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).

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 also: 

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