engleski

UNCERTAINTY IN HULL GIRDER FATIGUE ASSESSMENT OF CONTAINERSHIP

The aim of the paper is to investigate differences in fatigue assessment of 9200 TEU containership caused by uncertainties in prediction of global wave loads. For that purpose, long-term predictions of linear vertical wave bending moment is calculated using different seakeeping tools and assuming different shipping routes. Thus, hydrodynamic analysis is performed using seakeeping software WAVESHIP implementing strip theory and 3D panel code HYDROSTAR. Long-term prediction is performed for 2 different wave environments: shipping route in North Atlantic (without forward speed) and World Wide trading route (forward speed 60 % of nominal speed). The fatigue life of ship hull girder is assessed according to Common Structural Rules for Oil Tankers. Resulting fatigue lives obtained by different seakeeping tools and for different wave environments are compared. Finally, influence of wave-induced ship vibration on fatigue life is assessed.

containership; wave loads; fatigue

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