Optimal control of wave cycloidal rotors with passively morphing foils: an analytical and numerical study​

Abel Arredondo-Galeana; Andrei Ermakov; Weichao Shi; John V. Ringwood; Feargal Brennan

doi:10.1016/j.marstruc.2024.103597

Optimal control of wave cycloidal rotors with passively morphing foils: an analytical and numerical study

Abel Arredondo-Galeana, Andrei Ermakov, Weichao Shi, John V. Ringwood, Feargal Brennan

Naval Architecture, Ocean And Marine Engineering

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

68 Downloads (Pure)

Abstract

In this paper we perform an analytical and numerical study of the performance of a wave cycloidal rotor in irregular waves, with passively morphing foils and variable rotational velocity control. The performance is measured in two ways: Mechanical power, and fatigue damage in a sample stress hot spot located at the fixed end of the hydrofoils. We consider different strategies seeking to both maximise power extraction and reduce fatigue damage. To maximise power, we consider both constant and variable rotational speed. To mitigate fatigue damage, we consider, for the first time, morphing foils in the context of a wave cycloidal rotor. By testing these control strategies in isolation and in combination, and with the aid of high performance computation, we find that variable rotational speed, in combination with morphing foils, offers the best compromise to enhance power production with a reduced structural penalty on the sample stress hot spot. Hence, in this work, we demonstrate that novel control strategies, such as those proposed in this work, can hold the key in reducing the levelised cost of energy and accelerate the commercialisation of the next generation of lift-based wave energy converters.

Original language	English
Article number	103597
Number of pages	24
Journal	Marine Structures
Volume	95
Early online date	6 Feb 2024
DOIs	https://doi.org/10.1016/j.marstruc.2024.103597
Publication status	Published - 31 May 2024

Funding

This document is the result of the research project funded by the European Union’s Horizon 2020 Research and Innovation Programme under Grant Agreement No 851885 , and supported in part by a research grant from Science Foundation Ireland and the Sustainable Energy Authority of Ireland under SFI-IRC Pathway Programme 22/PATH-S/10793 . Results were obtained using the Irish Centre for High-End Computing (ICHEC) ( https://www.ichec.ie/ ) and the ARCHIE-WeSt High Performance Computer ( www.archie-west.ac.uk ) based at the University of Strathclyde. The authors would also like to acknowledge the two anonymous reviewers of this work, whose input contributed greatly to improve the quality and organisation of the manuscript. This document is the result of the research project funded by the European Union’s Horizon 2020 Research and Innovation Programme under Grant Agreement No 851885 , and supported in part by a research grant from Science Foundation Ireland and the Sustainable Energy Authority of Ireland under SFI-IRC Pathway Programme 22/PATH-S/10793. This document is the result of the research project funded by the European Union's Horizon 2020 Research and Innovation Programme under Grant Agreement No 851885, and supported in part by a research grant from Science Foundation Ireland and the Sustainable Energy Authority of Ireland under SFI-IRC Pathway Programme 22/PATH-S/10793.This document is the result of the research project funded by the European Union's Horizon 2020 Research and Innovation Programme under Grant Agreement No 851885, and supported in part by a research grant from Science Foundation Ireland and the Sustainable Energy Authority of Ireland under SFI-IRC Pathway Programme 22/PATH-S/10793. Results were obtained using the Irish Centre for High-End Computing (ICHEC) (https://www.ichec.ie/) and the ARCHIE-WeSt High Performance Computer (www.archie-west.ac.uk) based at the University of Strathclyde. The authors would also like to acknowledge the two anonymous reviewers of this work, whose input contributed greatly to improve the quality and organisation of the manuscript.

Keywords

wave energy converter
LiftWEC
cyclorotor
fatigue analysis
velocity control
passive pitch

Access to Document

10.1016/j.marstruc.2024.103597Licence: CC BY 4.0

Arredondo-Galeana-etal-MS-2024-Optimal-control-of-wave-cycloidal-rotorsFinal published version, 2.59 MBLicence: CC BY 4.0

Development of a novel wave energy converter based on hydrodynamic lift forces (LiftWEC) H2020-LC-SC3-2018-2019-2020
Brennan, F. (Principal Investigator) & Payne, G. (Co-investigator)
European Commission - Horizon Europe + H2020
1/12/19 → 31/03/23
Project: Research

Cite this

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title = "Optimal control of wave cycloidal rotors with passively morphing foils: an analytical and numerical study",

abstract = "In this paper we perform an analytical and numerical study of the performance of a wave cycloidal rotor in irregular waves, with passively morphing foils and variable rotational velocity control. The performance is measured in two ways: Mechanical power, and fatigue damage in a sample stress hot spot located at the fixed end of the hydrofoils. We consider different strategies seeking to both maximise power extraction and reduce fatigue damage. To maximise power, we consider both constant and variable rotational speed. To mitigate fatigue damage, we consider, for the first time, morphing foils in the context of a wave cycloidal rotor. By testing these control strategies in isolation and in combination, and with the aid of high performance computation, we find that variable rotational speed, in combination with morphing foils, offers the best compromise to enhance power production with a reduced structural penalty on the sample stress hot spot. Hence, in this work, we demonstrate that novel control strategies, such as those proposed in this work, can hold the key in reducing the levelised cost of energy and accelerate the commercialisation of the next generation of lift-based wave energy converters.",

keywords = "wave energy converter, LiftWEC, cyclorotor, fatigue analysis, velocity control, passive pitch",

author = "Abel Arredondo-Galeana and Andrei Ermakov and Weichao Shi and Ringwood, \{John V.\} and Feargal Brennan",

year = "2024",

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AU - Arredondo-Galeana, Abel

AU - Ermakov, Andrei

AU - Shi, Weichao

AU - Ringwood, John V.

AU - Brennan, Feargal

PY - 2024/5/31

Y1 - 2024/5/31

N2 - In this paper we perform an analytical and numerical study of the performance of a wave cycloidal rotor in irregular waves, with passively morphing foils and variable rotational velocity control. The performance is measured in two ways: Mechanical power, and fatigue damage in a sample stress hot spot located at the fixed end of the hydrofoils. We consider different strategies seeking to both maximise power extraction and reduce fatigue damage. To maximise power, we consider both constant and variable rotational speed. To mitigate fatigue damage, we consider, for the first time, morphing foils in the context of a wave cycloidal rotor. By testing these control strategies in isolation and in combination, and with the aid of high performance computation, we find that variable rotational speed, in combination with morphing foils, offers the best compromise to enhance power production with a reduced structural penalty on the sample stress hot spot. Hence, in this work, we demonstrate that novel control strategies, such as those proposed in this work, can hold the key in reducing the levelised cost of energy and accelerate the commercialisation of the next generation of lift-based wave energy converters.

AB - In this paper we perform an analytical and numerical study of the performance of a wave cycloidal rotor in irregular waves, with passively morphing foils and variable rotational velocity control. The performance is measured in two ways: Mechanical power, and fatigue damage in a sample stress hot spot located at the fixed end of the hydrofoils. We consider different strategies seeking to both maximise power extraction and reduce fatigue damage. To maximise power, we consider both constant and variable rotational speed. To mitigate fatigue damage, we consider, for the first time, morphing foils in the context of a wave cycloidal rotor. By testing these control strategies in isolation and in combination, and with the aid of high performance computation, we find that variable rotational speed, in combination with morphing foils, offers the best compromise to enhance power production with a reduced structural penalty on the sample stress hot spot. Hence, in this work, we demonstrate that novel control strategies, such as those proposed in this work, can hold the key in reducing the levelised cost of energy and accelerate the commercialisation of the next generation of lift-based wave energy converters.

KW - wave energy converter

KW - LiftWEC

KW - cyclorotor

KW - fatigue analysis

KW - velocity control

KW - passive pitch

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