Hi to all,
How do you present mode shape vectors from each mode after performing modal analysis?
I would like to compare the mode shape vectors from numerical analysis with experimental analysis and establish the Modal Assurance Criterion (MAC).
Solved! Go to Solution.
Solved by Pawel.Pulak. Go to Solution.
Solved by Artur.Kosakowski. Go to Solution.
Press the RMB on the table with results of modal analysis and select table columns. Switch to the Eigenvectors tab.
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i didnt undesrstand what is RMB .in modalanalysis environment i am getting only frequency results. i cant see any table. i need to have mode shape vectors .kindly help me with this
RMB - right mouse button
Click on table using right mouse button then select Columns....
i am working in autodesk inventor for modal analysis.i got first 10 modes.but i need to have mode shape vectors to compare with experimental results.i am attaching image of my result.please suggest looking at the figure.
This is Robot forum, not Inventor.
Inventor http://forums.autodesk.com/t5/Autodesk-Inventor/bd-p/78
To vertify my structure i have used matlab and plottet the eigenvectors. I am trying to compare the results from robot with the results from matlab. is there a smart way to get the eigenvectors ou from robott.. all i seem to get are -0 +0 and 1 -1 ?
I was also wondering if Robot take into acount crackling of the concrete by code reduction factors for shear and flexular deformation when preforming a modal analysis?
To vertify my structure i have used matlab and plottet the eigenvectors. I am trying to compare the results from robot with the results from matlab. is there a smart way to get the eigenvectors ou from robott.. all i seem to get are -0 +0 and 1 -1 ?
See below
I was also wondering if Robot take into acount crackling of the concrete by code reduction factors for shear and flexular deformation when preforming a modal analysis?
No , reduce E or section properties by your own
Example:
Regarding the Eigenvectors, what is the normalization criteria used? Are all the components of the eigenvector normalized individually, or are they normalized relative to eachother? If they are relative, how is the relation between length components and rotation components taken into account?
Thanks,
Jose
The components of the eigenvector are normalized relative to each other.
The relation is "unit independent" because values of rotation components correspond to tangents of appropriate rotation angles.
Regards,