Experimental performance evaluation and validation of dynamical contact models of the Ocean Grazer

Rooij, Marijn van; Meijer, Harmen; Prins, Wout A.; Vakis, Antonis I.

doi:10.1109/oceans-genova.2015.7271552

Cited by 6 publications

(14 citation statements)

References 2 publications

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“…In previous work, a functional scale prototype of single piston pump (SPP), the main building element of the MP 2 PTO system, was constructed to evaluate the performance of a pumping unit [2]; furthermore, a mathematical model was proposed to investigate its mechanical efficiency. In addition, a time-domain model was developed to demonstrate the advantage of the adaptable MPP for wave energy extraction [3], and a frequencydomain model was used to investigate the hydrodynamic behaviour and performance of a FB with linear PTO system [4].…”

Section: Introductionmentioning

confidence: 99%

“…There are some limitations in our previously developed numerical models. The time-domain model can simulate the FB with the MP 2 PTO system under various sea states; however, due to the nonlinearity of the MP 2 PTO system, it is computationally costly, and thus not suitable to identify the optimal pumping configurations of the system. Particularly, this would be rather critical for an FB consisting of hundreds of floating elements.…”

Section: Introductionmentioning

confidence: 99%

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A Fourier Approximation Method for the Multi-Pump Multi-Piston Power Take-Off System

Wei

Berglind

Almuzakki

et al. 2018

Volume 10: Ocean Renewable Energy

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In this work, a frequency-domain method for the numerical solution of the nonlinear dynamics of a wave energy converter with a pumping system is presented. To this end, a finite Fourier series is used to describe the nonlinear force components, i.e., the pumping force. The dynamics of the buoy and the piston are obtained by solving a set of linear motion equations. The numerical model is validated by comparing it with experimental results. The dynamic characteristics of the pumping system are investigated by performing a series of numerical simulations for several approximation orders under various wave conditions. The advantages and limitations of this method are also discussed in the paper. This work provides great insight into the mechanism of a WEC with a pumping unit under various sea states, which can guide the design of a multi-piston pump (MPP) system. This model will be applied to investigate the optimal configuration for the MPP system in the future.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Fourier Approximation Method for the Multi-Pump Multi-Piston Power Take-Off System

Wei

Berglind

Almuzakki

et al. 2018

Volume 10: Ocean Renewable Energy

Self Cite

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“…A simplified version of this piston-pump model was validated through a scaled down experimental test in (van Rooij et al, 2015). In (BarradasBerglind et al, 2016), preliminary results on the energy capture of an array of point-absorbers were shown, together with a model predictive control strategy to maximize the energy extraction of the OG-WEC.…”

Section: Introductionmentioning

confidence: 99%

Towards Ocean Grazer’s Modular Power Take-Off System Modeling:a Port-Hamiltonian Approach

et al. 2017

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Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. Abstract: This paper presents a modular modeling framework for the Ocean Grazer's Power Take-Off (PTO) system, which operates as an array of point-absorber type devices connected to a hydraulic system. The modeling is based on the port-Hamiltonian (PH) framework that enables energy-based analysis and control of the PTO system. Firstly, a modular model of a pointabsorber hydraulic system, which represents the main building block of the PTO, is presented. The model consists of wave-mechanical and hydraulic subsystems that are interconnected with a transformer-type interconnection. Secondly, we show passivity of the point-absorber hydraulic element and the accumulation of potential energy, which is due to the novel pumping mechanism of the point-absorber. Finally, we illustrate these properties through simulation results.

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“…Its adaptability to different types of waves is one of the main strengths of this WEC, which requires several buoys in a column to extract most of the wave energy in a sequential manner. The WEC is part of the Ocean Grazer, which is a novel ocean energy collection and storage device, designed to extract and store multiple forms of ocean energy (Vakis, Meijer, & Prins 2014, van Rooij, Meijer, Prins, & Vakis 2015, Vakis & Anagnostopoulos 2016.…”

Section: Introductionmentioning

confidence: 99%

Energy capture optimization for an adaptive wave energy converter

Berglind¹,

Meijer²,

Rooij³

et al. 2016

Progress in Renewable Energies Offshore

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Wave energy has great potential as a renewable energy source, and can therefore contribute significantly to the proportion of renewable energy in the global energy mix. This is especially important since energy mixes with high renewable penetration have become a worldwide priority. One solution to facilitate such goals is to harvest the latent untapped energy of the ocean waves and convert it into electrical energy. A device performing such a task is known as a wave energy converter (WEC). In the present work, we focus on a specific type of WEC, which has the advantages of both significant energy storage capabilities, and adaptability to extract energy from the whole spectrum of ocean waves. This WEC consists of an array of point absorber devices, comprising adaptable piston-type hydraulic pumps powered by interconnected floaters, whose target is to extract optimally the energy from waves of varying heights and periods. Two different cases are considered in this paper; namely, the analysis of the energy extraction in a simplified floater blanket, and a model predictive control strategy to maximize the extracted energy of the WEC.

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Experimental performance evaluation and validation of dynamical contact models of the Ocean Grazer

Cited by 6 publications

References 2 publications

A Fourier Approximation Method for the Multi-Pump Multi-Piston Power Take-Off System

A Fourier Approximation Method for the Multi-Pump Multi-Piston Power Take-Off System

Towards Ocean Grazer’s Modular Power Take-Off System Modeling:a Port-Hamiltonian Approach

Energy capture optimization for an adaptive wave energy converter

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