# A-weighted sound pressure level (SPL) at variable speed (plot_VS_ASPL_overall)

Post-processing documentation
Matlab commandplot_VS_ASPL_overall
Module VS.pp
Description PLOT_VS_ASPL_OVERALL plots the overall A-weighted sound pressure level (SPL) at 1m at variable speed REFERENCE script for overall plots
Parameters
Restrictions

### Result

The graph shows the overall sound pressure level calculated at specified distance from the machine as a function of speed or time. This allows to identify the resonance points of the machine.

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 pressure level spectrum
plot_VS_ASPL_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.