非線形計画法を用いた方向波スペクトルの推定

概要

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It is well known that a ship can be regarded as a type of wave recorder and, under the assumption of linear superposition. wave spectra can be estimated from measured ship motions. However, when a ship is traveling with an advance speed in following seas, there is a range of the encounter frequency of the ship which cannot be related to the wave frequency by a single-value transformation. The method to overcome this difficulty has not been well-established, although the study has been extensively carried out in recent years In this paper, we propose to determine the directional wave spectra by using a nonlinear programming in which the ordinates of directional functions at an arbitrary encounter wave direction are design variables and the difference of estimated and measured cross spectrum is used as objective function. The capability of this approach has been confirmed by comparing the directional wave spectra estimated from the encouter waves measured on the towing carriage, with the ones obtained from the direct measurement of waves in the experimental tank.
社団法人日本船舶海洋工学会の論文
1999-09-04