Some Notes on the Higher Order Theory of Wave-Making Resistance : 2nd Report-Resistance Increase in Head Seas

Abstract

Resistance increase in head seas is investigated by the perturbation method. In this study, it is assumed that ships are of Michell type and the amplitudes of heaving, pitching, and surging are same order. The results are the following: (1) The linear theory is insufficient in the range of short wave length and the term of interference between incident wave and radiative or diffractive wave must be considered as in Maruo theory. But, in the range of long wave length, the former theory coincides with the results obtained in this study. (2) The effect of surging motion on resistance increase must be considered under the said assumption.