Assessment of extreme rolling of ships in random seas

Publikationstyp
Conference Paper
Date Issued
2014
Sprache
English
Author(s)
Dostal, Leo  
Kreuzer, Edwin  
Institut
Mechanik und Meerestechnik M-13  
TORE-URI
http://hdl.handle.net/11420/11041
Volume
7
Citation
International Conference on Offshore Mechanics and Arctic Engineering (OMAE 2014)
Contribution to Conference
ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2014  
Publisher DOI
10.1115/OMAE2014-23458
Scopus ID
2-s2.0-84911163821
The goal of our analysis is to improve intact stability criteria for ships. For this, we develop analytical formulas for mean first passage times of critical roll amplitudes of ships travelling in long crested random seas with an arbitrary wave encounter angle. Starting from a model for coupled heave-pitch-roll motion, we average the fast oscillatory dynamics of roll over the roll period, which yields equations for drift and diffusion of roll energy. The results are used to calculate the desired mean first passage times. Finally, we apply the proposed theory to a sample ship design.