減揺水槽の不規則波中模型実験について

概要

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A navigation aids research vessel "Tsushima" of Maritime Safety Agency equiped with an anti-rolling tank has been constructed at Tamano Ship Yard of Mitsui Shipbuilding Co. At the design stage of the ship, performance test of the anti-rolling tank was conducted on a 1/28 scale self-propelled model at the Seakeeping Basin of Tokyo University. In this paper, results of model experiments in irregular seas are reported. In those experiments, the model was encountered with irregular waves which had simulated ITTC spectra for 10 m/sec and 15 m/sec wind speed, and motion of the model was measured by a data recorder. Spectral analysis as well as collation of amplitudes were conducted. Making use of analysed data, the effectiveness of the anti-rolling tank was evaluated by the following formula. Effectiveness = ((σ_φ/σ_w) without - (σ_φ/σ_w) with)/((σ_φ/σ_w) without) ×100(%) where σ_φ and σ_w are the square root of the variance of rolling amplitude and wave amplitude respectively, and with and without mean anti-rolling tank active and inactive respectively. Results showed that the tank was not effective in head seas, slightly effective in beam seas and considerably effective in following oblique seas. The maximum effectiveness of the tank reached about 50% which seemed to be a satisfactory result.
社団法人日本船舶海洋工学会の論文
1977-12-30