Ansys Learning Forum Forums Discuss Simulation General Mechanical Impact of the damping ratio in SV and DMPR command Reply To: Impact of the damping ratio in SV and DMPR command

dlooman
Ansys Employee

The damping ratio value on the SV command is only used when there are multiple spectrums specified with different damping values.  For example, there might be a spectrum based on 2% damping and SV,.02 would be specified for it.  A spectrum based on 5% damping would have SV,.05.  In APDL the damping specified with dmpr will be used to interpolate between the spectrums.  Since damping is already accounted for in the spectrums, it doesn't have the usual effect of damping the results.  It does affect the coupling coefficients of certain combination methods.  Mechanical doesn't have the capability to specify multiple spectrums so the damping input on the SV command doesn't apply to it.