Modal Analysis Question -- 3D and 2D Models Finding Different Results

[byale292]

I am performing a modal analysis of a simple (rectangular cross section) cantilever beam and comparing the natural frequencies provided by the model to experimental data. When I model the beam as a 3D deformable solid, the natural frequencies come out to be approximately an order of magnitude too low. When I use a 2D wire model and assign a beam section however, the results come out almost perfectly compared to the experimental data. All material properties and other settings are the same and I am very confused as to why these two models are outputting such different values. Any help would be greatly appreciated.

Thank you!

-Brian

 

[bkal]

What solid element type are you using and how many elements do you have in each direction?