Damping Harmonic analysis

- March 4, 2020 at 1:41 pm
  
  Cri1994
  Subscriber
  
  Hello everyone,
  
  I have the damping Ratio that varies in the frequency range. How should i model it?
  
  This is my frequency range.
  
  In Analysis Setting I can put only one value of Damping Ratio.
  
  Can you help me ?
  
  Thanks a lot
  
  Cristiano
- March 4, 2020 at 2:01 pm
  
  ErKo
  Ansys Employee
  
  Look at the MDAMP command in the help manual.
  
  We can define a command snippet using the above command defining the damping ratio for each mode.
  
  Thus depending on the mode and its frequency you will add the damping ratio you have/showing in your graph/table.
  
  A sample command is (adding damping ratio to 6 modes):
  
  mdamp,1,.01,.04,.03,.04,.05,.06 ! specify modal damping for modes 1 to 6
  
  Best of luck
  
  Erik
- March 4, 2020 at 4:14 pm
  
  Cri1994
  Subscriber
  
  Thanks for Reply Erik,
  
  Please can you Show me an example?
  
  I've inserted this in commands but ANSYS does not read Nothing.
  
  Thanks a lot
- March 4, 2020 at 4:14 pm
  
  Cri1994
  Subscriber
  
  I've inserted this in Hrmonic Analysis.
- October 2, 2020 at 5:40 pm
  
  DMG
  Subscriber
  
  Hi Cri1994,nnI am new performing Harmonic Response analysis in ansys and have the exact same problem as you did.nMy intention is to verify an experimental analysis. I obtained the experimental damping ratio for each mode, but do not know how to implement it in my harmonic response analysis in ansys.nI have seen that you succeeded, but did not understand how you used this MDAMP command and where commands can be written.nCould you please explain this for me?nI would be very thankful!n