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Structural Dynamics

Structural Dynamics

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  3. How can I get around the 1000 mode limit in a spectrum analysis? Can I run the spectrum analysis in segments?

How can I get around the 1000 mode limit in a spectrum analysis? Can I run the spectrum analysis in segments?

Tagged: 9, Mechanical APDL (f. ANSYS), Modal/Harmonic Response, structural-dynamics, structural-mechanics
    • March 17, 2023 at 9:00 am
      FAQFAQ
      Participant

      Yes, you could do a spectrum in segments. The participation factor of each mode is independent of the other modes that are used. If you are using the SRSS combination technique, the segment results can be SRSS’d together using LCOPER,SRSS in POST1. If you are using a method like GRP or CQC, solving in segments does lose the modal interaction between the modes near the cut-off frequency. I think this would be a small error, though.

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