Electromagnetically-excited noise and vibrations in naval applications

Ship noise can be dominated by electromagnetically-excited noise source, including noise and vibrations of electric motors.

The acoustic noise and vibrations of a vessel can be limited for on-board passenger comfort (e.g. cabin noise on cruise liners) or crew members health (e.g. noise in engine room), but it can be also a matter of discretion (e.g. for fishing and scientific research vessels) or security (e.g. submarines). The underwater noise of ships mainly come from the propulsion machinery, which is usually electrified using a diesel to electric generator in large ships. The noise and vibration levels are defined by some standards such as ICES 209 (SILENT classes) and DNV GL.

The electrical equipment that can be responsible for these noise and vibration annoyances include:

- propulsion motors
- bow and azimuth thruster motors, rim-driven thrusters
- pumps
- converters

EOMYS characterizes these vibroacoustic issues with specialized electrical, vibratory and acoustic measurements, proposing both electrotechnical, mechanical and acoustic solutions.

EOMYS also works at design stage helping the electrical engineers to assess the NVH performances of these components (for instance with MANATEE software), and realizing technical trainings on the control of magnetic noise and vibration.

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