Methodology for E-Drive NVH assessment demonstrated on an individual use case

With the trend towards electrification, as well as the reduced cycles of design, engineers are faced with many new challenges. Tonal noise such as motor whine and gear whine is more prominent for an electric drive (e-drive) powertrain in Hybrid Electric Vehicles (HEV) or Electric Vehicles (EV). This is because the ICE is not there anymore to mask this tonal noise. The source of the motor whine is the motor electromagnetic forces, whereas the gear whine originates mainly from the variation of stiffness during the meshing cycle, which is defined by the gear geometry and by the contact behaviour between gear teeth. Structural response of the powertrain to these excitations can result in excessive noise which can negatively affect customer satisfaction.