A new approach to improving the accuracy of seakeeping predictions using strip theory for high-speed vessels

Abstract

Seakeeping is one of the most essential performances, so accurately predicting this performance during ship design is an important problem, but it is usually ignored due to its complex nature. In current methods, strip theory is often used to solve this problem due to its unique advantages of fast computation and ability to incorporate into the early stages of the ship design process. However, this method provides low accuracy for high-speed vessels due to the incompatibility of the motions of this type of vessel with the linear and small amplitude assumptions of strip theory. This paper presents an approach with algorithms and the frequency and time domain solution to improve the accuracy in the seakeeping prediction of high-speed vessels using strip theory. The results of applying this study to the Vietnamese displacement high-speed vessel named K88 showed that the deviations between theoretical computations and model test data were up 20 % with the classical strip theory by Salvesen et al., 1970), and were greatly reduced to within ±4.5 % in all computation cases after applying our proposed approach with a suitable correction factor.