differance on results

durukanbdilek

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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Adriano_Koga

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.