A Study of Ship Motion Stabilization 



A4- 





OJ. =\/^ ZERO RESPONSE FREQUENCY 



Ws =/|; NATURAL FREQUENCY OF TANK WATER LEVEL 



Figure 2 



In Fig. 3, the magnification factor of the response of the tank water level is 

 plotted against the frequency. Two solid lines show the solution of the Eq. 1 for 

 A/ a = 4.17 and 6.52. It can be seen that the smaller the openings, the less re- 

 sponse. Plots are made of the experimental values. There are some disagree- 

 ments with the theory, but, if the damping coefficient is doubled, i.e., the effec- 

 tive area of the openings is reduced to 7/10, the theoretical values agree very 

 well with the experimental data. 



AMPLITUDE OF THE TANK WATER 



z 



0.5 



5 oj-k 

 Figure 3 



U),m 



Jil ^ 



805 



