I have modelled a cantilever beam using a shell model and run the model for modal analysis. The numerical and hand calculations are not converging, especially for higher modes. Do you have an idea why this happens?
I think the answer is the element type you used for analysis (Shell). There would not be such a big difference between theoretical formula and FE analysis for bending modes if you use elements like beam.
Gholamreza Zamani Ahari I tried wire, shell, and solid. The wire and shell models have almost the same results. However, the wire model doesn't show torsional modes.