Acoustic modules (AC)

Description

The acoustic module AC of MANATEE software calculates the acoustic noise (sound pressure level and sound power level as a fine band spectrum or third octave analysis) radiated by the electrical machine due to a given vibration velocity field.

AC.ANL calculates the radiation efficiency of the external structure (rotor or stator) is based on a semi-analytical model of an equivalent finite length cylinder. Other semi-analytical models include the radiation efficiency of a pulsating sphere or infinite length cylinder. Depending on the machine dimensions the best model can be automatically chosen.

AC.NUM calculates the sound pressure field using numerical techniques.

Validations

Contrary to numerical methods like Boundary Element Methods or Finite Element Methods the semi-analytical acoustic model AC.ANL can calculate acoustic noise up to 20 kHz in a fraction of second with good accuracy (see the validation cases of MANATEE, in particular AC_IPMSM_001).

Post processings

The following post processing are available after acoustic calculations:

The spectrograms, order tracking etc are part of the e-NVH Laboratory post processings.