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Modelling Viscous Damping in Modal Frequency Response Analysis

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Hi everybody,


I need to apply viscous damping properties (function of frequency) in a material card, to carry out a modal FRF. It's seems to be not possible. I don't find any help or suggestion on forum. 


Please help me.


Thank you in advance.



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Please refer below post for similar query.



You can also download recently released free ebook on OptiStruct Dynamic Analysis using below link.


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