NVH Analysis of a 200 kW Drive for a Double-Decker High-Speed Train in Lightweight Construction Using a 3D Scanning Laser Doppler Vibrometer

Abstract

This paper deals with the NVH (Noise, Vibration, Harshness) simulation and measurement for a 200 kW direct drive in lightweight construction. In a previous paper, the designed electrical machine and the possibilities of NVH measurement were presented. First, the calculation of the electromagnetic forces of the electric machine using finite element method (FEM) software is described, as well as the simulative determination of the vibration modes of the mechanical structure. This is followed by a description of the measurements using a 3D scanning laser Doppler vibrometer. The focus of the measurements is initially placed on the modal analysis of the mechanical structure. Following on from the measurements on the test rig, the measurement data obtained is compared with the simulation. In order to compare the electromagnetic simulation with the measurement results, vibration measurements of the externally driven machine are then carried out. Different speeds are used to investigate the influence of the speed on the overall vibrations of the electric machine.