Modal analysis

Modal analysis allows determination of dynamic parameters of mechanical systems, such as:
 
  • natural frequency (possibility of determination using experimental or analytical methods)
  • natural vibration character,
  • damping.
Modal analysis is not only a good tool for solving problems connected to resonance, but also it plays a great role in product quality control:
 
  • quality of casts for brake discs and drums,
  • compatibility of vibration dampers with requirements (frequency and damping),
  • an object’s modal characteristics with reference to a mathematical model.
A system can be stimulated using different types of excitation:
  • impulsive (modal hammer),
  • sine wave, random (vibration system).
Modal analysis of the car body part
Brake disc modal analysis test bench

Operating deflection shapes (ODS) 

Visualisation of modes helps in the understanding dynamic properties of a mechanical system. It is a helpful tool in solving problems connected with both noise and durability of machinery design, for example avoiding premature cracks.

Norms

  • FIAT 7. H 4030 *
  • FIAT 7.R0052 *
*the customer provides norms for testing

Equipment

  • OR38Measuring system – 32 channels (OROS),
  • OROS Modal 2 software (ODS),
  • PCB and ENDEVCO 1- and 3-axis sensors,
  • Brüel&Kjaer modal hammer,
  • vibration systems: (Bruel&Kjaer, Data Physics, Unholtz-Dickie, Dongling).

We perform, among others:

  • modal analysis in tests of brake discs and drums
  • modal analysis in tests of vehicle body elements
  • modal analysis – checking tooling in terms of natural vibrations

 See more: 

Document No. Title/Description
FIAT 7.R0052 FIAT 7.R0052
FIAT 7. H 4030 FIAT 7. H 4030