Praveen Sonnad presents his master’s thesis

Student: Praveen Sonnad
Main Supervisor: Ramkumar Kandasamy, Volvo CAE
Examiner: Håkan Johansson
Opponent: Ponkumar Santhosh Elango and Ram Jayanath Ainikkattil

Abstract of thesis

The conventional Internal Combustion (IC) powertrain is now being replaced by alternative, environmentally friendly 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 tracking 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.