Abstract
In order to investigate the limits of applicability of linear theory for predicting vessel motions in an irregular head sea, tests were carried out on a model of a high speed vessel in regular and irregular waves over a range of speeds. The results obtained in irregular waves were compared with those calculated using standard linear strip theory combined with linear superposition theory, and with those obtained from linear superposition theory combined with the experimental results in regular waves. This enabled the limits of both linear strip theory and linear superposition theory to be obtained. The results are given in terms of acceptable motion against significant wave height and speed for predictions based on linear strip theory and linear superposition theory, and for predictions based on linear superposition using the results from tests in regular waves.
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