Semi-submersible vessels

Details Semi-submersible vessels Semi-submersible vessels

1975-07-28

1976-10-19

Blix, Trygve M.

Ships

Warships

Turret

114122, B63B 3544, B63B 3906

Patent

active

039864715

ABSTRACT:
An apparatus for damping vertical movement of a semi-submersible vessel having a small waterplane area, whose buoyancy is provided substantially completely by submerged pontoon means and which includes at least one submerged damper plate having valves or similar flow controllers therein for providing substantially greater resistance to upward movement of the plate than downward movement. The damper plate is supported deep beneath the semi-submersible vessel by flexible, tensioned support elements such as chains or cables, at a depth beneath the water surface in the semi-submerged condition of the vessel, at which depth the amplitude of subsurface wave motion is less than the maximum heave amplitude which would be experienced by the semi-submersible vessel alone under identical sea conditions. The area of the damper plate is several times larger than the waterplane area of the vessel. An upward only-damping action is achieved due to the entrainment of large apparent masses of relatively still water by the damper plate.

REFERENCES:
patent: 1096192 (1914-05-01), Pleva
patent: 2399656 (1946-05-01), Armstrong
patent: 3673974 (1972-07-01), Harper
patent: 3708991 (1973-01-01), Barkley
patent: 3807335 (1974-04-01), Talkington
patent: 3896755 (1975-07-01), Marbury

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