Hydroelastic theory for offshore floating plates of variable flexural rigidity

S. Michele; S. Zheng; E. Renzi; A.G.L. Borthwick; D. M Greaves

doi:10.1016/j.jfluidstructs.2023.104060

Hydroelastic theory for offshore floating plates of variable flexural rigidity

S. Michele^*, S. Zheng, E. Renzi, A.G.L. Borthwick, D. M Greaves

^*Corresponding author for this work

Mathematics, Physics and Electrical Engineering

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

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Abstract

We present a theoretical model of the hydrodynamic behaviour of a floating flexible plate of variable flexural rigidity connected to the seabed by a spring/damper system. Decomposition of the response modes into rigid and bending elastic components allows us to investigate the hydroelastic behaviour of the plate subject to monochromatic incident free-surface waves of constant amplitude. We show that spatially dependent plate stiffness affects the eigenfrequencies and modal shapes, with direct consequences on plate dynamics and wave power extraction efficiency. We also examine how plate length and Power Take-Off (PTO) distribution affect the response of the system and its consequent absorbed energy. This work highlights the need to improve existing models of flexible floating energy platforms, especially given their importance in the Offshore Renewable Energy (ORE) sector.

Original language	English
Article number	104060
Number of pages	23
Journal	Journal of Fluids and Structures
Volume	125
Early online date	8 Jan 2024
DOIs	https://doi.org/10.1016/j.jfluidstructs.2023.104060
Publication status	Published - 1 Mar 2024

Keywords

Fluid–structure interaction
Flexible structures
Offshore renewable energy
Potential flow theory

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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Cite this

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title = "Hydroelastic theory for offshore floating plates of variable flexural rigidity",

abstract = "We present a theoretical model of the hydrodynamic behaviour of a floating flexible plate of variable flexural rigidity connected to the seabed by a spring/damper system. Decomposition of the response modes into rigid and bending elastic components allows us to investigate the hydroelastic behaviour of the plate subject to monochromatic incident free-surface waves of constant amplitude. We show that spatially dependent plate stiffness affects the eigenfrequencies and modal shapes, with direct consequences on plate dynamics and wave power extraction efficiency. We also examine how plate length and Power Take-Off (PTO) distribution affect the response of the system and its consequent absorbed energy. This work highlights the need to improve existing models of flexible floating energy platforms, especially given their importance in the Offshore Renewable Energy (ORE) sector.",

keywords = "Fluid–structure interaction, Flexible structures, Offshore renewable energy, Potential flow theory",

author = "S. Michele and S. Zheng and E. Renzi and A.G.L. Borthwick and Greaves, {D. M}",

note = "Funding information: S. Michele and S. Zheng acknowledge support from Centre for Decarbonisation and Offshore Renewable Energy (CDORE), UK seedcorn funding.",

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T1 - Hydroelastic theory for offshore floating plates of variable flexural rigidity

AU - Michele, S.

AU - Zheng, S.

AU - Renzi, E.

AU - Borthwick, A.G.L.

AU - Greaves, D. M

N1 - Funding information: S. Michele and S. Zheng acknowledge support from Centre for Decarbonisation and Offshore Renewable Energy (CDORE), UK seedcorn funding.

PY - 2024/3/1

Y1 - 2024/3/1

N2 - We present a theoretical model of the hydrodynamic behaviour of a floating flexible plate of variable flexural rigidity connected to the seabed by a spring/damper system. Decomposition of the response modes into rigid and bending elastic components allows us to investigate the hydroelastic behaviour of the plate subject to monochromatic incident free-surface waves of constant amplitude. We show that spatially dependent plate stiffness affects the eigenfrequencies and modal shapes, with direct consequences on plate dynamics and wave power extraction efficiency. We also examine how plate length and Power Take-Off (PTO) distribution affect the response of the system and its consequent absorbed energy. This work highlights the need to improve existing models of flexible floating energy platforms, especially given their importance in the Offshore Renewable Energy (ORE) sector.

AB - We present a theoretical model of the hydrodynamic behaviour of a floating flexible plate of variable flexural rigidity connected to the seabed by a spring/damper system. Decomposition of the response modes into rigid and bending elastic components allows us to investigate the hydroelastic behaviour of the plate subject to monochromatic incident free-surface waves of constant amplitude. We show that spatially dependent plate stiffness affects the eigenfrequencies and modal shapes, with direct consequences on plate dynamics and wave power extraction efficiency. We also examine how plate length and Power Take-Off (PTO) distribution affect the response of the system and its consequent absorbed energy. This work highlights the need to improve existing models of flexible floating energy platforms, especially given their importance in the Offshore Renewable Energy (ORE) sector.

KW - Fluid–structure interaction

KW - Flexible structures

KW - Offshore renewable energy

KW - Potential flow theory

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U2 - 10.1016/j.jfluidstructs.2023.104060

DO - 10.1016/j.jfluidstructs.2023.104060

M3 - Article

SN - 0889-9746

VL - 125

JO - Journal of Fluids and Structures

JF - Journal of Fluids and Structures

M1 - 104060

ER -

Hydroelastic theory for offshore floating plates of variable flexural rigidity

Abstract

Keywords

UN SDGs

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