Marsich and Merega 



was studied of the same parameters, assuming however several sea spectra and 

 several ship's lengths, so considering altogether 2592 cases (72 of which already 

 considered during the preceding investigation). 



Obviously the response operators have been calculated only once, and the 

 influence of sea spectrum and ship's length have been obtained by means of a 

 simple integration (see Sec. 2.5). 



1.3 Results of Systematic Calculations = > 



Results of systematic calculations are partially reported in tables contained 

 in the attached appendix and in Figs. 3 through 6. 



The result analysis leads to the following general conclusions for the types 

 of ships and conditions investigated: 



(a) bending moment coefficient c^ does not depend appreciably upon 

 ship's breadth; i.e., the wave bending moment is a linear function 

 of ship's breadth; 



(b) c^, Li and Fr being the same, c^^ is a linear function of p ; 



(c) the slope of the straight line c^ = f (p) is mainly and substantially 

 affected by Li and Fr , while variations of the parameter c^ only 

 produce parallel shifting of the same straight line; 



w — 



(d) although c is not a linear function of Cw 5 for values 0.80 < c 

 0.90 it may be approximately assumed that the variation remains 

 linear, provided that p , L/i , and Fr are kept constant. This may 

 be accepted owing to the flex point corresponding to c^ = 0.85 

 shown by all curves; 



(e) the function c^ = f(C^) is therefore practically a straight line, the 

 slope of which depends only upon L/i , while variations of Fr and p 

 produce parallel shif tings of the same line; 



(f) Cm increases for increasing values of L/i , according to a law very 

 close to a hyperbole, so that c is substantially a linear function 

 of the ratio i l ; 



(g) when increasing Fr , keeping c^ constant, c^ increases for low p 

 values and decreases for high p values. 



As far as sea spectrum and ship's length influence is concerned, it was dis- 

 covered that the bending moment coefficient depends only upon the ratio R = 

 L/\* and not separately and independently upon sea spectrum and ship's length 

 (see Sec. 2.5). 



824 



