Statistical Analysis of Ship Encounter Waves : Application of Rayleigh Distribution to the Measured Wave Height

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  • 遭遇波浪の統計量について : レイレイ分布への当てはめ
  • ソウグウ ハロウ ノ トウケイリョウ ニ ツイテ レイレイ ブンプ エ ノ ア

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Abstract

In order to clarify the hull response of fishing boat encountering ocean waves, it is essential to understand the wave characteristics. For this purpose, we measured the wave height and hull response in the actual sea, and the time series data reached into 5,000 cases. In this paper, the data were analyzed statistically. The maximum and minimum values of wave amplitudes divided by the standard deviation σ of surface elevation are nearly equal to the values estimated by using Rayleigh distribution as well as double amplitudes. The same results are obtained on the pitch and roll motions, too. On the stress, it is confirmed that the values of sagging condition are larger than the hogging in the same sea states. On the other hand, the analyzed values of the highest 1/100 wave amplitudes and the ones of maxima and minima of pitch amplitudes from measured data are larger than the estimated by Rayleigh distribution.

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