3. Analysis of Waves Generated by a Ship Oscillating and Running on a Calm Water with Forward Velocity

概要

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Wave analysis is proposed for deriving the spectrum of the unsteady wave pattern, which is generated by a ship forced to oscillate and simultaneously running with a constant forward velocity, from wave elevations measured along a line parallel to its course. The final purpose of this wave analysis is to check the validity of the theoretical predictions in the unsteady velocity potential field around a ship when it moves in waves. The measurement of the unsteady wave pattern around a ship is difficult compared with that of the stationary wave pattern. A new wave measuring system is invented providing us with sufficient information from the tank test to make it possible to carry out the analysis of the unsteady wave pattern. From the results of the wave analysis of the measured radiation wave pattern compared with the theoretical prediction we can conclude that Ogilvie-Tuck's slender body theory predicts fairly well the spectrum of radiation wave pattern. This fact means the far field velocity potential can be predicted even in minute details by the theory. A little interaction effect between stationary and nonstationary waves are observed.
社団法人日本船舶海洋工学会の論文