Can I neglect certain modes when creating flexible bodies with OptiStruct for multi-body-analysis?

Denis Werner
Denis Werner New Altair Community Member
edited February 2022 in Community Q&A

Hi all,

I have a strcture that I use in a MB-Analysis. Therefore I'm employing a Craig-Bampton Condensation with OptiStruct. I noticed however, that there are quite a few modes that are irrelevant for my analysis and as I can't deselect them in the MB-Software I'm using I was wondering if there is a way to omit certain modes in the condensation process itself - does anyone know if and how this could be achieved? Thank you very much!

Best regards,

Denis

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Answers

  • paulel_22250
    paulel_22250 New Altair Community Member
    edited February 2022

    What MB software are you using?

  • Denis Werner
    Denis Werner New Altair Community Member
    edited February 2022

    I'm using AVL EXCITE Power Unit. The Format of the condensed models is the exb-format.

  • paulel_22250
    paulel_22250 New Altair Community Member
    edited February 2022

    I ask because MotionView/MotionSolve allows user to deactivate any mode that user thinks should not be included in the MB model. 

    Sorry, this does not help you if you are using AVL EXCITE.

  • Denis Werner
    Denis Werner New Altair Community Member
    edited February 2022

    No problem. I know that this options also exists in other software tools. However, with AVl this doesn't seem to pose a problem, so far I haven't observed single modes oscillating with unreasonable amplitudes in contrast to some other MB software ... Anyway, thanks for your trouble! 

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