MINIMUM FREEBOARD REQUIREMENTS FOR DRY FOREDECKS: A DESIGN PROCEDURE
Deck wetness is an important seakeeping phenomenon. It frequently causes voluntary reductions in ship speed, and it can threaten ship stability and structural integrity. Provision of adequate freeboard will minimize the adverse effects of deck wetness. On the other hand, excessive freeboard must be avoided because of the attendant increases in structural weight and construction cost. Evidently, then, a design procedure which yields minimum required freeboards is needed. This paper introduces such a procedure. Performance limits associated with the ship's underwater body and with the wave environment in which it will operate are derived. Then the freeboards required to operate up to these limits are determined. The procedure is implemented for surface combatants in long-crested head seas; and the sensitivity of the surface combatant model to parametric variations is explored. Finally, the results are synthesized to derive guidelines for utilizing the procedure and to provide preliminary estimates of freeboard requirements.
- Paper presented at SNAME (Gulf Section) Spring Meeting and Star Symposium: Merchant & Naval Design, The Past in Review The Future in Forecast, Houston, April 25-28, 1979.
Society of Naval Architects and Marine Engineers601 Pavonia Avenue
Jersey City, NJ USA 07306-2907
- Bales, N K
- Publication Date: 1979
- Features: References;
- Pagination: 26 p.
- TRT Terms: Decks (Ships); Loads; Military vessels; Naval architecture; Pitch (Dynamics); Rolling; Seakeeping; Ship motion; Slamming; State of the art; Vehicle design; Water waves; Waves
- Uncontrolled Terms: Heaving; Ship design
- Old TRIS Terms: Deck wetness; Freeboard; Heave response; Roll response; Ship response; Wave loads; Wave profiles
- Subject Areas: Design; Hydraulics and Hydrology; Marine Transportation;
- Accession Number: 00189638
- Record Type: Publication
- Source Agency: Society of Naval Architects and Marine Engineers
- Files: TRIS
- Created Date: Apr 25 1979 12:00AM