Devn 



m Coupling coefficient between surge and pitch equations 



x6 

 m Coupling coefficient between sway and roll equations 



r Metacentric radius 



s (t) Relative motion 



t Time 



x , y , z Cartesian coordinate system 



x , y , z Fixed cartesian coordinate system 

 o o o 



~x , y*\ z Unit vectors of O x y z 



IT , y , z Unit vectors of O x y z 



o o o o o o o 



Z C 

 Z G 



Position of center of buoyancy / O x y z 



Position of center of gravity / O x y z 

 j 



z i I 



C Position of center of buoyancy / baseline 



z' Position of center of gravity / baseline 

 G 



(t) Wave elevation 



P Half -wave amplitude (preferably to "wave amplitude") 



f Wave height 

 J w 



Pitch angle of buoy 



X Length of regular wave 



C Density of fluid 



cr Circular frequency of oscillations 



y? Roll angle of buoy 



r{^>] Righting moment in roll 



1078 



