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The definition of the radiation efficiency is very important to estimated underwater radiated noise of a ship. Considering the structure of the ship, it can be found that the hull of a ship consists of a lot of plates supporting by longitudinal and transverse stiffener. Therefore, various modes of the hull vibration occur related to the combination of these plates including stiffeners. In this paper, the method to define the radiation efficiency is suggested considering the vibration mode of the hull based on Uchida`s experimental equation of the radiation efficiency. The suggested method is verified by the experiments with various kinds of naval vessels.

Estimation of the Sound Radiation Efficiency of the Hull Considering the Type and Natural Frequency of Plates of It