Ochi 



Fig. 8 - Comparison between experimentally- 

 obtained histogram of slamming pressure 

 and predicted probability density function 

 (moderate Sea State 7, ship speed 10 knots, 

 light draft) 



histograms and the predicted probability density functions for various course 

 angles in a moderate Sea State 7, at a 10-knot ship speed. Figure 11 shows a 

 similar comparison for various loading conditions. The prediction curves were 

 established by using the values listed in Table 2, and a threshold velocity of 

 12 ft/sec. Satisfactory agreement between the prediction curve and the experi- 

 mental histogram can be seen in these figures. Based on these results, it is 

 concluded that the impact pressure associated with slamming follows a trun- 

 cated exponential probability law. 



PREDICTION OF THE TIME INTERVAL BETWEEN SLAMS 

 Prediction of the Time Interval Between Successive Slams 



For prediction of the time interval between successive slams, the following 

 question must first be answered: is the slamming phenomenon a sequence of 

 events occurring in time according to the Poisson process ? If the occurrence 



562 



