In recent years, due to the sadly well-known environmental problems concerning air pollution, the automotive field is moving towards greener solutions: the electrification of vehicles is becoming more and more important, even exceeding most forecasts. The electrification of vehicles is spreading worldwide only recently, and the NVH (Noise, Vibration, Harshness) problem should be completely reconsidered, since the main noise and vibrations sources are changed with respect to conventional ICE (Internal Combustion Engine) vehicles. Furthermore, many noises that were totally inaudible in ICE vehicles, moving to electric vehicles can become really annoying since the masking effect of the engine is missing. Therefore, the aim of this thesis is to propose a method to investigate in depth all the aspects concerning the NVH of electric powertrains, by exploiting the features of a commercial specialized software, Romax.