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Below two Experimental Modal Analysis examples are shown. The first demonstrate the use of the internal impact testing module. The second demonstrate how to upload and analyze FRF’s obtained from third party software.
This example demonstrate the impact testing module as well as the two polyreference methods for EMA in ARTeMIS Modal. The structure is a symmetric steel plate with dimensions 300 x 300 x 8 mm. Two accelerometers has been mounted as references and the impacts were made in 16 positions in a 4 x 4 grid.
The test and analysis can be seen in the three YouTube videos below:
Part 1. Setting up an ARTeMIS Modal project for EMA
Part 2. Performing the actual impact testing
Part 3. CMIF Peak Picking and RFP-Z modal analysis
Below the final results are depicted.
Complex Mode Indicator Function – Peak Picking
When having multiple references there will be multiple singular value lines in the Complex Mode Indicator Function. In the case of a symmetric structure there will be multiple modes having more or less the same natural frequency. In this case the different modes are picked at the different singular values. This is necessary for three frequency location in the present example.
Rational Fraction Polynomial in Z domain (RFP-Z)
