Title :
Mathematical Modeling of Ship Speed-Loss Due to Wind and Seas
Author_Institution :
Shanghai Ship and Shipping Scientific Research Institute, Shanghai, China
fDate :
Sept. 28 1987-Oct. 1 1987
Abstract :
The design of an ocean-going vessel and the determination of routes and schedules for the operation of that vessel involves some prediction of the vessel´s performance in a given wind and sea state. Theoretical studies and tests in tow-tanks have not been able to model the speed-loss suffered by a vessel in very rough seas. This is partly because a major component of speed-loss is the voluntary reduction in speed to reduce the violence of a ship´s motions. A reasonable approach to the modeling problem is to develop a general expression for ship speed-loss incorporating factors for hull-type, propulsion, wave height and relative wind and wave direction. The value of each of the coefficients in the expression can then be determined by analyzing empirical data from actual cruises. A mathematical expression based on nearly 5000 data points from 11 cruises of the bulk cargo carrier Mei Qui Hai is able to match the empirical curves to within a fraction of a knot for sea states ranging from dead calm to wave heights of 9 meters.
Keywords :
Fluid dynamics; Fuels; Genetic expression; Marine vehicles; Meteorology; Oceans; Propulsion; Testing; Weather forecasting; Wind forecasting;
Conference_Titel :
OCEANS '87
Conference_Location :
Halifax, NS, Canada
DOI :
10.1109/OCEANS.1987.1160810