An accurate assessment of the vibro-acoustic behaviour of variable speed applications requires to run calculations over a high number of operating speeds to correctly catch structural resonances and maximum levels. This usually represents a high computational load, as multiphysic e-NVH calculations must be carried at each speed.
Manatee software Electromagnetic Vibration Synthesis (EVS) algorithm provides a significant acceleration of computing time of electromagnetic vibrations at variable speed or during optimization loops. This is done by splitting the characterization of the structural response from the calculation of operational magnetic loads assuming that linear structural dynamics. More than a significant acceleration of the computation time, EVS gives more physical insights on load cases which are radiating the most noise (e.g. radial pulsating force applied to stator teeth).