Modal analysis in workbench

  • Last Post 03 December 2018
MemoriseXuxu posted this 01 December 2018

Here I meet a problem about the damping modal in Workbench (ANSYS 18) .


how does the software calculate the stiffness coefficient ? I have found some guidance in this link but the result is not correct. 


I follow this public essay and I want to redo what he has done. But he only give the parameter above so I have a doubt that the parameter is enough to calculate. 

Hopefully I can get your guidance!

Thanks all guys!

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sk_cheah posted this 01 December 2018

Damping ratio is mode dependent. You could try approximating it via the stiffness and mass coefficient. Please see here for some documentation.

Kind regards,

MemoriseXuxu posted this 03 December 2018

But I also need to calculate the parameter using Damping Ratio so that I can calculate the stiffness and mass coefficient. So here the problem is still about the frequency the Ansys defined.Because the frequency above is a range of frequency but not a specific number.