A Validation of Stability Standard Applied to Hard-Chine Craft Using the Risk Analysis on Capsizing

Abstract

The Japanese Stability Standard and IMO A.562 which were originally established for large ships are occasionally applied to assess the stability quality of small ships. However the validity of the application has not been clarified yet. In the present paper, a method to validate the application of the present stability criteria to small craft on the basis of a risk analysis on capsizing is proposed. In order to compare the results by the present method with experimental results. experimental works on capsizing of a small hard-chine craft model in irregular waves are carried out. Since the comparison between the method and the experiments are in fairly good agreement, the present method is validated. The method is applied to calculate the probability of capsizing of seven kinds of small craft. The results demostrate that the present stability standard is much more severe for a small craft than for a large ship.