On the Slamming of a Ship

The phenomenon of the slamming is investigated from the points of view of the ship's motion and hydrodynamics and it is found that the slamming ordinary experienced is caused by pitching, not by heaving. The slamming factor n.i.e. the maximum impulsive pressure due to slamming divided by the hydrostatic pressure due to load draft, can be expressed by equation (11), where P(σ) depends on the speed and the position of the section where slamming occurs, and tanβ on the form of the bottom of that section. Many facts already known about slamming by experience can be clearly explained by (11). Maximum value of n can arrive at about 13 if improper bottom form be adopted. Some suggestions about the form of the forward bottom in order to avoid slamming are also given in Fig. 3 and 13.