THE EXCITING FORCES AND WETTING OF SHIPS IN WAVES

General formulas are established for the exciting forces and moments acting on a ship in arbitrary waves. It is shown that for the diffraction of waves due to isolated singularities, such as sources, dipoles, pressure points, etc., the exciting forces and moments depend only on the ship's radiation functions, which characterize the wave radiati n in a heavy fluid due to forced oscillations of the ship with unit velocity amplitude in calm water. In the case of diffraction of regular progressive wave systems, it is shown that the exciting force and moments, the damping coefficients, and the estimated wetting of ships in waves can all be expressed in terms of the asymptotic characteristics of the radiation functions. The general results obtained are employed to calculate the exciting forces and moments in specific examples. (Author) Translation from Izvestia Akademii Nauk SSR Otdelenie Teknicheskikh Nauk, no. 7, pp65-79, 1957.