Accession Number : ADP003829

Title :   Comparison of Theoretical Seakeeping Predictions with Model Test Results for a Wide Beam Fishing Vessel,

Corporate Author : NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO)

Personal Author(s) : Karppinen,T. O.

Report Date : AUG 1983

Pagination or Media Count : 18

Abstract : Motion transfer functions and phase lags computed by linear strip theory for a very wide and short fishing vessel are compared with model test data and theoretical results determined by the three-dimensional, linear sink-source method. Results are presented for beam waves at zero speed and for head seas at the trawling speed and at the top speed. Heave in head seas is predicted by the strip theory equally well for this wide beam vessel as for more slender, ordinary hulls. Problems arise in pitch prediction, particularly at the higher speed. Roll computed by a new strip theory computer program is in close agreement with experimental roll data. The theory gives either a much better or at least equally good fit to the model test data than the three-dimensional method. (Author)

Descriptors :   *Ship motion, *Ship hulls, Width, Mathematical prediction, Hydrodynamic characteristics, Water waves, Directional, Head on orientation, Sides, Heaving, Roll, Pitch(Motion), Transfer functions, Seakeeping, Computerized simulation, Model tests, Ships, Commercial fishing

Distribution Statement : APPROVED FOR PUBLIC RELEASE