Modal Analysis of Cantilever Beam - Clamped fixture

[sd90]

Hi

I am trying to do a modal analysis a cantilever beam which has a total length of 36 inches. It is fixed at one end using a clamp which has a length of 1 inch. So, in my mind, the effective length that is 'free' to oscillate is 35 inches. The question is, would it be a reasonable to assume the length to be 35 inches and have it fixed by one face, or would it be more wise to use split lines and apply a fixed support over 1 inch of the beam?

Thanks

 

[btrueblood]

Depends on how rigid your clamp is in the real world, i.e. its stiffness vs. that of your beam.

 

[GregLocock]

In my long experience with reality vs FEA it has often been necessary to include the mounting system in the FEA model, ie model the IUT AND the rig that holds it.

Cheers

Greg Locock


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