Pages 37-43
Ship hull form improvement is tried by means of Mathieu function expansion method for amplitude functions obtained from wave pattern analysis test. Components of wave pattern resistance are calculated from the obtain coefficients of the Mathieu function expansion. The direction of reforming the mother ship is to substruct the components of the sectional area curve corresponding to the larger components of the wave pattern resistance from the mother ship sectional area curve. The method is applied to a middle speed ship at the designed Froude number 0.375 and two new ship forms are designed and tested. The noticeable results are not obtained probably due to the condition that the bow bulb closely beneath the water surface causes the strong nonlinear waves. Nevertheless the present method is concluded to have a possibily of a good method of ship hull from improvement at Frounde number 0.24 to 0.35 because of the fact that the difference of amplitude functions between two defferent ships corresponds well to the difference of the sectional area curves.
