Mori 3 Inui and Kajitani 



design procedure where a ( £ ) is taken into ac- 

 count is very significant. 



The second order calculations for hull - surface 

 condition as well as for free-surface condition are 

 found not enough to give the theoretical basis for 

 the correction function a ( £ ), which suggests the 

 importance of the hull's sheltering effect. 



I. INTRODUCTION 



The wave analysis has two objectives, i. e. (a) to deter- 

 mine wave -pattern resistance directly, and (b) to find out the actual 

 wave -making mechanism of a ship-like floating body. 



This paper deals with the problem (b) by means of the 

 measurement of ship- side wave profiles rather than by free wave pat- 

 terns in the rear of ships. 



II. METHOD OF ANALYSIS 



The co-ordinate system as shown in Figure 1 is adopted 

 throughout the papers. 



All quantities in the following equations are dimensionless, 

 where * ( = L/2), half length of the ship, and U, the velocity of the 

 uniform flow are taken as the units of length and speed, respectively. 



Let us assume that the hydrodynamic singularity (source) 

 is distributed on the surface 



*= ■ i ( * , r ) (^ 



Then the perturbation velocity potential at an arbitrary con- 

 trol point P(x, y, z) is given by 



</> (x, y, z) = — / / m(£ , r ) G(x, y, z ; £ , v , f ) dS 



k 



(2) 

 688 



