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Flexible body damping ratio

Hello,
 
I am trying to understand how the damping ratio is introduced to a flexible body in Adams. I understand that CRATIO acts as a percentage of the body's damping ratio but what I don't know is wether I should create a TABDMP card in the Nastran file when generating the MNF file or if the CRATIO statement does this exact same thing.
 
Thanks,
 
Josef K.
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