NVH assessment and optimization for EVs and HEVs

Electrical and hybrid vehicles development open a new field of noise and vibration challenges. First, a quieter cabin environment, relieved from the ICE noise, let new sources emerge. Those sources often generate low sound levels but with unworked sound design, providing consequently a poor sound experience for the passenger. On its side, the main propulsion motor plays a major role in the overall sound: its vibroacoustic behavior can be assessed and improved using the appropriate technology. Globally, E-NVH requires a wide scope of dedicated skills and high-end tools.


Acoustic holography on mirrors

Transfer path analysis

Panel contributions at target

Sources ranking

Electric motor noise

Electric motor design

Electric markers


Sound design of e-motors

Components sound power

Sound pressure based

ISO 374x

Components sound quality

Emerging sources sound design

Filtered playback

Pyschoacoutics evaluation

Battery charging noise

Chassis modal analysis

Light structure modal analysis

OROS recommended solutions package

Electric Vehicle / Hybrid Vehicle

  • Motor geometry
  • E-markers and spatiogram
  • OR35-10 : 10 channels
  • Microphones and accelerometers

Transfer Path Analysis

Sound Quality

OROS advantages

Easy to use

  • Dedicated interface
  • Guided testing operation
  • Rugged for the field
  • Portable or large channel count

Powerful algorithms

  • Noise characterization based on spatiograms
  • e-frequencies calculation

High end metrology

  • 24 bits, low noise, large dynamic
  • 40 kHz
  • Real time acquisition