SEAKEEPING CONSIDERATIONS IN A TOTAL 
DESIGN METHODOLOGY 
Chryssostomos Chryssostomidis 
Massachusetts Institute of Technology 
Cambrtdge, Massachusetts, U.S.A. 
ABSTRACT 
A procedure leading to the prediction of seakeeping 
qualities of monohulls in a seaway is briefly re- 
viewed. The two parameter conformal represen- 
tation of hull sections is described and compared 
with the close-fit representations. 
A proposal for incorporating seakeeping conside- 
rations into a total ship design methodology with 
particular emphasis on the identification of the pro- 
blem areas and design indices associated with sea- 
keeping is made. The advantages and limitations of 
the two parameter representation are discussed. 
The optimization criterion, constraints, and opti- 
mization scheme used in conjunction with the pro- 
posed design methodology are discussed and illus- 
trated by an example. 
I - INTRODUCTION 
Attempts to improve the methodology for designing large 
ocean based systems such as ships have recently appeared in litera- 
ture, e.g. References 1 and 2. The approach proposed in both these 
references has retained the iterative nature of the traditional solution 
method but it has attempted to introduce most of the factors that can 
influence the overall configuration of the ship as early in the design 
cycle as possible. 
In order to do so the proposed approach requires that the 
largest possible number of alternatives be examined at the outset of 
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