Internal Combustion, Electrification and the future of Automotive NVH FOCUS: NVH In this test an electric powertrain is instrumented with accelerometers to deduce the powertrain contribution to electric vehicle pass-by noise. Minimum noise requirements have been placed on electric vehicles to enhance their aural detectability from the standpoint of blind and low vision pedestrians, especially at low vehicle speeds. Monitoring of this audibility concern by the National Highway Traffic Safety Administration (NHTSA) resulted in the creation of Federal Motor Vehicle Safety Standard (FMVSS) No. 141, " Minimum Sound Requirements for Hybrid and Electric Vehicles " , which requires pedestrian alert sounds to be added to electric vehicles. A system designed to add such pedestrian alert sounds is known as an Acoustic Vehicle Alerting System (AVAS). FMVSS No. 141 applies to fully electric vehicles, as well as to hybrid electric vehicles that can be operated in a purely electric mode. The standard mandates pass-by noise testing of electric vehicles at three constant speeds of UPDATE 10, 20, and 30 KPH, for the purpose of validating the aural detectability of the vehicle and its acoustic alerting system. Meeting with the FMVSS No. 141 regulatory standard is a fascinating NVH problem, as it is easy to imagine how an electric vehicle might meet the legal requirement and simultaneously annoy the occupants of the vehicle and / or the people outside of the vehicle. Picture an ice cream truck driving through your neighborhood while playing a shopworn melody to attract young customers. This aural December 2021 9 Jennifer Bastiaan / Kettering University