Experimental Modal Analysis
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
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
Vibration and shock - Experimental determination of mechanical mobility - Part 2: Measurements using single-point translation excitation with an attached vibration exciter
Vibration and shock - Experimental determination of mechanical mobility - Part 5: Measurements using impact excitation with an exciter which is not attached to the structure