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To get accurate results, you need at least 12 beam elements for each sinusoid along the beam.
For example, mode 2 has 1 sinusoid so 12 elements along the length is sufficient while mode 10 has 5 sinusoids so it needs at least 60 elements along the length. The higher modes need progressively more elements. It's okay to have more than the minimum number of elements.
How many elements do you have along the length for the tables you are showing above?
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