ANALYSIS OF SHIP-SIDE WAVE PROFILES, 

 WITH SPECIAL REFERENCE 

 TO HULL'S SHELTERING EFFECT 



Kazuhiro Mori, Takao Inui, 

 and Hisashi Kajitani 



University of Tokyo 

 Tokyo, Japan 



ABSTRACT 



Attempt is made to find out the effective wave- 

 making source of a ship from the measurement of 

 the hull- side wave profiles. 



The integral equation of the source distribution 

 function is simplified and solved numerically under 

 the specific limitation, (a) rectangular, vertical 

 central plane, and (b) draughtwise uniform. 



Two Inuid models M 20 (B/L = 0. 0746) and M 21 

 (B/Ij = 0. 1184), whose hull-generating sources are 

 optimized to give the minimum wave resistance at 

 Fn = 0. 2887(K Q L =12), are tank-tested and wave- 

 analyzed. 



The obtained source distribution m( £ ) shows a 

 clear discrepancy from the hull-generating source 

 m( £ ) in a similar way to the so-called i* -correc- 

 tion, or 



«({) = m(« )/mU ) = 1 -M(l- |t|), (M= 0.4) 



Wave profiles, wave patterns and wave - making 

 resistance are calculated in two ways, (a) from 

 hull-generating source m( £ ),and (b) from wave- 

 analyzed source m( £ ). 



The gap between experiment and calculation (a) 

 is satisfactorily filled up by calculation (b). 



From experimental results it is proved that the 



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