ls-dyna explicit damping

- July 19, 2023 at 9:10 pm
  
  Fady Elshazly
  Subscriber
  
  Hello,
  I am trying to consider different types of damping in one LS-DYNA model. For instance:
  
  1- To use mass damping added to frequency range deform damping
  2- To use more than one frequency range deform damping added together at similar or different frequency ranges
  can this cause any numerical inaccuracy or it is okay to apply this.
  
  Thanks
- July 20, 2023 at 5:33 pm
  
  Andreas Koutras
  Ansys Employee
  
  Hello Fady,
  You may use multiple *DAMPING_FREQUENCY_RANGE_DEFORM keywords only if each of these keywords is applied to a unique part set. If more than one *DAMPING_FREQUENCY_RANGE_DEFORM keywords are defined for a part, then the following Warning is produced. You can verify this with an example.
  - July 20, 2023 at 6:54 pm
    
    Fady Elshazly
    Subscriber
    
    so it is not possible to apply several ones at different frequency ranges for the same part?
    what if i use mass damping along with frequency damping for the same part?

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