Penalba Retes, Markel and Mérigaud, Alexis and Gilloteaux, Jean-Christophe and Ringwood, John (2015) Nonlinear Froude-Krylov force modelling for two heaving wave energy point absorbers. Proceedings of the 11th European Wave and Tidal Energy Conference. ISSN 2309-1983

Preview

Download (2MB) | Preview

Abstract

Most mathematical models used to assess the motions of wave-energy converters are linear, which may lead to significant errors as these devices can have a strongly-nonlinear behaviour. This paper investigates the effects of nonlinearities in the computation of Froude-Krylov forces, which play a major role in the dynamics of the motion of heaving energy pointabsorbers, with a focus on the influence of the device’s geometry. Results show that Froude-Krylov forces nonlinearities could be negligible when the device is uncontrolled. In contrast, they become significant when control is applied to maximise motions, especially for a device whose immersed cross-sectional area varies over time: in such a case latching control parameters based on a linear model can prove to be inefficient. Furthermore, although the latching control can be adapted to the nonlinear behaviour of the device by tuning parameters accordingly, the amount of power production assessed through the linear models does not seem to be achievable.

Item Type:	Article
Keywords:	Wave energy; boundary element method; excitation force; Froude-Krylov force; nonlinear modelling;
Academic Unit:	Faculty of Science and Engineering > Electronic Engineering Faculty of Science and Engineering > Research Institutes > Centre for Ocean Energy Research
Item ID:	6669
Depositing User:	Professor John Ringwood
Date Deposited:	15 Dec 2015 12:11
Journal or Publication Title:	Proceedings of the 11th European Wave and Tidal Energy Conference
Publisher:	European Wave and Tidal Energy Conference 2015
Refereed:	Yes
URI:	Organisation
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

Repository Staff Only(login required)

Item control page

Downloads

Origin of downloads