3. Prediction of audible magnetic noise

Using expressions for magnetic line frequencies, simple graphical tools can be used to predict the appearance of resonances in the variable regime. If you want to obtain an estimate of the noise level, numerical simulation is essential. In both cases, it is necessary to calculate the main natural frequencies of the machine, which can be done using finite element software or analytically. As stated in the introduction, analytical methods are favored here for their computational speed, which enables noise to be simulated in variable regime and the model to be coupled with optimization tools.