Optimization of Spacing for Oscillating Wave Surge Converter Arrays Using Genetic Algorithm

Tay, Zhi Yung; Venugopal, Vengatesan

doi:10.1061/(asce)ww.1943-5460.0000368

Cited by 17 publications

(5 citation statements)

References 16 publications

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“…In addition to that, a smaller amount of hinge connectors can facilitate easier installation of pontoon-type WECs. For future work, the performance of the pontoon-type WEC under random wave conditions has to be considered and the uniform PTO configuration applied in the present pontoon-type WEC, which could be further optimized using optimization schemes such as the genetic algorithm method [22].…”

Section: Discussionmentioning

confidence: 99%

Energy Extraction of Pontoon-Type Wave Energy Converter

Tay

Wei

Vakis

2018

Volume 10: Ocean Renewable Energy

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Presented herein is the performance of a pontoon-type wave energy converter (WEC) similar to that of the ‘Floater Blanket’ WEC, which consists of a grid of interconnected floating elements. The current WEC design takes into account the elastic deformation of the structure under wave action and investigates its efficiency in generating wave energy as compared to its counterparts that achieve this via rigid body motions. The power take off (PTO) systems are installed at the seabed and attached to the WEC to generate energy via the vertical motions of the WEC’s structural modules. Three types of pontoon-type WEC designs are investigated, i.e. with hinges, with a reduced number of hinges and without hinges. In addition, the influence of the flexibility of the structural modules towards the energy generation is also investigated in order to assess its performance when behaving like an elastic material. The pontoon-type WEC’s structural modules with fewer or without hinge connections are preferable due to their ease in installation, while allowing for flexible deformation in the structural design would yield savings in material cost.

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Section: Discussionmentioning

confidence: 99%

Energy Extraction of Pontoon-Type Wave Energy Converter

Tay

Wei

Vakis

2018

Volume 10: Ocean Renewable Energy

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“…(2b) 3 Alternative tools include ANSYS AQWA ( [33,50]) and WAMIT ( [36,45,47,[51][52][53]). Spring coefficient is chosen such that the undamped system is at resonance at respectively kr = 1.0 (Case A), and kr = 1.5 (Case B).…”

Section: Fundamentalsmentioning

confidence: 99%

Shape optimization of wave energy converters for broadband directional incident waves

Esmaeilzadeh

Alam

2019

Ocean Engineering

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Here, through a systematic methodology and the use of high performance computing, we calculate the optimum shape for a wave energy converter under the action of incident waves of (i) monochromatic unidirectional, (ii) monochromatic directional, (iii) polychromatic unidirectional and (iv) polychromatic directional (with both directional symmetry and asymmetry). As a benchmark for our study, without loss of generality, we consider a submerged planar pressure differential wave energy converter, and use Genetic Algorithm to search through a wide range of shapes. A new parametric description of absorber shape based on Fourier decomposition of geometrical shapes is introduced, and for each shape hydrodynamic coefficients are calculated, optimum power take-off parameters are obtained, and overall efficiency is determined. We show that an optimum geometry of the absorber plate can absorb a significantly higher energy (in some cases few times higher) when compared to a circular shape of the same area. Specifically, for a unidirectional incident wave, the optimum shape, as expected, is obtained to be the most elongated shape. For directional incident waves, a butterfly-shape is the optimum geometry whose details depend on not only the amplitude and direction of incident wave components, but also the relative phases of those components. For the latter effect, we find an optimally averaged profile through a statistical analysis.

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“…For the terminator array, the devices are spaced at an equal horizontal distance of 2 and vertical distance of . Note that these are the optimal spacings obtained via an optimisation scheme (Tay and Venugopal, 2016) to produce the maximum -factor at the operating wave period . On the other hand, the horizontal spacing and vertical spacing for the attenuator array are 2L and L, respectively, and these spacings are determined to ensure that the devices do not interfere with each other under oblique wave direction.…”

Section: Problem Definitionmentioning

confidence: 99%

The impact of energy extraction of wave energy converter arrays on wave climate under multi-directional seas

Tay

Venugopal

2019

J. Ocean Eng. Mar. Energy

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This paper investigates the energy extraction of three types of wave energy converters (WEC) arranged in arrays and subjected to multi-directional seas of different wave spreading. The changes in the wave climate observed in the neighborhood of the arrays by their energy extraction were also reported. The hydrodynamic software, WAMIT, has been used to generate the performance of the WEC arrays in regular waves, whereas, a post-processing programming code developed in-house has been used to generate the device arrays' performance in multi-directional seas characterized by single-peaked (JONSWAP and Bretschneider) and double-peaked (Ochi-Hubble) wave energy spectra. The results showed interesting findings on the WEC array performance and change in the wave environment around the devices, both strongly depend on the wave energy generation mechanism of the WECs and the wave spreading. The results obtained from the multi-directional seas with double-peaked wave spectrum showed significant differences in the energy production performance by the WEC arrays to those with single-peaked wave spectra. The uni-directional seas resulted in a larger q-factor. The q-factor differed with the peak wave periods, and at small wave periods, the q-factor for the terminator and attenuator WEC arrays are found to be higher than their counterparts for the point absorber WECs. With reference to the 2 of 32 wave height modification in the neighborhood of the WEC arrays, the attenuator generated a greater wave disturbance followed by the terminator and point absorbers.

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Optimization of Spacing for Oscillating Wave Surge Converter Arrays Using Genetic Algorithm

Cited by 17 publications

References 16 publications

Energy Extraction of Pontoon-Type Wave Energy Converter

Energy Extraction of Pontoon-Type Wave Energy Converter

Shape optimization of wave energy converters for broadband directional incident waves

The impact of energy extraction of wave energy converter arrays on wave climate under multi-directional seas

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