Motion and Resistance of a Low-Waterplane Catamaran 



PV 



b/a = 2 



OSCILLATION AMPLITUDE 



EXPERIMENT: 



• 0.25" 



■ 0.5" 

 THEORY: 



TWIN CYLINDERS 



MONO CYLINDER 



pVoj 



1.0 1.5 



cj 2 a/g 

 a. Added Mass 



1.0 1.5 



cj 2 a/g 



b. Damping 



pV 



WITHOUT DECK 



WITH DECK 



i_J I I I I I I I I I L 



0.5 1.0 1.5 2.0 2.5 



co 2 a/g 



c. Added Mass 



0.4 0.8 1.2 1.6 2.0 2.4 2.I 



w 2 a/g 



d. Added Mass tf a Rectangular Cylinder 



Figure 3 Two-dimensional heave added mass and damping 

 coefficients. 



507 



