Testing Ship Models in Transient Waves 



Fig. 21 - Phase angle be- 

 tween pitch-wave height, 

 heave -wave height, and 

 pitch-heave at zero speed; 

 transient test compared 

 with regular wave test 

 results 



120 



80 

 180 



120 



80 



0.2 0.4 0.6 0.8 1.0 



Frequency in eye /es per second 



1.2 



1.0 



.6 



.2 



AOO 



o<'0 



oQa 



"^o^' 



LEGEND 



A REGULAR WAVES - 

 o TRANSIENT TEST 





C'?, 



.2 .4 .6 .8 1.0 



Frequency in eye les per seeond 



Fig. 22 - Heave response for 

 Model 4889 in head waves at 

 a Froude number of 0.14; 

 transient test compared with 

 regular wave test results 



221-249 O - 66 - 35 



529 



