This note presents a summary of the information and techniques which are available to the designer for predicting the levels of service vibration of a ship in the design stage. This involves the two phases of estimating the exciting forces and the vibratory response of a hull to given forces. It is emphasized that at present the reliability of such predictions depends on the availability of data on the levels of service vibration or the exciting forces for ships actually in operation as a standard of comparison. It is pointed out that the concept of mechanical impedance at the stern of a ship is useful in predicting forced vibration.

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