5. Towed Ship Motion Test in Directional Spectrum Waves in a Long Tank (Part 1)

概要

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Recently the techniques of generating short crested waves with arbitrary directional spectrum have been developed, and some experiments were conducted in such waves. However, ship towing or running tests in such waves have not been conducted yet, because sufficiently uniform wave area could not be obtained. This paper reports ship motion test in towed condition (Froude numbers are 0.2 and 0.275) in long tank by generating uniform irregular waves with arbitrary directional wave spectrum, and describes the comparison between analyzed and theoretically estimated results. The compared results show relatively good agreement. For this experiments, a snake type wave maker was newly developed and installed at the end of the long tank of Yokohama National University. For the analysis of directional wave spectrum, we adopted so called Maximum Likelihood Method. Theoretical estimation is made by using analyzed directional wave spectrum as input wave and also using directional motion transfer functions calculated by so-called New Strip Method.