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Application of 2nd generation stability code for 7600DWT bulk carrier with high value of GM, being in dead ship condition in irregular waves

Kacprzak Paweł

Zeszyty Naukowe Akademii Morskiej w Szczecinie

2023

nr 75 (147)

14--19

The main issue of this article is to apply and investigate the application of second stability criteria for bulk carriers in typical loading conditions sailing in irregular waves. The author, by the use of linear strip theory, calculates the significant amplitudes of the ship roll with respect to wave height, incident wave angles, and mean sea period. A basic stability analysis, in this case, could be insufficient when considering other related factors like cargo shift, taking up water on the weather deck, wind gusts, inaccuracy of transverse metacentric height, and the case of changing transverse metacentric height in long-crested waves. This article shows that, in some waving conditions, the weather criteria based on standard assumptions of the ISC 2008 may be insufficient. The application of the author’s method of safety margin may increase vessel safety in view of weather criteria.

Application of statistical methods and artificial neural networks for approximating ship's roll in beam waves

Cepowski T.

Polish Maritime Research

2005

nr 2

22-28

In the paper, were presented approximations of numerical calculations of ship's roll on the basis of main service parameters of the ship. This way were obtained several relationships which make it possible to approximate ship roll in regular and irregular waves by using the parameters available in the phase of voyage routing. The relationships were elaborated by means of artificial neural networks as well as linear and non-linear regression methods. A comparative analysis of the methods regarding approximation accuracy against standard data was also performed.