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It seem that the first mode is not local mode (see attached shape mode) but its participated mass is little so I do not know whether it is a problem of RSA?
Thank you for your enlighten me.
Solved! Go to Solution.
Solved by Artur.Kosakowski. Go to Solution.
http://forums.autodesk.com/t5/Autodesk-Robot-Structural/General-torsion/m-p/3807626
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