短波長波中における大型船の船側内外に働く変動荷重

抄録

Recently it is reported that in spite of a small ship motion, the damage at the large ship's side shell near by free surface occured. It is considered that which is because of fatigue of the structual member in oblique short waves length. This hydrodynamic pressure acting on ship's side can be estimated by using strip method, however in the case of short waves length, an another simple theory can be proposed. When onsidering hydrodynamic pressure acting on the side shell near by free surface, the profile of hydrodynamic pressure is partially criped because of exposure of the point of the side shell to the air. The variance of load at this point is very different from the result analysed by liner theory which value effects on the fatigue strongly. Hence by using the liner theory, the short and long term prediction of load does not give valid result. This paper shows a simple method to estimate hydrodynamic pressure acting on the side shell near free surface, and that the way for treating non-linear loads like cripped profile is very important in considering hydrodynamic loads distribution.