船載型船体動揺解析システムの開発-I

概要

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Instantaneous cross spectrum analysis based on the T-VVAR (Time Varying Coefficient Vector Auto Regressive) model is a powerful tool for on-line analysis of nonstationary ship motion data. In order to obtain the stable results, the trend model and the time varying variance model that evaluate constantly varying mean value and variance are applied. Using these models, the measured time series data are normalized. Using the normalized data, an on-line procedure for estimation of the stable instantaneous ship motion cross spectrum is proposed. In order to examine the reliability of the proposed procedure, onboard tests were carried out. Under the stationary conditions, on the constant speed and course, the proposed method shows good agreement with the stationary time series analysis. Moreover, it is shown that the proposed procedure can deal with nonstationary data and estimate the stable instantaneous ship motion cross spectra.
社団法人日本航海学会の論文
2002-03-25