This paper proposes some new criteria for seakeeping performance of naval submarine seaworthiness behavior. For ships, there are twelve criteria for seaway performance analysis. The scope of mission, systems and device’s restrictions, hull shape, hydrostatics and stability properties of ships and submarines are essentially different. In snorkel condition, only snorkel mast is above the water surface. In submerged condition, the submarine is far from the sea surface and ocean waves so that seakeeping is not important and is not discussed. Seakeeping criteria for several kinds of ships such as merchant and Naval ship, single hull and multi-hull ships with different operations, are separately defined but there had not been any obvious criteria for submarines specially for Naval submarines. This paper, by a restatement and review on twelve criteria for ships, proposes some new criteria for naval submarines. These criteria are separately presented for surface condition and snorkel condition because the missions and operational systems, propulsion system, stability condition, draft and wave moments in these two conditions are different. Thus, there are two separate criteria for two conditions. Methodology in this paper is based upon the experiences of authors and a group of specialists in submarine design, and test in the sea, a knowledge on the submarine devices and systems. Computer modeling of seakeeping is performed in Paramarine and Flow Vision software.
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