Reply To: Selecting # of Modes for good Mass Participation

[dlooman]

Generally, capturing a high percentage of the total mass is only important when doing a response spectrum analysis.  If that's the context, one thing to consider is using "missing mass" and not worrying about the ratio of effective mass to total mass.  What's the ultimate purpose of the modal?  As Deepak mentioned, there's isn't a capability in Ansys to extract enough modes to reach a certain percentage of the total mass.