Analyses of Multiple-Float-Supported Platforms in Waves 



By the Haskind-method (31,32] , one can also evaluate the 

 wave-exciting forces and moments by the radiated wave amplitudes ; 

 for the wave progressing to the positive end of the y-axis (Eq. 15), 

 the wave-exciting forces are 



R vBT (28) 



It is bo be noted that the wave -exciting forces and moments 

 presented in Eq.(28) are the resultant values. In other words, we see 

 by the Haskind-method that the exciting forces and moments on indi- 

 vidual bodies a or b cannot be evaluated. 



According to the theories by Haskind [33j and Maruo [34] , the 

 mean wave force K is determined by the diffracted wave 



I Pga 

 2 



K 

 T = 



A ( ° + e 



(29: 



NUMERICAL CALCULATIONS 



Added Mass and Damping Coefficients for Twin Cylinders 



Figures 15, 16 and 17 exhibit the various hydrodynamic forces 

 and moments on one of a pair of half-immersed circular cylindrical 

 bodies as functions of the frequency parameter J ^- . The definitions 

 of the various forces on this Body a are given in Tables 6, 7 and 8. 

 The hydrodynamic forces on Body b are evaluated by employing the 

 formulas in Table 10 with the aid of the information given in Fig. 15, 

 16 and 17. The resultant forces and moments on the twin Bodies 

 ( a + b ) due to the swaying, heaving and rolling motions are evaluated 

 by employing the formulas in Table 11 with the aid of the data in Fig. 15 

 16 and 17. 



817 



