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US 8,707,880 B2Granted
Trimaran motion damping
AssigneeAustal Ships Pty. Ltd.
InventorNeville Anthony Armstrong
Life of this patent
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AssigneeAustal Ships Pty. Ltd.
InventorNeville Anthony Armstrong
Estimating the term…
A multi-hulled vessel (10) configured as a trimaran. The multi-hulled vessel (10) comprises a main hull (15) and at least one outer hull (17) to each side of the main hull. The multi-hulled vessel (10) is provided with motion control means (40) for providing damping to wave-induced motion, thereby offering ride control. The motion control means (40) comprises a forward motion damping device (41) disposed adjacent the bow (25) of the main hull (15), and two aft dampening devices (43) disposed one adjacent the stern (33) of each side hull (17). With this arrangement, one of the motion damping devices (41, 43) is located at or near each apex of a notional triangular envelope (44) of the vessel (10). Each motion damping device (41, 43) is configured to resist wave-induced motion of the multi-hulled vessel (10) and thereby provide a damping effect. Each motion damping device (41, 43) may comprise an underwater hydrofoil (45), although other damping arrangements are possible.
A multi-hulled vessel comprising a main hull and at least one side hull to each side of the main hull, each hull having a bow and a stern, and motion control means for providing damping to wave-induced motion, the motion control means comprising a forward motion damping device disposed adjacent the bow of one of the hulls, and an aft motion damping device disposed adjacent the stern of at least one other of the hulls, wherein the second moment of area of the forward motion damping device, in plan view, about the center of flotation of the multi-hulled vessel is between 5% and 15% of the second moment of area of the waterplane of the multi-hulled vessel, and wherein the second moment of area of each of the aft motion damping devices, in plan view, about the centerline of the multi-hulled vessel is between 2% and 6% of the transverse second moment of area of the waterplane of the multi-hulled vessel.
A multi-hulled vessel comprising a main hull and at least one side hull to each side of the main hull, each hull having a bow and a stern, and motion control means for providing damping to wave-induced motion, the motion control means comprising a forward motion damping device disposed adjacent the bow of the main hull, and an aft motion damping device disposed adjacent the stern of at least one side hull on each side of the main hull, wherein the second moment of area of the forward motion damping device, in plan view, about the center of floatation of the multi-hulled vessel is between 5% and 15% of the second moment of area of the waterplane of the multi-hulled vessel, and wherein the second moment of area of each of the aft motion damping devices, in plan view, about the centerline of the multi-hulled vessel is between 2% and 6% of the transverse second moment of area of the waterplane of the multi-hulled vessel.
A trimaran comprising a main hull and two side hulls each having a bow and a stern, and motion control means for providing damping to wave-induced motion, the motion control means comprising a forward motion damping device disposed adjacent the bow of the main hull, and two aft motion damping devices disposed one adjacent the stern of each side hull, wherein the second moment of area of the forward motion damping device, in plan view, about the center of floatation of the trimaran is between 5% and 15% of the second moment of area of the waterplane of the trimaran, and wherein the second moment of area of each of the aft motion damping devices, in plan view, about the centerline of the trimaran is between 2% and 6% of the transverse second moment of area of the waterplane of the trimaran.
Dependencies are inferred from the claim text.