Prediction of Ship Slamming at Sea 



10 



where 



(32) 



Rl 



■1/10 - 1/ < - [—2} l°gll^) - q. 



The derivation of the above formulae is the same as that for the average of 

 the one-third highest and one-tenth highest slamming pressures. 



Figure 19 shows a comparison of the theoretical probability density function 

 of pressure experienced on deck due to green water with an experimental histo- 

 gram. The experimental histogram was obtained from tests on the MARINER 

 operating at a 10-knot speed in a moderate Sea State 7. Included also in the fig- 

 ure are the averages of the one-third and one-tenth highest pressures. 



Another comparison between theory and experiment was made for a high 

 speed research ship form and the result is shown in Fig. 20. This form is one 

 of the Series 64 family having a block coefficient of 0.45. The freeboard at the 



30 



20 



10 



4 6 8 



Pressure in PSI 



Fig. 19 - Histogram of pressure ex- 

 perienced on the deck due to green 

 water (MARINER, moderate Sea State 7, 

 ship speed 10 knots, full draft) 



221-249 O - 66 - 38. 



577 



