Figure: E-powertrain measurements and analysis

Torsional vibration measurements and analysis on e-powertrain

Investigations on electric powertrains present engineers with new challenges as torsional vibrations from electric motor and gearbox result in noise problems and might lead to mechanical failures. Combining the dynamic measurement of torsional vibration, analog sensor values, CAN / OBD data as well as current and voltage probes enables an overall analysis of the electric powertrain.

In order to identify and localize the dynamic torsional vibration excitations and the noise sources of an electric powertrain, it is equipped with ROTEC high-resolution speed sensors and high-frequency speed measurement boards with a 12.3 GHz clock. Typical measurement points are e-motor, transmission input and output shafts. The high clock frequency allows to detect the dynamic angular displacement between two shafts in µrad range and, for example, to analyze the noise-inducing transmission error between two gears. In addition, microphones and accelerometers are placed in the engine compartment and driver’s cab. For NVH investigations ROTEC offers high-resolution analog measurement boards with IEPE channels and special NVH features in the analysis software. Current and voltage measurement probes from KLARIC are applied to the battery, DC charging, on board charger, HV PTC and HV ECC. CAN signals are recorded at the CAN / OBDII interface, e.g. throttle and brake position. The recorded measured values are evaluated in the time and spectral domain.

ROTEC ENGINEERING supports you with expert engineering knowledge in problems related to vibration analyses on engines, transmissions and powertrains. With our know-how, we make a valuable contribution to your product in the areas of control drive validation, valve train optimization, clutch design,  transmission error (TE), transmission optimization, oil supply optimization, powertrain measurement and optimization, measurement technology application.

Analyses in time and spectral domain

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  • Combination of mechanical and electrical quantities (current and voltage) in the drive train
  • Rotational irregularities in the drive train
  • Transmission error (TE)
  • Torque and forces
  • Analysis of speeds and acoustic behavior
  • Efficiency of powertrain
  • Efficiency of consumers and complete vehicle
  • Control behavior e.g. of inverter, ABS, ESP
  • Correlation between acoustics, rotational irregularities as well as troque and forces
  • Identification of noise sources
  • Detection of component resonances

Case study & video

Causes of noise behaviour and impacts of torsional vibrations on e-powertrain

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Associated ROTEC products