5.5 

 5.0 

 4.5 

 4.0 

 3.5 

 3.0 

 2.5 

 2.0 

 1.5 

 1.0 

 0.5 



0.0 



BOARD SPECTRUM 



- SIMULATED 



- DESIGN 



0.0 



0.5 1.0 



Frequaney (Hz) 



H' = 0.458 ft 

 f p = 0.571 Hz 

 a, = 0.07 



1.5 



11.0 

 10.0 

 9.0 



a.o 



7.0 

 6.0 

 5.0 

 4.0 

 3.0 

 2.0 

 1.0 

 0.0 



1 1 1 1 1 .. 1 1.1. .1 1 



1 — ' — ' — ' — i — ' — ' — ' — ' — r— 



WATER SPECTRUM - 



- SIMULATED 



- DESIGN 



u 



. . . . rrv> 



0.0 



0.5 1.0 

 Frequency (Hz) 



= 1.25 ft 

 = 3.3 



ct h = 0.09 



1.5 



Figure 28. Spectral shape of irregular wave signal used to 

 control wave board and predicted shape of water surface 

 spectrum. (a L and ct h are low- and high-frequency spec- 

 tral width parameters, respectively) 



f p = 1/Tp , the spectral width parameter a , and the spectral peak 

 enhancement parameter G . 



119. Peak deepwater wavelength (Lp) and significant deepwater wave 

 height (H s ) were calculated using linear wave theory with T p and H s 

 measured in the horizontal section of the tank as input . Wave data were 

 collected and analyzed for 500 waves for the irregular wave tests. Table 9 

 lists design parameters for the irregular wave tests. 



Table 9 

 Irregular Wave Test Design* Parameters 





Parameter 1 





(H s /Lp) 



T 

 sec 



K 

 ft 



0.078 

 0.044 

 0.03 



1.00 

 1.50 

 1.75 



0.37 

 0.47 

 0.45 



Parameter 2 



P* 

 deg 



20 



Parameter 3 



Pi 



deg 



5 

 10 

 15 



Nominal values for design purposes which were only approximated. 

 Hg = significant wave height in horizontal section of task. 



