Modal analysis for rotating systems

David_Lindberg_1
David_Lindberg_1 Altair Community Member
edited June 2023 in Community Q&A

Hi,
I'm trying to perform a rotational dependent modal analysis (linear) in Motionview for a simplified rotor system. The task is to investigate eigenmodes associated with the blade joints at different rotor frequencies.  How do I perform multiple modal analyses with varying rotor frequency?

Or alternatively, how do I define a modal analysis with a a defined motion (e.g. 1/2 nominal rotor freq.) as previous step? Currently, the linear analysis option changes the motion to fixed, thereby eliminating the effect of motion. "Static + linear" option sound promising, but the static step is difficult to perform since the rotor needs time to speed up (just as in reality).

Any ideas? See simplified model included.

Cheers,
David

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Answers

  • David_Lindberg_1
    David_Lindberg_1 Altair Community Member
    edited June 2023

    Hmm, seems that this simplified model of mine actually does work just as intended. "Static+linear" seems to do just what I was looking for. 

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