Abstract
The prevention of excessive roll acceleration is one of the fundamental requirements of an oceangoing vessel at sea. In this paper, aiming at this requirement, we propose a new theoretical method for calculating roll angular acceleration, called “PDF line integral method.”. This paper presents the derivation of this method and a numerical comparison with Monte Carlo simulation (MCS) results; also, its validity is shown. Although the utilized GZ curve (restoring curve) exhibits strong asymmetricity, the proposed method can provide for such a condition. With only the information of roll and roll rate joint probability density function (PDF), this method can approximately calculate the roll angular acceleration, which is a high-order differential property. In addition, a relatively good agreement is achieved between the theory and MCS results.
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Acknowledgements
We are grateful to Dr. Munehiko Minoura of Osaka University and Prof. Toru Katayama of Osaka Prefecture University for their technical advices and discussions. This work was supported by a Grant-in-Aid for Scientific Research from the Japan Society for Promotion of Science (JSPS KAKENHI Grant Number 19H02360) as well as the collaborative research program / financial support from the Japan Society of Naval Architects and Ocean Engineers. Further, part of the research was conducted as a collaborative research with ClassNK. We would also like to thank Enago (www.enago.jp) for the English language review.
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Maki, A., Dostal, L., Maruyama, Y. et al. Theoretical estimation of roll acceleration in beam seas using PDF line integral method. J Mar Sci Technol 26, 828–834 (2021). https://doi.org/10.1007/s00773-020-00770-1
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DOI: https://doi.org/10.1007/s00773-020-00770-1