Floating Body in Irregular VJaves 



0.4 



0.3 



0.2 





0.1 



0.5 



1.0 

 0) in rad. sec." 



1.5 



2.0 



2.5 



Fig. 15. Spectral density function of a half times the 

 square of the wave height 



value of the low-frequency energy variation and the characteristics 

 of the waves becomes 



(T^ _. ,, = constant 

 E diff 



~2 



Figure 17 shows that the produced wave spectra fit this relation quite 

 well. 



Now the exciting force must be determined keeping the vessel 

 in a fixed position. In that case the exciting force is due to wave 

 reflection alone. In regular head waves this force is 



F- = iPga^B sin^Qf 



975 



