MANATEE software | e-NVH algorithms |
---|---|

Sub-module |
ALG.ENS |

Function |
Electromagnetic Noise Synthesis |

Validation |
TBC |

See also |
ALG.EVS Electromagnetic Vibration Synthesis ALG.LIA Load Interpolation Algorithm ALG.LEA Load Extrapolation Algorithm |

### Objectives

The accurate calculation of noise and vibrations of electric powertrains requires to evaluate their **NVH behaviour at variable speed, taking a high number of speed steps** to correctly catch structural resonances. This usually represents a high computational load, as dynamic vibroacoustic calculations must be carried at each speed.

MANATEE Electromagnetic Noise Synthesis (ENS) algorithm aims at **speeding up computation** of acoustic noise at variable speed or during optimization loops in detailed design phase of e-motors (based on a 3D FEA structural and acoustic model).

### Description

This module is the equivalent of ALG.EVS for acoustic noise. It **speeds up magnetic noise calculations** while giving more physical insights by applying **elementary electromagnetic loads** in radial & tangential directions on the vibroacoustic model, calculating the acoustic **Frequency Response Functions** and synthesizing the overall acoustic response under operational loads. The vibroacoustic FEA model must exist under Actran. ENS is particularly useful when a high number of operational loads have to be calculated, for instance in variable speed calculations (e.g. NVH maps on torque speed plane) or in optimization mode (e.g. pole shaping).

### Technical details

For further technical details, please see our dedicated article on Electromagnetic Noise Synthesis.

### Graphical post-processing

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