3. Experimental modal analysis#
Select from the menu « DA Tools > Modal analysis > Experimental Modal Analysis > EMA Polyreference Fitting »
\(\Rightarrow\) The « EMA Polyreference Fitting » widget appears in the main window.
Check the « Hammer Test » box on the widget.
Write « mart » in the text window where « Filter » is written in gray.
Select the « TimeSeries » entry from the tree and drag it into the « Reference » window.
Write « (?! mart) » in the text window where « Filter » is written in gray.
Select the « TimeSeries » entry from the tree and drag it into the « Response » window.
Click on the « Compute » button
\(\Rightarrow\) Frequency response curves appear in the graphics window.
Click on the « Proceed » button
\(\Rightarrow\) The second tab entitled « Pole selection » appears.
Enter 3 in the « Fmin » box.
Enter 12 in the « Fmax » box.
Select « Acceleration » on the « Format » line.
Click on the « Compute » button.
\(\Rightarrow\) A graph with a purple curve, red dots, and black crosses appears.
The purple curve has 2 peaks with 2 black cross lines. Place the mouse on one of the crosses on the first peak, click with the right mouse button and click on « Add Pole ».
Do the same on one of the black crosses on the 2nd peak.
\(\Rightarrow\) The frequencies and depreciations of the selected clusters appear in the « Selected Poles » window.
Click on the « Proceed » button.
Click on the « Compute » button.
\(\Rightarrow\) The calculated modal responses appear in the graphics window.
Click on the « Proceed » button.
In the tree, select the « Mesh » object and drag it onto the blue background of the new window.
\(\Rightarrow\) The mesh of the studied structure appears in the Viewer window.
To make the ColorBar appear: Go to the « Edit » menu, select « Preferences » and check the « Display color bar » box
