DENSITY IN DB 
DENSITY (x10!) 
GAIN (IN DB) 
POWER SPECTRAL DENSITY 
INPUT: 1 WAVE 
-20.00 
40.00 
-60.00 
0.00 1.00 2.00 
FREQUENCY 
CROSS SPECTRAL DENSITY 
REAL PART 1 2 
0.05 
0.03 
0.00 
0.00 1.00 2.00 
FREQUENCY 
FREQUENCY RESPONSE FUNCTION 
INPUT: 1 WAVE 
OUTPUT: 2 HEAVE 
N=250 
10.00 
-10.00 : | | | 
-30.00 
0.00 1.00 2.00 
FREQUENCY 
POWER SPECTRAL DENSITY 
OUTPUT: 2 HEAVE 
-20.00 
o 
(=) 
Zz 
= «0.00 
no 
z 
w 
3) 
60.00 
0.00 1.00 2.00 
FREQUENCY 
CROSS SPECTRAL DENSITY 
IMAG. PART 1 2 
-0.04 
rc) 
fest 
z= -0.02 
a 
z 
w 
oO 
0.00 
0.00 1.00 2.00 
FREQUENCY 
54.00 
= 18.00 
© 
fat 
o 
w 
a 
w 
n 
< -18.00 
= 
a 
-54.00 
0.00 1.00 2.00 
FREQUENCY 
1.00 
uw 
c 
Ww 
= 
: Pe 
is) 
0.00 
0.00 1.00 2.00 
FREQUENCY 
Fig. 7.14. Frequency response analysis for heave by AR—model fitting 
(N=250, At=0.2 sec, AR-8). 
(From Oda, Yamanouchi, et al.59) 
241 
