2. Prediction of Propeller Cavitation Noise and Its Comparison with Full-Scale Measurements

概要

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Propeller cavitation noise predicted both from theoretical calculation and from model experiment are compared with full-scale measurements performed on two ships, a cargo liner and a training ship. The tonal noise presenting discrete frequencies consisting of propeller blade frequency and its harmonics-associated with volumetric fluctuation of total cavitation bubble volume-and the broadband noise-associated with random growth and collapse of individual cavitation bubbles-are caused by different mechanisms. For this reason they should be treated separately in the theoretical and experimental prediction procedures. In model experiment, the principle of acoustic-mechanical formula is applied for estimation in low frequencies. Full-scale measurements on actual ships were conducted to acquire far-field noise and to eliminate extraneous noise reflected from sea surface. The comparison between predictions and full-scale measurements has shown good agreement enough to prove that the present methods of cavitation noise prediction are valid for practical purposes.
社団法人日本船舶海洋工学会の論文