1.0 



-l« 



Wave Excitationless Ships Forms 



Strut breadth Bi 

 Strut breadth B^ 



■X— Combined 7" = 2 

 ■^ — Combined "^ = ^ 



az 



0.4 



OJS 



-f' 



Fig, 16 - Heaving force of a double caisson type model 



Fig. 17 - Geometry of 

 sphere type models 



three-dimensional case provided adequate values for 7 are chosen, the amplitude 

 of heaving force of such a body is calculated by Eq. (2) as shown in Fig. 18. 



Heaving-force measurements have been made of models with the following 

 sizes: a =14.3cm, D =a and \fJa, T = 1.5a and 2a. A typical record obtained 

 is shown in Fig. 19 which shows almost the same tendency as the two- 

 dimensional case shown in Fig. 6. 



In Fig. 20, heaving forces for different depths are shown. Reasonable 

 agreement with theoretical calculations will be noticed. 



397 



