Towed Ship Motion Test in Directional Spectrum Waves in a Long Tank (Part 3)

概要

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As a sequel to our previous reports on tank testing results of ship motions in directional spectrum waves this paper discusses the applicability of motion test results to estimate transfer functions of motions for various wave encounter angles. As we have observed in our previous reports that in many cases, especially in head sea condition, theoretical estimation of motion spectra do not agree so well with experimental results, estimation of true magnitude of transfer functions becomes a necessity. In the present study a practical method of estimation has been discussed and short term prediction of motions over various range of wave periods has been carried out with the estimated transfer functions. The prediction shows good agreement with experimental results. Results of long term prediction in Winter North Atlantic have also been presented. This paper also discusses the possibility to extend Maximum Likelihood Method (MLM) to estimate directional encounter wave spectra analyses of which is necessary for reverse calculation of transfer functions of motions.
社団法人日本船舶海洋工学会の論文