Abstract
A technique for the evaluation of the seakeeping performance of destroyer-type ships is presented and applied to four radically different hypothetical ship designs. The procedure involves first the determination of the responses of the four ships to realistic North Atlantic sea spectra, using linear superposition techniques, and assuming the vessels are in short-crested, irregular head seas. Calculations are based upon theoretical response amplitude operators obtained by applying strip theory to determine the response of the vessels to regular waves. The final evaluation is then obtained in the form of long-term probabilities of not exceeding stated numerical indices of performance as functions of ship speed.
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