Underwater radiated noise of a double ended ferry with SRE thrusters

Regulations regarding underwater radiated noise of marine vessels are expected to become more strict in the near future as a result of updated international guidelines. For a ferry with a Schottel EcoPeller (SRE) type thruster unit, an investigation campaign consisting of a underwater noise measurement and several simulation types is conducted. The hydrodynamic flow is investigated with several simulation approaches under consideration of cavitation effects and the interaction between the vessel and the propulsion unit. A unidirectional coupling between the hydrodynamic loads and the thruster structure is established to evaluate the complete acoustic emissions of the propulsor considering structural contributions and is compared on a spherical control surface around the unit. For the far-field, single noise observers are evaluated by applying an acoustic analogy. From the investigation results, the contributions of the propeller hydrodynamic, propulsion unit mechanical and vessel machinery noise are identified. Moderate agreement of the sound pressure level between measurement and simulations is achieved depending on frequency, with the largest unconsidered contribution originating from vessel machinery. In conclusion, the complete acoustic signature of the vessel and propulsion unit for the investigated operation point complies with classification societies limits in both measurement and simulations.

Subjects

Azimuthing Thruster

CFD

Full-scale Measurement

URN

DDC Class

620: Engineering

Publication version

publishedVersion

Lizenz

http://rightsstatements.org/vocab/InC/1.0/

Name

Kimmerl-UnderwaterRadiatedNoiseOfADoubleEndedFerryWithSreThrusters-1140-1-final.pdf

Type

Main Article

Size

1.42 MB

Format

Adobe PDF

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Underwater radiated noise of a double ended ferry with SRE thrusters