Abstract
The computer program TRIAL has been used to determine the seakeeping qualities in head waves of systematically varied ship forms. Nine variants of the Todd Series-60 model were developed having the same midship section coefficient, length/oblique beam ratio (L/B = 7) and length/draught ratio (L/T = 17.5). The ship form parameters which were varied were the block coefficient, the longitudinal position of the centre of buoyancy, and the forebody section shape. A ship length of 200 m was chosen as the since in fully developed seas, waves of this length contain the highest energy and attain the highest amplitude. An investigation of the influence of the weight distribution and variation of the sea condition has been carried out for this central value. The results show that pitching especially decreases with ship length, while heaving increases with speed. For V-shaped forebodies the heaving motion is strongly reduced, while there is an advantage in respect of added resistance up to a certain ship length, which depends on speed and sea-condition. Above this length, U-shaped sections are preferable.
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