Numéro : 2462 - Year : 2005

Propeller large bandwidth excitations, consequences on the cruise ship comfort

Annik BLANCHET, Chantiers de l’Atlantique – Saint Nazaire (France)
François BESNIER, Principia Marine – Nantes (France)
Ludovic JIAN, Principia Marine – Nantes (France)

The low vibration level needed to fulfil comfort class required by ship-owners, especially in the aft part of passenger ships, where most of the public area are located, can only be achieved by optimal propeller design. Pressure fluctuations associated to the first two harmonics of blade passing frequency, without cavitation, are well controlled. But cavitating vortices generate a continuous pressure spectrum (broad band) responsible for noise and vibration problems. Ship owners are demanding now, besides usual narrow band (peak) criteria, broad-band citeria, according to the new ISO 6954 2000. Chantiers de l’Atlantique, in collaboration with Principia, has developed a new methodology, allowing taking into account broad band criteria in the design phase. This methodology, applied to a cruse ship recently delivered by Chantiers de l’Atlantique is presented with comparison to measurements at sea and in modal basin.

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