0.06 
Ly 
0.02 
illu. 
“il 
0 | ae 
! 
Fig. 11.4. Coefficients L, of linear resistance impulse response function. 
(From Dalzell.55) 
Here ag, is the nondimensional encounter frequency o, = w,./w,, where w, is the 
frequency of the wave with length equal to the model ship length L, i.e., where 
@, = | 27g/L. The added resistance and wave height are also nondimensionalized by 
the displacement and the length of the model. Figure 11.5 shows the special case of 
H7(@,@2) whenw; = w,@2 =—w. The term H>(w,—w) is expressed by Eq. 11.63, and 
the results obtained in regular wave tests are also shown. The agreement is excellent. 
100 
oO SEA STATEA 
x SEA STATE B 
SEA STATE C 
80 
= 60 REGULAR WAVE 
ENVELOPE 
iS 
© 40 
* 20 
0 
0.5 d 3 2.0 
Fig. 11.5. Estimate of G2(o.,-0.) from cross—bispectral analysis, Fn = 0.15. 
(From Daizell.5) 
310 
