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Damping Function in response simulation

Hi,

 

I am analyzing example problem of response spectrum analysis. To understand the influence of Critical damping Vs Frequency, I have run analysis with various damping values but I cound see all results are same and didn't have any influence in damping. Can some one help me to understand the Critical damping Vs Frequency in Nx Nastran.

 

Thanks in advance.

 

Thanks and bets regadrs,

Bala.K