Vibration analysis and NVH analysis

When products are put into operation, it is inevitable that vibrations will occur in their structure due to their specific product properties and external stimulation. This leads to a risk of fatigue, structural damage or failure, or simply excessive noise. TECOSIM specialists use comprehensive NVH analyses to identify and optimise dynamic structural properties.

Our engineers carry out damped and undamped vibration analysis on different vibration systems to determine dynamic structural properties. Dynamic behaviour can be analysed, predicted and improved based on natural frequencies and structural responses over a period of time and over a specific frequency range.

To perform a complete NVH - noise, vibration & harshness - analysis acoustic models are attached to the existing structure . Information about noise levels and noise emissions is obtained by transmitting sound from vibrating components to the surroundings, the process being represented in an acoustic model.

Vibration and NVH-Analysis for automobile industry

For the automobile industry TECOSIM has specialised on the following calculations in the field of dynamics:

Overall natural frequencies:

  • Torsion
  • Vertical bending
  • Lateral bending
  • Front end bending
  • Rear parallelogram
  • MAC factors


Modal analysis, local (examples):

  • Steering column
  • Replacement wheel recess
  • Doors, hatches, attached parts
  • Roof cross members
  • Module cross members

Frequency response analysis (examples):

  • Frequency responses to comfort points
  • Operational vibration modes
  • Modal participation factors (MPF)
  • Local dynamic stiffness (LDS)
  • Design of vibration absorbers
  • Mirror shake
  • Steering wheel shake
  • Gear shift vibrations


TECOSIM has also particularly specialised in NVH for automobile industry applications:

Acoustics (examples):

  • Sound propagation in passenger compartments
  • Droning in vehicle bodies
  • Low-frequency humming
  • Engine and powertrain noises
  • Study of impact from forces acting on engine mounts or subframe fastening points
  • Noises from tarmac and road surfaces