differance on results

durukanbdilek
durukanbdilek Altair Community Member
edited June 2021 in Community Q&A

I m trying to determine modal characteristics of the alumina plate such as mode shape, modal frequencies numerically.

but obtained results and experimental results are different by %20.

material constants and dimensions are same.

boundary conditions clamped - free free free (CFFF)

what is a problem I don't know,

thank you for suggestions

 

best regards

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Answers

  • Adriano_Koga
    Adriano_Koga
    Altair Employee
    edited June 2021

    the basics of modal analysis is stiffness and mass.

    So in order to check, i would check if the mass of the plate is correct, compared to real world.

    If the mass is correct, then material properties. They can change a little bit, but not so much.

    Another important thing: How are you modelling your boundary conditions? And how are you modelling the interfaces/bolts, etc?

    These will affect stiffness of your model, thus frequency.

  • durukanbdilek
    durukanbdilek Altair Community Member
    edited June 2021

    Dear @Adriano A. Koga 

    clearly, I neglected bolt and other interactions

    I consider bc only constraint

    model was attached

    please help me

     

    best regards

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