scholarly journals An efficient multi-factor geometry optimization based on motion analysis and resonance response for hinged double-body floating wave energy converter

2020 ◽  
Vol 103 (3) ◽  
pp. 003685042095015
Author(s):  
Biao Li ◽  
Fangfang Sui ◽  
Bingsong Yang
Keyword(s):  
Motion Analysis ◽  
Wave Energy ◽  
Geometry Optimization ◽  
Geometric Optimization ◽  
Wave Energy Converter ◽  
Geometrical Parameters ◽  
Optimization Strategy ◽  
Energy Converter ◽  
Pitching Motion ◽  
Resonance Response

In the practical engineering applications of multi-body floating wave energy converter (WEC), the traditional geometric optimization is always expensive and time-consuming. This study aim to propose a more efficient geometry optimization strategy with a hinged double-body floating WEC as the study object. The influences of geometric parameters of the buoys on the pitching motion and energy conversion ability are analyzed by numerical simulation. Simulation results show that the resonance state of the pitching motion of the buoys mainly depends on their radius and draft rather than the length; But the length of the buoys, rather than the radius and draft, always has a significant effect on the pitching phase difference of the adjacent buoys. Based on the motion analysis and resonance response, an efficient multi-factor geometry optimization strategy is put forwarded. By the strategy, the sub-optimal and optimal geometrical parameters are solved out quickly at several typical wave conditions of China Seas. The results indicate that the optimal total length of WEC is approximately equal to the wave length. The optimal diameter of buoys is about 25% of the length of buoys. And the optimal draft should attain about 61% of the diameter.

scholarly journals Analytical Study on an Oscillating Buoy Wave Energy Converter Integrated into a Fixed Box-Type Breakwater

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Xuanlie Zhao ◽  
Dezhi Ning ◽  
Chongwei Zhang ◽  
Yingyi Liu ◽  
Haigui Kang
Keyword(s):  
Wave Energy ◽  
Wave Energy Converter ◽  
Hydrodynamic Performance ◽  
Maximum Efficiency ◽  
Width Ratio ◽  
Geometrical Parameters ◽  
Linear Potential ◽  
Energy Converter ◽  
Transmission Coefficients ◽  
Incident Waves

An oscillating buoy wave energy converter (WEC) integrated to an existing box-type breakwater is introduced in this study. The buoy is installed on the existing breakwater and designed to be much smaller than the breakwater in scale, aiming to reduce the construction cost of the WEC. The oscillating buoy works as a heave-type WEC in front of the breakwater towards the incident waves. A power take-off (PTO) system is installed on the topside of the breakwater to harvest the kinetic energy (in heave mode) of the floating buoy. The hydrodynamic performance of this system is studied analytically based on linear potential-flow theory. Effects of the geometrical parameters on the reflection and transmission coefficients and the capture width ratio (CWR) of the system are investigated. Results show that the maximum efficiency of the energy extraction can reach 80% or even higher. Compared with the isolated box-type breakwater, the reflection coefficient can be effectively decreased by using this oscillating buoy WEC, with unchanged transmission coefficient. Thus, the possibility of capturing the wave energy with the oscillating buoy WEC integrated into breakwaters is shown.

scholarly journals The Influence of Ramp Shape Parameters on Performance of Overtopping Breakwater for Energy Conversion

2020 ◽  
Vol 8 (11) ◽  
pp. 875
Author(s):  
M. A. Musa ◽  
M. F. Roslan ◽  
M. F. Ahmad ◽  
A. M. Muzathik ◽  
M. A. Mustapa ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Wave Energy ◽  
Shape Parameter ◽  
Wave Energy Converter ◽  
Geometrical Parameters ◽  
Shape Parameters ◽  
Energy Converter ◽  
Wave Condition ◽  
Is Integration ◽  
Wave Discharge

Overtopping breakwater for energy conversion (OBREC) is integration between breakwater and wave energy converter (WEC) that allows incoming waves to be stored in the reservoir. The higher the overtopping amount collected in a reservoir, the greater the energy generated will be. Hence, most of the overtopping concept has attempted to maximize the inclusion of water in the reservoir by optimizing geometrical parameters, particularly the ramp angle. However, the studies corresponding to ramp shapes geometries have not been adequately reviewed. Most studies only focused on the usage of linear overtopping ramp shape. There is still limited knowledge on the influence of different ramp shape parameters towards the overtopping wave. Thus, this paper aimed to push the border of available knowledge by investigating the influence of the ramp shape parameters to the overtopping wave discharge through simulation and experimenting approaches. Seven different ramp shapes have been tested under Malaysia’s wave condition and a new ramp shape parameter allowing for maximized overtopping wave on OBREC is presented.

scholarly journals Hydrodynamic Analysis and Optimization of a Hinged Type Wave Energy Converter

2016 ◽  
Author(s):  
Yuzhu Li ◽  
Heather Peng ◽  
Wei Qiu ◽  
Brian Lundrigan ◽  
Tim Gardiner
Keyword(s):  
Wave Energy ◽  
Second Generation ◽  
Numerical Solutions ◽  
Experimental Studies ◽  
Wave Energy Converter ◽  
Scale Model ◽  
Geometrical Parameters ◽  
Generation Model ◽  
Energy Converter ◽  
Wave Basin

SeaWEED (Sea Wave Energy Extraction Device) is a multi-body floating wave energy converter (WEC) with hinged joints developed by Grey Island Energy Inc. (GIE) in Canada. Initial conceptual studies have been carried out to evaluate the performance of the first generation device by testing a 1:16 scale model in a wave basin. The experimental results were compared with the numerical solutions. Based on the experimental studies, improvements were made and a second generation model with a new geometry of the hull and a new connection structure was developed. This paper is mainly focused on the numerical analysis and optimization of the second generation SeaWEED model. In the numerical studies, the hydraulic power take-off (PTO) system was simulated by a linear spring damper system coupled with the motion of the hinged bodies. The vertical hinge motion was computed at a series of wave periods using WAMIT. Optimization was focused on the PTO damping and the geometrical parameters in terms of the draft and the length of the truss structure between hinged bodies by using the response surface method. An optimal combination of length, draft and PTO damping was recommended for an intended operation location.

scholarly journals Hydrodynamic Investigation of a Dual-Cylindrical OWC Wave Energy Converter Integrated into a Fixed Caisson Breakwater

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 896 ◽  
Author(s):  
Chang Wan ◽  
Can Yang ◽  
Qinghe Fang ◽  
Zaijin You ◽  
Jing Geng ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Analytical Model ◽  
Wave Energy ◽  
Velocity Potential ◽  
Wave Energy Converter ◽  
Published Data ◽  
Geometrical Parameters ◽  
Linear Potential ◽  
Energy Converter ◽  
Cylindrical Column

A fixed dual cylindrical oscillating water column (OWC) acting as a breakwater-type wave energy converter (WEC) is proposed to harvest the wave energy effectively for shallow offshore sites. An analytical model is developed to investigate the hydrodynamic characteristics and the energy capture capacity of the cylindrical OWC device in severe waves. Based on the linear potential flow theory, the analytical solutions of the velocity potential in diffraction mode are solved by matching the Eigen-function expansion technique, and the continuous conditions of the velocity potential and fluid velocity between the computational sub-domains are involved in solving the problem for determining a solution. The proposed model is verified against the published data. The effects of the wave height, the angle of chamber clapboard and the radius of the inner and outer cylindrical column on the energy conversion efficiency are investigated in this paper. To improve the energy conversion performance and obtain a faster prediction for structural optimization of the cylindrical OWC, the geometrical parameters are further discussed in the analytical model. The results indicate that the geometrical parameters of the chamber have significant effects on the wave energy absorption efficiency. It is found that the effective frequency bandwidth of the dual cylindrical column can be broadened by improving the angle of the chamber clapboard and the inner–outer cylinder diameter ratio.

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