Internally-resonant broadband point wave energy absorber

2021 ◽  
Vol 247 ◽  
pp. 114751
Author(s):  
Mohammad A. Khasawneh ◽  
Mohammed F. Daqaq
Keyword(s):  
Wave Energy ◽  
Energy Absorber

Dynamic Analysis and Configuration Design of a Two-Component Wave-Energy Absorber

2012 ◽  
Author(s):  
Christophe Cochet ◽  
Ronald W. Yeung
Keyword(s):  
Wave Energy ◽  
Degrees Of Freedom ◽  
Outer Cylinder ◽  
Rigid Body Dynamics ◽  
Contact Forces ◽  
Energy Extraction ◽  
Energy Absorber ◽  
Compound Cylinder ◽  
Motion Study ◽  
Heave Motion

The wave-energy absorber being developed at UC Berkeley is modeled as a moored compound cylinder, with an outer cylinder sliding along a tension-tethered inner cylinder. With rigid-body dynamics, it is first shown that the surge and pitch degrees of freedom are decoupled from the heave motion. The heaving motion of the outer cylinder is analyzed and its geometric proportions (radii and drafts ratios) are optimized for wave-energy extraction. Earlier works of Yeung [1] and Chau and Yeung [2,3] are used in the present heave-motion study. The coupled surge-pitch motion can be solved and can provide the contact forces between the cylinders. The concept of capture width is used to characterize the energy extraction: its maximization leads to optimal energy extraction. The methodology presented provides the optimal geometry in terms of non-dimensional proportions of the device. It is found that a smaller radius and deeper draft for the outer cylinder will lead to a larger capture width and larger resulting motion.

Response of the Mega-Float Equipped With Novel Wave Energy Absorber

2003 ◽  
Author(s):  
Sotaro Masanobu ◽  
Shunji Kato ◽  
Katsuya Maeda ◽  
Yasuhiro Namba
Keyword(s):  
Wave Energy ◽  
Structural Design ◽  
Estimation Method ◽  
The Novel ◽  
Additional Structure ◽  
Energy Absorber ◽  
General Wave ◽  
Wave Drift ◽  
Drift Force ◽  
Hydroelastic Response

The hydroelastic response is significant from the viewpoint of the structural design of a Mega-Float. Equipping a Mega-Float with some additional structures, such as vertical plates, is one of the ways to reduce the hydroelastic response easily. However, in general, wave drift force acting on the Mega-Float may be increased, when the Mega-Float is equipped with the additional structures to reduce the response. In the present study, we developed a novel additional structure that was effective in the reduction of both hydroelastic response and wave drift force. Furthermore, we estimated the response of Mega-Float equipped with the additional structures, and compared the result with the value measured in at-sea experiments. As a result, we confirmed both the effectiveness of the novel additional structure and the validity of the estimation method.

scholarly journals Research on the System Simulation for a Fixed O. W. C. Type Wave Energy Absorber

1984 ◽  
Vol 1984 (156) ◽  
pp. 255-263 ◽  
Author(s):  
Takeshi Kinoshita ◽  
Koichi Masuda ◽  
Shogo Miyajima ◽  
Wataru Kato
Keyword(s):  
Wave Energy ◽  
System Simulation ◽  
Energy Absorber ◽  
Type Wave

scholarly journals Effects of air compressibility in an air-chamber on a performance of a fixed O. W. C. Type Wave Energy Absorber

1985 ◽  
Vol 1985 (157) ◽  
pp. 211-216
Author(s):  
Takeshi Kinoshita ◽  
Koichi Masuda ◽  
Shogo Miyajima ◽  
Wataru Kato
Keyword(s):  
Wave Energy ◽  
Energy Absorber ◽  
Type Wave ◽  
Air Chamber ◽  
A Performance

III-3 A study on floating body of wave energy absorber

1985 ◽  
Vol 12 (6) ◽  
pp. 569 ◽  
Author(s):  
Naomasa Iwasaki ◽  
Norimasa Takagi ◽  
Masanori Abe ◽  
Masaki Sakuta
Keyword(s):  
Wave Energy ◽  
Floating Body ◽  
Energy Absorber

Maximizing the Efficiency of Wave-Energy Plant Using Complex-Conjugate Control

1992 ◽  
Vol 206 (4) ◽  
pp. 225-236 ◽  
Author(s):  
P Nebel
Keyword(s):  
Wave Energy ◽  
Complex Conjugate ◽  
Hydrodynamic Coefficients ◽  
Energy Absorber ◽  
Energy Plant ◽  
Practical Engineering ◽  
Engineering Constraints ◽  
Monochromatic Waves

A method of determining the hydrodynamic coefficients of a floating wave-energy absorber is outlined, and the coefficients of a Salter's duck are measured experimentally. A complex-conjugate synthesizer, derived from these coefficients, is used both theoretically and experimentally to predict and to measure the efficiency of a duck in unidirectional monochromatic waves. The synthesis produces a higher efficiency over a greater bandwidth than has been achieved before. The reason for the improvement in efficiency is explained, and conclusions are drawn about the implications of complex-conjugate control for predicting practical engineering constraints on the design of a full-sized wave-energy absorber.

On a new wave energy absorber

2003 ◽  
Vol 30 (9) ◽  
pp. 1191-1200 ◽  
Author(s):  
Paolo Boccotti
Keyword(s):  
Wave Energy ◽  
New Wave ◽  
Energy Absorber

V-2 Study on the system simulation for an O.W.C. type wave energy absorber

1985 ◽  
Vol 12 (6) ◽  
pp. 580-581 ◽  
Author(s):  
Takeshi Kinoshita ◽  
Koichi Masuda ◽  
Shogo Miyajima ◽  
Wataru Kato
Keyword(s):  
Wave Energy ◽  
System Simulation ◽  
Energy Absorber ◽  
Type Wave
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