determination of Vehicle Interior Noise Due to Electro Motor 2019-01-1457
Automotive industry is facing new NVH challenges due to the emergence of hybrid and electric vehicles. In these vehicles, because of the absence of the dominant noise source from internal combustion engine many other sources become unmasked. In addition, new noise sources are generated by the electric powertrain system. One of the important noise sources is the electric motor of the electric powertrain system. The present work is directed towards the application of numerical simulation methods for the evaluation of automotive interior noise due to an electric motor. Specifically, the interior noise of a typical automotive cabin is evaluated numerically. In the first phase, electromagnetic simulation is performed to evaluate the transient (Maxwell) forces on the teeth of the stator of the motor. Subsequently, the forces are transformed to frequency domain and applied to calculate the motor vibration using structural dynamic analysis. These vibrations are mapped to the surface of the motor housing and the radiated noise is computed using acoustic boundary element analysis. In the final phase, the sound power radiated by the electric motor is used as an input to calculate the interior noise of a typical automobile using statistical energy analysis. Additionally, preliminary optimization studies for noise reduction are also performed.
John G. Cherng
Univ. of Michigan-Dearborn
Noise and Vibration Conference & Exhibition