Ships – Floating platform – Multiple leg
Patent
1987-09-25
1989-09-12
Peters, Jr., Joseph F.
Ships
Floating platform
Multiple leg
114125, B63B 4306
Patent
active
048649589
ABSTRACT:
A system for stabilizing floating semi-submersible platforms and compensating ship motion of monohull ships is based on a design protecting waterplane from vertical movement during wave actions. Each vertical strut of the semi-submersible platform utilizing this system consists of a vertical hollow column with its upper end connected to the platform upper structure and lower end open to the surrounding water. Inside the vertical hollow column is inserted a buoyancy vessel which is connected to the upper platform structure by its upper part and which serves as a means of forming a waterplane. During passive mode of this system operation, the roll and pitch of the floating platform (ship), due to wave induced forces, will be introduced because the vertical movement of the water level inside the vertical hollow column will be considerably less than the vertical movement of the water outside the vertical hollow column. During the active mode of SWAP system operation, the roll and pitch of the floating platform (ship), due to wave induced forces, or trim and list, due to the outer moment acting on the ship, will be eliminated or drastically reduced by changing the air pressure in the space between vertical hollow columns, inserted buoyancy vessel and waterline inside the vertical hollow column.
REFERENCES:
patent: 2024822 (1935-12-01), Hart
patent: 3318275 (1967-05-01), Field
patent: 3537412 (1970-11-01), Henderson
patent: 3580205 (1971-05-01), Bell
Peters Jr. Joseph F.
Swinehart Edwin L.
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