8. On the Accuracy of the Strip Theory Used in Calculating the Ship Motions in Waves

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It is well known that the strip theory is based on many assumptions. Of those, three-dimensional effect, advance speed effect, viscosity effect, section-shape effect and finite water depth effect are studied in this paper, and their correction coefficients are given. The accuracy of the strip theory are examined by comparing the responces, with and without correction, of the ship in regular head seas. The effect of viscosity and section-shape may be practically ignored. But three-dimensional effect and advance speed effect are rather large over the wide range of λ/L. There is little effect on hydrodynamic forces and on ship motions when water depth-ship length ratio h/L is greater than 1, but when h/L is less than 0.5, they are affected by the finite depth, and computed ship motions show a little decrease compared with those of infinite depth.
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