Experimental Modal Analysis (EMA) is an effective instrument for describing, understanding and modelling the dynamic behaviour of a structure.
It can be carried out both to determine the natural frequencies and mode shapes of a structure and to verify accuracy and calibrate a finite element model (FE). Also, the EMA can be used in order to make a troubleshooting vibration problems.

Thanks to the best specialized softwares, SINT can carry out the PRE-TEST analysis (in order to chose the best set-up measurement) and the CORRELATION analysis (for the comparison of the Finite element model with the experimental model).

SINT Technology can determine the main modal parameters:

 

  • Natural frequencies
  • Mode shapes
  • Damping

 

The validation of the modes is done using the following:

  • Modal Assurance Criterion (MAC)
  • Complexity tools
  • Modal Phase Collinearity (MPC)
  • Mean Phase Deviation (MPD)
  • Phase scatter

Some examples of the experimental modal analysis techniques that SINT Technology can use are:

 

  • Impulse excitation (instrumented hammer)
  • Controlled excitation (shaker)
  • Operational Modal Analysis (OMA)
  • Operational Deflection Shape (ODS)

Experimental Modal Analysis standards

ISO 7626-2

Vibration and shock - Experimental determination of mechanical mobility - Part 2: Measurements using single-point translation excitation with an attached vibration exciter

 

 

ISO 7626-5

Vibration and shock - Experimental determination of mechanical mobility - Part 5: Measurements using impact excitation with an exciter which is not attached to the structure