energetic locations around the world’s oceans. This paper presents an extensive literature review on point absorber wave energy harvesters and covers their recent theoretical and experimental development. The paper focuses on three main parts: One-body point absorbers, two-body point absorbers, and power take-offs. This review showcases the high amount of work being done to push point absorbers towards technological maturity to eventually kick off commercialization and mass production. It should also provide a good background on the recent status of point absorber development for researchers in the field.

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“…The virtual model of the point absorber with cylinder and conical point absorber is created using Auto-desk Inventor, a computer-aided design (CAD) application. J.Kim [9] addressed the cylinder two body point absorber, whereas [10] examined a conical two body point absorber's numerical model. CFD software was used to evaluate the fluid problem associated with an existing point absorber device.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Performance of Heaving Motion on Cylinder and Conical Two-Body Point Absorber in Low Wave Energy

Ramli

Mustapa

Rozali

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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A The motion response of floating wave energy converters (WEC) is crucial for study in the field of ocean energy harvesting. A well-known design for gathering ocean wave energy is the floating wave energy point absorber. It is commonly investigated theoretically using idealised one- and two-degrees-of-freedom dynamic models based on the system's number of free bodies. Using Computational Fluid Dynamics (CFD) software, this article evaluates the hydrodynamic damping of heaving motions on cylinder and conical two-body point absorber wave energy harvesters. The damping performance of both point absorber devices in the Sarawak zone was evaluated using a simulation run at low wave heights (0.25m-2.25m) and short wave periods (3.5s-9.5s). Both point absorber bodies are modelled to determine their heaving dynamic motion frequency under calm, medium, and strong wave conditions. This analysis reveals the extensive research being undertaken to advance point absorbers' technical maturity, ultimately paving the way for commercialization and mass production. The results reveal that a cylinder two-body point absorber with a Response Amplitude Operator (RAO) is more efficient than a conical point absorber at absorbing low wave heights.

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Experimental study of wave energy extraction by a dual-buoy heaving system

Cited by 24 publications

References 8 publications

A Survey of Power Take-off Systems of Ocean Wave Energy Converters

A Survey of Power Take-off Systems of Ocean Wave Energy Converters

Point Absorber Wave Energy Harvesters: A Review of Recent Developments

Hydrodynamic Performance of Heaving Motion on Cylinder and Conical Two-Body Point Absorber in Low Wave Energy

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