Experimental Evaluation of an Electric Powertrain for NVH
Typ
Examensarbete för masterexamen
Master's Thesis
Master's Thesis
Program
Applied mechanics (MPAME), MSc
Publicerad
2023
Författare
Sonnad, Praven
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
The conventional Internal Combustion (IC) powertrain is now being replaced by
alternative, low-emission options, such as the electric powertrain. As a result, the
tonal noise and vibration spectrum of the powertrain, previously masked by the
IC engine, have become more prominent in the electric powertrain, necessitating an
NVH (Noise, Vibration, and Harshness) analysis of the electric powertrain. Previous
studies by Vignesh [21] and Anujit [6] utilized a CAE (Computer-Aided Engineering)
model to examine the NVH behavior of the electric powertrain under various motor
and gearbox excitations, concluding that the highest contribution to the vibration
and noise response comes from the motor’s torque ripple and the transmission error
from the motor. The present study aims to experimentally analyze the NVH behavior
of the powertrain and assess the outcome of the earlier study.
The experimental evaluation is being carried out by measuring the vibration, noise,
and input shaft speed of the powertrain under different load conditions. The measurement
response is then analyzed using the order analysis using fixed sampling
method to obtain different acceleration and noise responses of the powertrain with
respect to various excitations and their associated orders. The response of the powertrain
is studied and compared with the CAE model’s behavior.
The comparison between the NVH response of the powertrain obtained from ROMAX
model and experimental data yield comparable results. The ROMAX model
demonstrated a good correlation with the experimental data for the gearbox excitations.
However, for the NVH response from torque ripple, the ROMAX model
tended to overestimate the response, even though the peaks in the response align
with those in the experimental data. Conversely, the NVH response from the motor’s
radial and tangential forces were underestimated in the ROMAX model. These observations
suggest that the ROMAX model of the powertrain provides a reasonable
approximation of NVH response, although fine-tuning the model to better represent
the experimental data would yield better results.
Beskrivning
Ämne/nyckelord
Electric powertrain , Noise, Vibration, and Harshness (NVH) , Order Analysis