Authors: R.V. Borisov, M.A. Kuteynikov, A.A. Luzyanin, V.R. Samoylov
Abstract
Modern weather criterion (2008 IS Code) is calculated to prevent a ship's heeling due to combined action of wind and waves. Although the idea behind it can be physically justified, many of the assumptions, on which the criteria are based, are currently at a discussion stage at IMO in scope of the review of 2008 IS Code. In the presently used criterion the character of roll and wind is mostly deterministic. The criterion is either fulfilled or not and does not take into account possible differences in ship designs and specific navigation areas characteristics with their specific wind and waves conditions. The criterion is very difficult to correct within certain limits even using the experimental results: it is basically a "black box" without the possibility to take into account the important characteristics of the ship in accordance with the analysis. The determination of safety level using the criterion also proves difficult. The methodologies that take into account the combined effect of wind and waves and their irregular character (stochastic approach) are currently being developed in order to overcome these problems, wherein the spectra of actual wind and waves are used, the mean wind speed being the connecting link. The proposed stochastic approach allows in principle to assess the safety of a specific ship in the specific real operational conditions.
Keywords: stability, seaworthiness, weather criterion, roll, wind and waves action.
References
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About authors
Borisov Rudolf - DSc, professor, FSEI St. Petersburg State Marine Technical University, 3, Lotsmanskaya str., 190121, St. Petersburg, Russia, e-mail: rvborisov@mail.ru
Kuteynikov Mikhail, DSc, FAI “Russian Maritime Register of Shipping”, 8, Dvortsovaya Naberezhnaya, 191186, St. Petersburg, Russia, e-mail: kuteynikov.ma@rs-class.org
Luzyanin Aleksander - PhD, FSEI St. Petersburg State Marine Technical University, 3, Lotsmanskaya str., 190121, St. Petersburg, Russia, e-mail: aaluzyanin@rambler.ru
Samoylov Vladimir - FAI “Russian Maritime Register of Shipping”, 8, Dvortsovaya Naberezhnaya, 191186, St. Petersburg, Russia, e-mail: samoylov.vr@rs-class.org
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