Excitation Forces on Point Absorbers Exposed to High Order Non-linear Waves

Thomas Hansen Viuff, Morten Thøtt Andersen, Morten Kramer, Morten Møller Jakobsen

Publikation: Bidrag til bog/antologi/rapport/konference proceedingKonferenceartikel i proceedingForskningpeer review

Abstract

Wave energy devices are often located in intermediate or shallow water close to the free water surface where the wave exposure is extreme. The structures typically consist of large thin curved plates, spherical shells, or cylindrical structures which are sensitive to pressure loads. The lack of proper methods to calculate design pressure distributions has led to structural failures such as buckling in the shells in wave energy prototypes.

As a step towards understanding the complex loading from high order non-linear waves, this paper presents a practical approach to estimate wave excitation forces accounting for both non-linearity and diffraction effects. The method is validated by laboratory experiments using a hemispherical point absorber with a 6-axis force transducer, but the technique is believed to be applicable for most types of submerged or semi-submerged floating devices.

The applied method is based on calculation of a peak force coefficient defined as experimentally measured forces on the structure divided by forces estimated by the chosen theoretical method. Methods used include an integration of the undisturbed wave pressure over the surface of the structure, corresponding to the Froude-Krylov force, and a numerical solution to linear potential diffraction theory. Since the two methods have mutual limitations in describing higher order waves and diffraction, a combination of the two will be introduced.
OriginalsprogEngelsk
Titel10th ewtec 2013 European Wave and Tidal Energy Conference Series : Proceedings of the 10th European Wave and Tidal Energy Conference
RedaktørerPeter Frigaard, Jens Peter Kofoed, AbuBakr S. Bahaj, Lars Bergdahl, Alain Clément, Daniel Conley, Antonio F. O. Falcão, Cameron MacLeod Johnstone, Lucia Margheritini, Ian Masters, António José Sarmento, Diego Vicinanza
Antal sider9
UdgivelsesstedAalborg
ForlagTechnical Committee of the European Wave and Tidal Energy Conference
Publikationsdato2013
StatusUdgivet - 2013
BegivenhedEuropean Wave and Tidal Energy Conference - Aalborg, Danmark
Varighed: 2 sep. 20135 sep. 2013
Konferencens nummer: 10

Konference

KonferenceEuropean Wave and Tidal Energy Conference
Nummer10
Land/OmrådeDanmark
ByAalborg
Periode02/09/201305/09/2013
NavnEuropean Wave and Tidal Energy Conference Series
Nummer10

Bibliografisk note

The proceedings is published on a usb.

Emneord

  • WEC
  • Hemispherical point absorber
  • wave loads
  • Wave regimes
  • Non-linear diffraction

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