Browse Publications Technical Papers 2018-01-1499

Integrated approach to electro-mechanical system NVH analysis 2018-01-1499

The paper will present an integrated approach to system NVH analysis, which gives an insight into the system response in an EV driveline due to electrical and mechanical excitations; namely gear transmission error, rotor mechanical imbalance, electrical machine torque ripple, and stator radial force shapes. The paper will present a simulation of a ‘representative’ drivetrain consisting of interior permanent-magnet electrical machine, two-stage parallel gearbox, bearings and housing; where the housing and stator geometry is represented as a finite element representation, and where non-linear mechanical parts such as gears and bearings are represented with analytical and empirical models. The paper will demonstrate through simulation the importance of considering the complete system when evaluating NVH performance. This will be demonstrated by examining how the response of the drivetrain is affected by electro-mechanical interactions. The simulation will demonstrate the importance of considering influences such as system boundary conditions, the representation of bolted connections, and manufacturing tolerances, and will also demonstrate how bearing selection and preload can affect the system response to both gear and electric machine excitations. Furthermore, the paper will present validation results of NVH testing performed on a prototype drivetrain, developed to meet the system requirements of a battery EV city car as part of an EU funded project. Good agreement will be shown between measured and predicted response due to both gear and electrical machine excitations. The sensitivity of the predicted response to material properties and Rayleigh damping coefficients will also be discussed.


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