How to perform Electromagnetic Vibration Synthesis (EVS)?


This article shows how to use MANATEE electro-vibro-acoustic simulation software to quickly calculate electromagnetic vibrations using Electromagnetic Vibration Synthesis algorithm.


EVS uses structural model linearity to speed up calculations and give more physical insights as detailed in the article dedicated to EVS. EVS process separates calculation of operational magnetic loads (that can be evaluated using LIA or LEA techniques) and the structural characterization.

770. Rotating wave vibration synthesis
Rotating wave vibration synthesis
MANATEE EVS algorithm for fast EV HEV NVH calculation

MANATEE software v1.09 mechanical module can apply EVS algorithm to the following structural models:

  • MANATEE built-in semi-analytical vibroacoustic models (rotating wave only)
  • Altair Hypermesh/Optistruct structural FEA commercial software (tooth excitation or rotating wave)
  • Ansys Mechanical structural FEA commercial software (rotating wave only)
  • Nastran structural FEA commercial software (rotating wave only)

Coupling with other software such as Abaqus is under study.

GUI implementation


Scripting implementation

To perform EVS, a set of FRF must be first calculated, please refer to the following articles:

The EVS process based on wave FRF is activated with

type_mech_workflow = 4

The availability of a pre-calculated FRF is described with

Input.Simu.type_load_FRF = 2

Plot commands

The complete list of plot commands is available on MANATEE plot commands webpage. The following visualizations are more particularly related to this module:

  • order tracking analysis per load case
  • vibration or noise level of a specific harmonic for each load case

Validation cases


See also

  • Electromagnetic Noise Synthesis

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