Damping Forces in Vibrations of a Ship

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Since in the case of a ship the surrounding water is seemingly so deformable that the dissipation of vibrational energy of that ship in the form of radiating waves is hardly possible, the reason why ship vibrations shall actually be damped not slightly, is as a matter of fact difficult.<BR>There are at least four possible causes of damping in ship vibrations, namely, (1) the water friction, (2) generation of pressure waves, (3) generation of surface waves, and (4) the structural damping force. Air damping is obviously out of consideration.<BR>The solution of the problem was obtained mathematically for the case of flexural vibrations under an unbalanced force, its result being compared with reliable experimental data, so as to determine what kind of force is the most plausible one for the damping of the ship vibrations.<BR>In the case of a ship of shallow draught the generation of surface waves is the primary cause, whereas in the case of a ship with full load and deep draught the effective structural damping resistance becomes the cause under consideration.<BR>The details of the problem as well as its theoretical treatment will be described in Appendix towards the end of this paper.
社団法人日本船舶海洋工学会の論文