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Experimental Modal Analysis (EMA, OMA, ODS)


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

 

How to describe the dynamic behaviour of a structure and measure modal data

SINT Technology can determine the main modal parameters:

  • Natural frequencies
  • Mode shapes
  • Damping

The validation of the modes was done using the following:

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

How to validate modal data

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).

 

Experimental Modal Analysis: Data Acquisition Systems

SINT Technology uses multichannel data acquisition system up to 100 channels

  • LMS SCADAS SR02
  • LMS SCADAS SR05
  • LMS SCADAS SR09

NOTE: Available also for the installation for hazardous area

 

 

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