HV-Battery Impact on Car Body Acoustics and Damping Package Case Study of the Electric Vehicle

Damping treatments play a key role in the definition of efficient acoustic packages for passenger cars with all types of propulsion systems. Many damper configurations are similar for all vehicles including treatments of wheelhouses, spare wheel area, roof panels etc. However, there are some characteristics of car body acoustics in electric vehicles, which need to be considered in the definition of the efficient damping package. This paper investigates the impact of the high voltage (HV) battery on interior noise related characteristics of the car body using laser scanning vibrometry (LSV) and 3D sound intensity test methods. It is shown that both methods lead to similar conclusions in terms of proper distribution of damping material. Furthermore, findings are used in the damping package case study resulting in two additional proposals of the damping layout with different lightweight and acoustic requirements. Lab evaluation of the new damping package variants are conducted by laser vibrometry tests and the impact on interior noise is confirmed by road tests in the prototype vehicle.