Electromagnetically-excited noise and vibrations in railway applications

Railway noise can involve electromagnetically-excited acoustic noise and vibrations, in particular noise and vibrations of electrical machines.

The electrical traction chain of rolling stocks include both active and passive systems which can potentially vibrate and create acoustic noise due to electromagnetic forces. The acoustic noise level of railway transports is strictly regulated at several levels (TSI, IEC), and these standards include some penalies for the tonal character of these acoustic annoyances. The acoustic noise due to electromagnetic forces is characterized by strong tonalities: the understanding of their root cause is therefore essential to reduce them at source and meet standard requirements with minimal cost.

These railway components are more especially:
- electrical traction motors (synchronous, induction motors)
- capacitors, inductors (chokes) used in filters
- transformers
- converters (e.g. inverters and rectifiers)
- braking resistors
- electrodynamic brakes

EOMYS characterizes these annoyances with specialized electrical, vibratory and acoustic measurements, proposing both electrotechnical and vibro-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 electromagnetically-excited noise and vibration.

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