Effects of Sway Frequency and Hull Length on the Hydrodynamic Force and Moment Derivatives for the Axi-Symmetric Bare Hull of an Underwater Vehicle

In the present research, two sets of data were analyzed for the purpose of obtaining the oscillatory derivatives of the sway force and yaw moment with respect to the sway velocity and sway acceleration. The results of the analysis show that the values of the derivatives which were calculated from the dynamic test data are somewhat different from the values of the same derivatives which were calculated from the static yaw test data. Moreover, the test data from the dynamic manoeuvres show that the values of these derivatives depend both on the frequency of the forced oscillations and hull length.