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- Title
NUMERICAL ANALYSIS OF SHIP SPEED LOSS IN IRREGULAR WAVES INFLUENCE ON LONG TERM FATIGUE STRENGTH PREDICTION, FOR A 1100 TEU CONTAINER SHIP.
- Authors
Rubanenco, Ionica; Domnisoru, Leonard
- Abstract
Standard fatigue analyses for ship structures are usually carried out in the hypothesis of constant ship speed and low frequency oscillation wave induced loads. This paper is focused on the study of the influence of ship speed changes on the long term fatigue strength assessment. The ship speed loss in irregular waves is significant for container ships class, so that in extreme sea conditions it can be larger than 50%. In order to obtain a more realistic ship - wave model, in this study the ship structure short term irregular wave loads are based on a hydroelastic analysis, taking into account the low and high frequencies, oscillation and vibration dynamic responses. As case study is considered a weight optimized structure of an 1100 TEU container ship, with two main loading cases: full cargo and intermediate cargo, without containers on deck. The fatigue analysis is based on cumulative damage factor method, using 3D/1D-FEM short term significant stresses and long term World Wide Trade wave significant height histogram. It is considered the American Bureau of Shipping scenario for container ship speed loss in irregular waves. The numerical results are pointing out the sensitivity of the fatigue analysis in terms of ship speed changes and hydroelastic loads.
- Subjects
NUMERICAL analysis; CONTAINER ship design &; construction; MATERIAL fatigue; HYDROELASTICITY; MECHANICAL loads
- Publication
Annals of the University Dunarea de Jos of Galati: Fascicle II, Mathematics, Physics, Theoretical Mechanics, 2013, Vol 36, Issue 2, p137
- ISSN
2067-2071
- Publication type
Article