Technical Paper
Simulation and Validation of the Isolation-Effect of Acoustic Encapsulation Concepts Based on a Generic Electric Motor Housing
2023-06-12
2023-01-5034
Along with the increasing importance of battery electric vehicles for the automotive industry, new challenges have emerged in the development process of the acoustic behavior of the electric powertrain. One concern arises from the high-frequency whining noise, either caused by the electric field of the motor or by the gearbox. Noise is transmitted via two different paths, the structure-borne path and the airborne path. The focus here is on the latter one, which describes the radiated sound from the surface of the motor housing and the transmission through the car body to the driver’s ear. One possibility for reducing the effect of this acoustic radiation is the application of passive acoustic noise control treatments. This is typically done either by attaching secondary treatments on the vehicle-body side or by encapsulating the motor directly.