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ROTEC · Measurement applications
E-axle vibration and NVH analysis
Analyse torsional vibration, transmission error and acoustic signals together in a compact electric drive.
Measurement task and objective
Investigate audible and perceptible vibration in electric axle drives and its influence on NVH and driving comfort.
Time-domain analysis
- Dynamic angles of twist in gearbox components.
- Shaft torsion.
- Shock loads during load changes.
- Drive stiffness.
Acoustic analysis
- Identify noise sources.
- Detect component resonances.
- Use specialised software functions for gearbox testing.
Speed and transmission error analysis
The source measurement arrangement records speeds at the electric motor, gearbox output and intermediate shafts. These signals support evaluation of shaft torsional vibration, relative angle of twist and gear transmission error.
Transmission error is relevant to the investigation of gearbox whine and NVH behaviour. Achievable resolution and measurement uncertainty depend on the configuration and installation.
Accelerometers record structure-borne sound and microphones record airborne sound. The signals are analysed together in the order and frequency domains. The source also describes using HV measurement probes from partner KLARIC to measure current and voltage.
The compact e-axle as a complete system
An electric axle drive combines the electric motor, gearbox and power electronics in a compact unit. The components must be considered together in terms of strength, weight, installation space and sound transmission.
Vibration can affect perceived driving comfort. Torsional vibration analysis helps investigate excitation mechanisms and the overall NVH behaviour of the electric drive.
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Engineering support and evaluation
ROTEC ENGINEERING supports vibration analysis of engines, transmissions and drivetrains. The source includes timing-drive validation, valve train optimisation, clutch assessment, transmission error, gearbox and oil-system investigations, drivetrain measurements, current and voltage analysis and measurement installation.
Time-domain evaluation can be combined with acoustic analysis to address the specific development question.
Questions and answers
Why evaluate transmission error and NVH together?
Transmission error describes an important source of gearbox excitation. Comparing it with speed, structure-borne sound and airborne sound supports investigation of gearbox whine and other noise components.
Discuss your measurement task with ROTEC
ROTEC ENGINEERING supports measurement-system selection, installation, testing and evaluation to suit your application.
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