Integrated approach to NVH analysis in electric vehicle drivetrains

Abstract

This paper presents an approach to noise, vibration and harshness (NVH) analysis suitable for electro-mechanical rotating systems, whereby both the electrical and mechanical sources of excitation are included and the response of the system is calculated. Focus is placed on modelling methods for the stator structure. The stator is considered to be a transversely isotropic structure and the effect that material properties can have on dynamic response is presented for a stator, both in isolation and in the full drivetrain model. NVH predictions are shown for a full drivetrain model of a prototype EV city car and compared to test data, demonstrating good correlation between test results and simulation with the described method.

Keywords

• electric vehicles
• vibrations
• stators
• automotive engineering
• structural acoustics
• power transmission (mechanical)
• electric vehicle drivetrains
• electro-mechanical rotating systems
• stator structure
• transversely isotropic structure
• material properties
• drivetrain model
• NVH predictions
• prototype EV city car
• NVH analysis
• noise vibration and harshness