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- Title
ON THE COMPARATIVE SEAKEEPING ANALYSIS IN IRREGULAR WAVES OF COMMERCIAL SHIPS HAVING THE SAME DISPLACEMENT, FOR NAVIGATION SAFETY ASSESSMENT.
- Authors
Gasparotti, Carmen; Rusu, Eugen; Domnisoru, Leonard
- Abstract
For the shipping companies one of the operational safety criteria of their fleet is based on irregular waves seakeeping assessment. This study is focused on the comparative seakeeping analysis of two container ships, having in common only the same displacement of 18000 t, with overall lengths of 139.96m and 149.50 m. The seakeeping analysis is based on the linear strip theory with frequency domain solution for the response transfer functions on coupled heave - pitch and uncoupled roll motions. There is considered a full ranges calculation 0-360 deg. heading angle and several ship speeds of 0-20 knots. The short term irregular waves seakeeping analyses are carried out for ITTC, ISSC, JONSWAP and Pierson-Moskowitz reference wave power density spectra. The numerical analyses are carried out with our own DYN_OSC program. The operational safety seakeeping criteria are expressed as limit RMS root mean square values for heave, pitch, roll motion and acceleration amplitudes, specific for commercial maritime ships. Based on the resulting statistical short term dynamic response polar diagrams, on each motion component and cumulatively, this study is pointing out the influence of ship dimensions, speed and heading angle on the navigation safety assessment.
- Subjects
SEAKEEPING; NAVAL architecture; SHIP hydrodynamics; CONTAINER ships; NUMERICAL analysis
- Publication
Annals of the University Dunarea de Jos of Galati: Fascicle II, Mathematics, Physics, Theoretical Mechanics, 2013, Vol 36, Issue 2, p372
- ISSN
2067-2071
- Publication type
Article