engleski

Some aspects of hydroelastic issues in the design of ultra large container ships

Recent trends in increasing the size of container vessels, raise the new hydro-structural issues in ship design both from extreme loading point of view and fatigue point of view. Indeed, due to their extreme size (almost 400m in length) these ships become much "softer" which means that their hull natural frequencies will be significantly reduced. At the same time ship speed remains relatively high (around 25 knots) so that risk of hydroelasticity resonance between the waves and the structure (springing) is present. In addition, due to the very large bow flare of these ships, the importance of slamming induced vibrations (whipping) is also increased. Finally, local hydroelastic interactions of the bow structure with extreme slamming pressures, also become an important issue. When we know that even rigid body seakeeping analysis of the ship sailing in waves is still a challenge from modeling point of view, we can easily imagine the complexity of the numerical models which need to be put in practice in order to properly evaluate these hydroelastic effects. The present paper assumes that the seakeeping part is known and concentrates in hydroelastic aspects of ship-wave interactions only. It is a continuation of the paper presented at the last Workshop.

hydroelasticity; ultra large container ships

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