STRIP THEORY AND POWER SPECTRAL 

 DENSITY FUNCTION APPLICATION TO 

 THE STUDY OF SHIP GEOMETRY AND 

 WEIGHT DISTRIBUTION INFLUENCE ON 

 WAVE BENDING MOMENT 



Sergio Marsich 

 Genoa University 

 Genoa, Italy :.-. 



and 



Franco Merega 



Registro Italiano Navale 



Genoa, Italy 



FOREWORD ::n;c.. 



In this paper, research is described which was carried out by means of a 

 large electronic computer with the aim of detecting which parameters affect the 

 wave bending moment of a ship and thereafter to evaluate their quantitative 

 influence. 



The present research may have some importance especially for ships as 

 bulk- carriers and tankers for which there is actually a trend to larger and larger 

 sizes and for which the influence of certain parameters, weight distribution, for 

 instance, may be of paramount importance from the point of view of the longitudi- 

 nal strength in confused sea. For this reason the choice of the types of hulls 

 and weight distributions adopted for this study was oriented to such kinds of 

 ships. 



The work is based upon the theory of Korvin-Kroukovsky (KK) and the abso- 

 lute values obtained for bending moment are obviously comprised between the 

 accuracy limits of the above theory, which can be deemed sufficient in most of 

 practical cases. However, at least from a qualitative point of view, the param- 

 eter identification remains valid, as well as the exclusion of the influence of 

 other parameters, that have also been taken into consideration. 



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