On Eddy Making Component of Roll Damping Force on Naked Hull

Ikeda revisited

“…The calculations consider the hull ig. 5 Illustrating the forward velocity U , the draft D, the roll velocity ̇ , the distance from the waterline level to the vertical centre of gravity OG , the effective lever l 0 where the local angle of attack is 0 and the effective lever for the lift force l R below the water surface only. In the calculations the hull is given a small yaw angle (angle of attack) towards the water flow.…”

“…Ikeda's method [4][5][6][7][8][9][10][11][12] is the most established semiempirical formulation for roll damping estimation of large vessels and is recommended by ITTC [13]. Ikeda's method is also used as input for vulnerability assessment for parametric roll in the 2nd generation intact stability criteria [14].…”

An optimal bilge keel design to reduce the rolling of the offshore large purse seiner

“…국내 선망선은 구조적으로 횡동요에 취약한 점을 가 지고 있다 (Ikeda et al, 1976(Ikeda et al, , 1977a(Ikeda et al, , 1977b(Ikeda et al, , 1990, 또한 그 방법을 보다 진전시킨 횡동 요 감쇠에 대한 연구가 있다 (Himeno, 1981) 횡동요 감쇠계수 는 자유횡동요시험 (free rolling test) …”

Numerical Research of the Viscous Effect of the Bilge Keel on the Damping Moment

“…Because of the complexity of the viscous flow, nonlinear rolling motion is researched mainly by model test and empirical formula for a long time.Parametric excitation for rolling motion is used in 1861 by Froude [6], and it is still under using by the researchers. Later, in 1977, Ikeda et al [8] developed an empirical method to predict the roll damping according to a series of model experiments. Both these potential theories appeared weakly in the application until 1998, Yeung et al [34] proposed a composite roll moment equation to address separately the wave damping and the viscous damping related to flow separations, and the viscous effect captured the attention of the researchers.…”