ms N = 225 
o t) b 
3 Bieerec AR-11 
= 3 
c c 
5 5 
o w —4.00 
os Oo 
-5.00 
0.00 0.50 1.00 1.50 2.00 2.50 0.00 0.50 1.00 1.50 2.00 2.50 
FREQUENCY FREQUENCY 
POWER SPECTRUM OF WAVE HEIGHT 
-1.00 (b) 
N = 225 
ose AR-9 
oa o 
o 2 -3.00 
= = | 
> > 
c c 
io e 
oO oO 
es Ww -4.00 
n wn 
-5.00 
-6.00 
0.00 0.50 1.00 1.50 2.00 2.50 0.00 0.50 1.00 1.50 2.00 2.50 
FREQUENCY FREQUENCY 
POWER SPECTRUM OF HEAVING 
-1.00 (b) 
N = 225 
-2.00 AR-10 
-3.00 
4.00 -1.00 
oO 
Q -5.00 -2.00 
= 
2 
c 
Fs me 
oO o 
fe 6.00 OQ -3.00 
n = 
=) 
c 
e 
-7.00 4.00 
o 
-8,00 -5.00 
-9.00 -6.00 
0.00 0.50 1.00 1.50 2.00 2.50 0.00 0.50 1.00 1.50 2.00 2.50 
FREQUENCY FREQUENCY 
POWER SPECTRUM OF RELATIVE WAVE HEIGHT 
(a) NON-PARAMETRIC METHOD (b) PARAMETRIC METHOD 
(BT METHOD) (AR MODEL FITTING) 
(a) Nonparametric method (b) Parametric method (AR 
(B—T method). model fitting). 
Fig. 7.2. Examples of spectra of model seakeeping data. 
(From Yamanouchi, et al.46) 
229 
