My problem was that I was not able to match the numerical frequencies corresponding to the bending mode shapes with the ansys result. I read about BEAM4 element, but the results are still not accurate. I have attached the properties of the model and the natural frequencies corresponding to the 20 mode shapes have been shown in the table along with the ANSYS result. It would be very helpful if you can help me to identify that whether there is some limitation in the ANSYS software for this geometry or something else. Dimensions of 3D beam: 150mm x 150mm x 700mm
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