Auto-osoillations of Anchored Vessels 



a ■ w (1 > 



below the ground level. Here T denotes the horizontal component of 

 the anchor chain tension and W is the weight per unit length of the 

 chain submerged in water. 



Besides, the following designations are also used in this 



paper 



j 3 and f = mass density of water and air, 

 o 



g = acceleration due to gravity, 



/_, = length between perpendiculars, 



A = lateral area of the underwater body, 



Q = sail area, 



m = own mass of ship, 



X and X = longitudinal and transverse added mass, 



J = ship's mass moment of inertia for cen- 

 tral vertical axis, 



X = added mass moment of inertia for the 



66 



same axis, 



V = wind velocity, 



V = flow velocity, 



a 



o 



angle between wind and flow directions, 



CA = center of sail area, 



t = abscissa of CA, 



^s 



£ and V - hawse-hole coordinates in the body 



hh hh coordinate system £ 77 , 



1081 



