On 3D-FEM analysis of a 9000 tdw tanker global eigen vibration modes

Identifying a vessel global eigen vibration modes during early stages of the design process is necessary, as it allows the prediction of special phenomena such as springing, whipping or other different resonance conditions, that can lead to an uncomfortable working environment or in extreme cases even damage of the structure or equipment’s. An advance approach for assessing the ships’ eigen vibration characteristics is based on the 3D-FEM method. This research is focused to analyse the eigen global vibration frequencies, for vertical, horizontal, and torsion modes, of a 9000 tdw tanker, pointing out the influence of the surrounding water by hydrodynamic added masses formulation.