Accession Number : ADA294545

Title :   Seakeeping Aspects Of Slice Hulls.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Peffers, Stephen B.

PDF Url : ADA294545

Report Date : MAR 1995

Pagination or Media Count : 108

Abstract : Seakeeping calculations are performed for a new hull design, SLICE. This hull type is a variation of a Small Waterplane Twin Hull (SWATH) ship, with the primary difference of discontinuous fore and aft buoyancy pods. Emphasis in this work is placed on understanding the applicability and limitations of a standard strip theory approach to coupled heave and pitch motions in regular and random seas. It is shown that the coupled pitch and heave natural periods change with forward speed and wave direction, unlike the SWATH case where the uncoupled heave natural period remains approximately constant. The results of this study indicate that the problem of resonant frequencies between the port and starboard pods does not appear to limit the applicability of two-dimensional hydrodynamic calculations, while the use of potential flow theory underestimates heave and pitch damping for SLICE hulls.

Descriptors :   *SEAKEEPING, *SHIP HULLS, *SWATH SHIPS, COUPLING(INTERACTION), COMPUTATIONS, OCEAN WAVES, PITCH(MOTION), TWO DIMENSIONAL, DAMPING, THESES, RESONANT FREQUENCY, SEA STATES, HYDRODYNAMICS, POTENTIAL FLOW, BUOYANCY, POTENTIAL THEORY, HEAVING.

Subject Categories : Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE