# A-weighted sound power level (SWL) at variable speed (plot_VS_ASWL_overall)

Post-processing documentation
Matlab commandplot_VS_ASWL_overall
Module VS.pp
Description PLOT_VS_ASWL_OVERALL plots the overall A-weighted sound power level (SWL) at variable speed
Parameters
Restrictions

### Result

The graph shows the overall sound power level of the machine as a function of speed or time.

The red line indicates the speed above which the maximum spectrum frequency is above the frequency of study specified by the user with Input.Simu.freq_spec_max. The green line indicates the speed above which field weakening is applied if relevant.

A-weighted variable speed sound power level spectrum
plot_VS_ASWL_overall

For further plot options (e.g. change axis) see How to change plot options.

This graph allows to identify if any acoustic resonance occurs during the run-up of the electrical machine.