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Optimisation of a dynamic absorber with nonlinear stiffness and damping for the vibration control of a toy model for floating offshore wind turbine

Abstract : Passive vibration mitigation of offshore wind turbines using nonlinear absorber or nonlinear energy sink has started to receive attention in the literature. In most case, little attention had been made on the possibility of detached resonance occurring when nonlinear energy sink is attached to the linear system describing the wind turbine. Sea movements that alter the initial conditions of the floating offshore wind turbine can lead to the nonlinear energy sink operating on one or more detached resonances that completely negate its ability to control turbine vibration. In this paper, we are interested in optimizing the parameters of a nonlinear energy sink with nonlinear stiffness and nonlinear viscous damping for the vibration control of a toy model (say a linear mass-stiffener-damper system) of a floating offshore wind turbine over its entire operating range. The mechanism of cancellation of the detached resonance is studied analytically under 1:1 resonance. It is shown that the nonlinear energy sink with a properly tuned nonlinear viscous damping allow the complete elimination of undesired regimes and completely restores the absorber ability to strongly limit floating offshore wind turbine vibration over its whole forcing range. The results obtained over a large domain of parameters suggest that both nonlinear energy sink optimal parameter (linear and nonlinear stiffness and nonlinear damping) and attenuation of floating offshore wind turbine vibratory motion depend upon simple power laws of nonlinear energy sink mass and linear damping.
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https://hal.archives-ouvertes.fr/hal-03792459
Contributeur : Pierre-Olivier Mattei Connectez-vous pour contacter le contributeur
Soumis le : vendredi 30 septembre 2022 - 10:36:29
Dernière modification le : samedi 1 octobre 2022 - 03:13:29

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JTCAM-Mattei-Cote-2022.pdf
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  • HAL Id : hal-03792459, version 1

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Pierre-Olivier Mattei, Renaud Côte. Optimisation of a dynamic absorber with nonlinear stiffness and damping for the vibration control of a toy model for floating offshore wind turbine. {date}. ⟨hal-03792459⟩

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