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Almost Sure Stability Analysis of Parametric Roll in Random Seas Based on Top Lyapunov Exponent
Author(s) -
Dostal Leo,
Kreuzer Edwin,
Sri Namachchivaya Navaratnam
Publication year - 2012
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201210292
Subject(s) - lyapunov exponent , parametric statistics , position (finance) , exponent , stability (learning theory) , mathematics , control theory (sociology) , motion (physics) , mathematical analysis , statistical physics , physics , classical mechanics , statistics , computer science , nonlinear system , economics , quantum mechanics , linguistics , philosophy , control (management) , finance , machine learning , artificial intelligence
Stability analysis of the upright position of a ship in random head or following seas is presented. Such seas lead to parametric excitation of roll motion due to periodic variations of the righting lever. The development of simple criteria for the occurrence of parametric induced roll motion in random seas is of major interest for improvement of the international code on intact stability provided by the International Maritime Organization. The stability analysis in random seas is based on the calculation of the top Lyapunov exponent using the fact, that a negative top Lyapunov exponent yields no roll motion. With this findings, roll motion can be excluded for specific sea states. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)