The driving comfort, especially for urban use-cases, is a factor of growing importance for buying decisions. Since the masking of an internal combustion engine (ICE) is no longer pre-, sent, especially for battery electric vehicles (BEV) the acoustic quality will as well be an elementary distinguishing feature. Opposing the importance of the acoustic quality is the lack of knowledge of how to measure and interpret the high frequency noise generated by an electric powertrain, with respect to the NVH behavior influencing the passengers. In this contribution, a method for measuring and interpreting the transfer path of acoustic phenomena for an electric powertrain with a permanent magnet synchronous machine (PMSM) and a two stage transmission is presented. Thereby, the torsional excitation of the gearbox by the PMSM is focused. The torsional vibrations are measured with a rotational vibrometer in a special setup using a prepared gearbox with accessible shafts. The measurements are performed by using the IPEK-X-in-the-Loop Framework (XiL) to consider the measuring results in the context driver and environment. Thus, measurements on an anechoic powertrain test bench are performed. These measurements will be extended and validated using the same setup in a vehicle on the IPEK acoustic roller test bench.
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