Association Technique Maritime et Aéronautique

Numéro : 2587 - Year : 2010

Some aspects of the hydro-elastic ship response

Quentin DERBANNE, BUREAU VERITAS – Division Marine
Fabien BIGOT, BUREAU VERITAS – Division Marine
Michel HUTHER, BUREAU VERITAS – Division Marine
Johan TUITMAN, TNO – Delft


The hydro elastic response can be an important part of the total structural response of the ships. Usually two hydro elastic effects are defined. Springing is the global hydro elastic response of the hull girder to linear or non linear non impulsive excitations. It is a resonant phenomenon that appears in relatively small sea states with large ships at high speed, having relatively low natural frequencies for their elastic modes. From that point of view springing is important for fatigue damage of structural details. On the opposite, whipping is defined as the transitory hydro elastic response to an impulsive loading such as slamming. Whipping usually appears in rather high sea states where slamming is important. Whipping may be important for fatigue damage and for extreme responses, and it can affect any type of ship, depending on the slamming intensity. During the last years an important effort has been done in cooperation between Bureau Veritas and TNO to build a model that can compute these responses. An efficient coupling between the Hydrostar hydrodynamic model and the structural models (non uniform beam or 3D Finite Elements Model) has been developed and is currently under validation. This report shows some validation results with model scale tests.

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