General Mechanical

General Mechanical

Frequency dependant damper

    • gryphus
      Subscriber

      Hi,

      is it possible to change the damping value of a COMBIN14 (or similar) element in the substeps of a harmonic simulation?

      Could this be used to simulate a frequency dependant damper? Or is there a different solution?

    • peteroznewman
      Subscriber
      Rayleigh Damping uses two constants, alpha and beta, to create Frequency Dependent damping. I recently wrote about that on September 24 in this discussion:
      https://forum.ansys.com/discussion/comment/133165#Comment_133165
    • BenjaminStarling
      Subscriber
      You can make the COMBIN14 stiffness and damping frequency dependant, but will require some scripting to acheive if you are working in Mechanical.


    • gryphus
      Subscriber
      Thanks Benjamin!
      That was exactly what I was looking for.
      Since the real constants you posted only list harmonic, transient and static, does this mean the frequency dependancy does not work for modal analysis?
    • BenjaminStarling
      Subscriber
      This is correct. A modal analysis has no context of what frequencies will be available until the extraction is complete, and the stiffness and damping of the model determines what modes/frequencies are available.
    • Baloch
      Subscriber
      Is it possible to model a non-linear spring in terms of displacements? Meaning spring's damping and stiffness should vary based on displacements.
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