Hydrofoil Motions in a Random Seaway- 



Wave Frequency 



Wave Length 



Wave Orbital Velocity 



(^ - Irri ( r ad/ sec). 



\=i^ (ft). 



.,2 



= Z CD ( ft/sec). 



(3) 



(4) 



(5) 



Figure (v) 



Sinusoidal waves can be simulated by a second order system 



-z. = + -' z. (6) 



such that 



where t = time in seconds. 



(7) 



The horizontal and vertical components of the orbital velocities with these 

 waves are given by the following expressions: 



Vertical Component 



Horizontal Component 



u,„ = + a;Z„ cos cot 



(8) 



(9) 



631 



