Reply To: Reaction forces and moments during random vibration at local coordinate systems

[dlooman]

Sorry.  As I said, I never tried it myself.  The way FSUM is performed for a PSD it actually could support RSYS, but apparently that wasn't enabled.  For a spectrum analysis the FSUM is performed on each mode separately and the modal fsum values are recombined.  I found that FSUM moments aren't in the local coordinate system even if you rotate the node, so that's not a workaround.  You could get the moments in a local coordinate system for an individual mode using RSYS and FSUM,RSYS and a mode factor equal to the square root of the variance.