SEMISUBMERGED SHIP WITH BOW IMPACT ALLEVIATOR
An improvement is provided for the semisubmerged ship which reduces the impact effect of large waves when they strike the ship's platform. A semisubmerged ship by having at least one submerged elongate hull supporting a platform above the water's surface by at least one water-surface piercing strut is capable of high-speed operation and a large wave directly striking the platform could damage the ship. Including pairs of lifting hydrofoils on the upper reaches of the forwardly disposed water-surface piercing struts raises the platform to reduce the impact force and the possibility of damage to the platform. Similarly configured bow-shaped projections on the underside of the platform generate lifting forces which raise the platform over the waves to reduce the impact force. Designing the bow shaped projections to be cusp-shaped also helps them cleave into the waves to further reduce the impact and the effects of impact on the underside of the platform. The concave surfaces of the cusps translate the impacting force to tensile stresses in their sheet-metal surfaces. These sheet metal surfaces are capable of bearing greater tensile forces without yielding whereas conventional flat surfaces are deformed and end up irregularly shaped.
- This Government-owned invention available for U.S. licensing and, possibly, for foreign licensing.
Department of the NavyWashington, DC USA
- Lang, T G
- Publication Date: 0
- TRT Terms: Bows; Design; Impacts; Naval architecture; Offshore platforms; Patents; Semisubmersibles; Ships; Slamming; Structural design; Submersibles
- Uncontrolled Terms: Ship design
- Old TRIS Terms: Alleviator; Design process; Offshore platform design; Patents (Slamming protection); Semisubmerged
- Subject Areas: Bridges and other structures; Design; Marine Transportation; Vehicles and Equipment;
- Accession Number: 00146554
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: PAT-APPL-379 509 Patent
- Files: TRIS
- Created Date: Feb 16 1977 12:00AM