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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This paper attempts to apply presently available knowledge of ship model behavior in regular waves to the prediction of trends of ship performance in realistic irregular wave patterns. Performance is studied in the terms of tendency to ship water forward and to slam, and of magnitude of heaving accelerations. The variables of particular interest considered are severity of sea, ship speed, ship heading, and hull proportions. It is believed that the trends obtained in this exploratory project should provide the naval architect with some guidance in the selection of basic hull characteristics for one particular type of ship (in this case, the single-screw dry-cargo ship). The results should also be of assistance in planning further systematic research.