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Negative Modal Frequencies

    • drwilkes7
      Subscriber

      Has anybody encountered the warning message below when conducting a damped modal analysis in ANSYS 2021 R2?

      The model consists of a rectangular plate suspended by body-ground longitudinal springs attached at the corners. The springs include longitudinal damping and the plate material also has material dependent-damping (damping ratio). Removing the longitudinal damping from the springs appears to alleviate the issue, while the material damping doesn't seem to change the result.

    • Chandra Sekaran
      Ansys Employee

      please repost the warning message

      • drwilkes7
        Subscriber

        Thank you very much Chandra Sekaran for replying. The warning message is below:

        Of course, changing the Frequency Display from 'Program Controlled' to 'All' will stop the actual warning message. My real interest is in what might cause non-conjugate pairs of complex frequencies to be calculated by the Full Damped Solver.

         

        Any help would be greatly appreciated.

         

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