Damping (heave) plates having improved characteristics

B - Operations – Transporting – 63 – B

Patent

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Details

B63B 39/00 (2006.01) F03B 13/18 (2006.01)

Patent

CA 2652000

A damping (or heave) plate comprises a generally flat plate attached, beneath the surface of a sea, and in horizontal orientation, to a structural member subject to being vertically moved in response to passing surface waves. The plate tends to resist vertical movements and has the effect of adding mass to the structure. A vertically extending structure is added to both major surfaces of the heave plate for increasing the volume of water moved by the plate. For minimizing drag forces generally created by use of the damping plate, the vertically extending structure is shaped to include curved hydrodynamic surfaces for minimizing turbulence in the surrounding water.

L'invention concerne une plaque amortisseuse (dite de pilonnement) comportant une plaque généralement plate fixée, au-dessous de la surface de la mer et dans une orientation horizontale, à un élément structural sujet à des mouvements verticaux en réponse au passage de vagues de surface. La plaque tend à s'opposer aux mouvements verticaux et a pour effet d'ajouter de la masse à la structure. Une structure s'étendant verticalement est ajoutée aux deux surfaces principales de la plaque de pilonnement afin d'accroître le volume d'eau déplacé par la plaque. Pour minimiser les forces de traînée généralement créées par l'utilisation de la plaque amortisseuse, la structure s'étendant verticalement présente une forme comprenant des surfaces hydrodynamiques incurvées afin de minimiser la turbulence dans l'eau environnante.

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