The Equivalent Radiated Power (ERP) is used to analyze the acoustic signature of the system. The ERP results estimate the radiated structure sound power from vibrating structural surface (it is only scoped to surfaces). The main workflow is based on ANSYS/Maxwell and Harmonic response. The waterfall diagram represents RPMs vs frequencies. RPMs are defined in ANSYS/Maxwell, while frequencies are the output of the harmonic response analysis. The ERP waterfall diagram can be saved as XML file to be used in ANSYS/Optis, where the sound of the ERP can be created.