CHARTS FOR ESTIMATING NONLINEAR HOGGING AND SAGGING BENDING MOMENTS

This paper presents charts for preliminary estimates of the nonlineari ties associated with wave bending moments acting on a ship moving in a stationary sea. Deviation of the actual hull shape above the waterlin e from ''vertical wall'' is characterized by a flare coefficient. The charts show the influence of the flare coefficient, among other parame ters, on a nonlinearity parameter which may be used to estimate the di fference between wave hogging and sagging moments. Three application e xamples are given at the end of the paper to illustrate how the charts can be used in conjunction with linear strip theory results in order to estimate slightly nonlinear hogging and sagging moments.