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EnglishParametric resonance is a highly nonlinear phenomenon, difficult to model and foresee, with often detrimental consequences on the power production efficiency of wave energy converters. Parametric excitation, due to time-varying parameters of the system, activates an internal excitation mechanism, which diverts part of the energy from the principal degree of freedom, consequently generating parasitic motions. Although the ability of a mathematical model to articulate parametric instability is beneficial for design and control purposes, the increase in computational burden and complexity is often unacceptable. However, using computationally frugal nonlinear Froude-Krylov force calculations, applicable to axisym-metric devices, it is possible to define mathematical models fast enough for computation in real time. The focus of the paper is a floating oscillating water column device, inspired by the Sparbuoy device, in order to demonstrate the ability of such a mathematical model to describe parametric roll responses.
Parametric motion detection for an oscillating water column spar buoy / Giorgi, G.; Ringwood, J. V.. - (2019), pp. 505-512. ((Intervento presentato al convegno 3rd International Conference on Renewable Energies Offshore, RENEW 2018 tenutosi a Lisbona (Portogallo) nel 2018.
| Titolo: | Parametric motion detection for an oscillating water column spar buoy | |
| Autori: | ||
| Data di pubblicazione: | 2019 | |
| Abstract: | Parametric resonance is a highly nonlinear phenomenon, difficult to model and foresee, with often... detrimental consequences on the power production efficiency of wave energy converters. Parametric excitation, due to time-varying parameters of the system, activates an internal excitation mechanism, which diverts part of the energy from the principal degree of freedom, consequently generating parasitic motions. Although the ability of a mathematical model to articulate parametric instability is beneficial for design and control purposes, the increase in computational burden and complexity is often unacceptable. However, using computationally frugal nonlinear Froude-Krylov force calculations, applicable to axisym-metric devices, it is possible to define mathematical models fast enough for computation in real time. The focus of the paper is a floating oscillating water column device, inspired by the Sparbuoy device, in order to demonstrate the ability of such a mathematical model to describe parametric roll responses. | |
| Appare nelle tipologie: | 4.1 Contributo in Atti di convegno |
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| File | Descrizione | Tipologia | Licenza | |
|---|---|---|---|---|
| GIORGI Parametric motion detection for an oscillating water column spar buoy 2018.pdf | 2. Post-print / Author's Accepted Manuscript | Non Pubblico - Accesso privato/ristretto | Administrator Richiedi una copia |
http://hdl.handle.net/11583/2835296
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