Multi-objective optimum design of a buoy for the resonant-type wave energy converter

Point Absorber Wave Energy Harvesters: A Review of Recent Developments

“…Pastor and Liu [66] numerically simulated a point absorber in both the frequency domain and the time domain, different shapes, diameters and drafts of point absorbers were investigated, and the optimum values for the power absorption with the simulated conditions were pointed out, it was deduced that the shape didn't have a considerable impact on the captured power, whether the increase in diameter resulted in a considerable increase of the captured power. Koh, Ruy, Cho and Kweon [28] conducted a parametric study of the resonant type floater and optimization of the heaving point absorbers where the different geometric parameters that have an influence on the resonant frequency, generated power and production cost were studied. Giorgi and Ringwood [40] applied latching control to a heaving spherical point absorber in a non-linear CFD simulation.…”

“…This necessitates big devices with very large masses in order to coincide the device's natural frequency with the ocean waves frequency and achieve resonance with the incoming waves, which results in design, manufacturing, transport, implementation, mooring, and maintenance difficulties due to the massive volumes and masses.  Theoretical difficulties: Wave energy harvesting is very multidisciplinary containing boundary element methods of hydrodynamics [8,9,13,[16][17][18][19][20][21][22][23][24][25][26][27][28], finite element methods of fluid mechanics [29][30][31][32][33], mechanical to electrical energy transfer [34], power electronics [35,36], and control theories [37][38][39][40][41]. Hydrodynamics for example are theoretically intensive, containing complicated diffraction and radiation wave theories [2] and sometimes non-linear high order wave theories [32,42,43].…”

A Shape Optimization Method of a Specified Point Absorber Wave Energy Converter for the South China Sea

“…Usually, PAs can be divided into four stages [9]: the absorption stage, the transmission stage, the generation stage and the conditioning stage. At the energy absorption stage, geometric optimization is usually used to improve the wave energy capture efficiency [10][11][12][13][14][15][16][17][18]. At the transmission stage, many studies focus on optimizing the PTO system configuration [19][20][21] and proposing new PTO types for different transmission systems, such as nonlinear power capture mechanism [22,23], fluidic flexible matrix composite PTO pump [24] and gyroscopic PTO [25].…”

“…The WEC shape, parametrically described by bi-cubic B-spline surfaces, was assessed using three cost functions within four different constraint regimes defined by two displacements and two power delivery limits. Under the condition of regular waves, Koh [12] used a multi-objective optimization algorithm to optimize the height and radius of a heave-pitch buoy under the constraint of a cost function. Kurniawan [13] applied a multi-objective algorithm to optimize the size and draft of three pitch buoys under the constraints of two cost functions.…”

Analytical Research of Buoy Motion and Power Response of the Floating-Type Double-Hinged Wave Energy Converter

“…W. C. Chen and Y. L. Zhang presumed that the pitching motions of the rafts are axisymmetric in research of the conversion efficiency of raft-type WEC [9]. F. Hedberg and M. Saccullo discussed the optimal design for a raft-type double-hinged floating WEC by numerical simulations considering linear regular waves with an incident angle of zero [10,11].…”