PRESSURE 

 GAGE 



A Survey of Ship Motion Stabilization 

 FORWARD 



I. 



18 



3 -2 



37' 



2 -2 



PRESSURE 

 GAGE 



SHIP AND TANK 

 (a) Top view 



9 -6 



16 



DESIGN WATER DEPTH (5' "G") 



TANK BOTTOM AT 01 LEVEL 



T~ 



18-2 ( TRIAL VALUE ) 



SHIP CG 

 (b) Side view 



Fig. 3 - Sketch of principal dimensions of tank system 



Tank tuning experiments were conducted over the three-day period in the 

 several seas encountered and while the results of these experiments as plotted 

 in Fig. 6 indicate that an optimum water depth had not been achieved, it would 

 appear that 6.5 feet of water yields a reasonable operating condition. Figure 7 

 presents the effect of sea angle encounter. The sea spectra curves presented in 

 Fig. 5 indicate extreme variations in sea conditions and consequently, the test 

 results presented by Fig. 7 cannot be interpreted as indicative of representative 

 trends without extensive interpolation between sea spectra. 



757 



