Study on Lateral Motions of a Ship in Waves by Forced Oscillation Tests,

摘要

The coefficients of equations of motion were determined by the forced oscillation technique,as a step of improvement of the calculation of lateral motion:namely,sway,yaw and roll,of a ship in waves. The effects of frequency,advance speed and bilge keels on ship motions were clarified experimentally. The experimental values were compared with the calculated ones by the strip method. For the main terms of sway,yaw and roll,except roll damping terms,the both show fairly good agreement. For the coupling terms of sway-yaw,yaw-roll and roll-sway,the both also show comparatively good agreement. It is pointed out that some proper method should be developed for the approximation of the effects of viscous damping,advance speed,bilge keels and frequency of motion to obtain better prediction of the roll damping term. (Author)