Characterization of the acoustic performance and dynamic behavior of an E-powertrain

Context & Issue

To characterize the acoustic performance of the E-powertrain, noise measurements and analyses were carried out. Noise measurements are carried out over a specific frequency range to determine the noise level at different frequencies.

To understand the  E-powertrain’s dynamic behavior, it was important to measure the vibrations that occur during operation. Vibration measurements are carried out using accelerometers placed on different parts of the system.




Control vehicle comfort


Define supplier specifications


Benchmark vehicle

Key Development Points

Modal analysis of the complete powertrain

Modal analysis is a method used to study the vibration modes of a given mechanical system. In the case of a complete powertrain, this involves analyzing the vibration modes of powertrain components such as the engine, transmission and driveshafts.

Measurement of vibration levels and operating deformations

Vibration data is usually collected in real time using a data acquisition system which can record vibration signals in the form of frequency spectra.

Strain data can then be analyzed to identify excessive strains, torsional vibrations and changes in strains over time.

Powertrain sound power measurements

Whatever method is used, it is important to ensure that measurements are carried out under reproducible conditions and in compliance with automotive industry standards. The results of sound power measurements can be used to optimize engine and exhaust design, as well as to assess compliance with vehicle noise and sound quality standards.

Results & Benefits

  • Deciphering the E-Powertrain’s dynamic behavior

In terms of performance, the E-Powertrain can deliver rapid acceleration and instant response to the driver’s demand for power. The high torque available from start-up, combined with precise regulation of the electric motor, enables rapid acceleration and smooth driving.

  • Identifying the E-Powertrain’s radiating elements

Radiant elements in this context often refer to the system components that generate, transmit or control the electrical energy used to power the electric motor.

  • Recording experimental results to recalibrate numerical machine models

In general, any experimental result that allows model predictions to be compared with real measurements can be used to update the numerical model. It is important to use as many experimental results as possible to validate and improve model accuracy.