船体運動からの波浪情報の推定について : 波スペクトル推定における非線形計画法の応用

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Needless to say, the accumulation of a reliable database of ocean wave characteristics is very important for safe ship design and navigation. Usually, such information has been collected from reports based on shipboard visual observations. On the other hand, a ship can be regarded as a type of wave recorder and, under the assumption of linear superposition, wave spectra can thus be estimated from measured ship motions. Based on this idea, the evaluation of one-dimensional wave spectra, as well as directional wave spectra, has been extensively carried out in recent years. However, when a ship is traveling with an advance speed in following seas, there is a range of the encounter frequency ω_e of the ship for which ω_e cannot be related to the wave frequency by a single-value transformation. Practically, this difficulty has been addressed by using an approximate method where only one solution ω of the relationship is retained by partitioning theω-axis. When one keeps the lowest-frequency ω solution, however, resulting spectra tend to be narrower and displaced towards low frequencies. In this study, we propose to design a wave spectrum by using a nonlinear programming method, in which a standard wave spectrum, such as the ISSC, is selected, and a significant wave height and average wave period are used as design parameters. The capability of this approach has been confirmed by comparing its results, based on the full-scale measurements of the motions of a container ship, with those from the so-called SMB method.
社団法人日本船舶海洋工学会の論文

船体運動からの波浪情報の推定について : 波スペクトル推定における非線形計画法の応用

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