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significance of natural frequency

Discussion created by 1-6IQYAK on Jun 20, 2007
Latest reply on Jun 21, 2007 by genexxer genexxer

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dear forum member,
in dynamic analysis , what are the significance of natural frequency?
if natural frequency is high, structure weak or strong?

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genexxer genexxer Jun 21, 2007 2:31 AM
If the natural frequency is high, generally it means the stiffness is relatively high and the mass is relatively low. The relation f = root(k/m) applies for the first natural frequency. The geometry, Young's modulus, density and boundary conditions are the influencers in the elevation of natural frequency. Strength is a material property and isn't used in the computation of natural frequency, nor is the structure stronger simply due to high natural frequency. I find that using draft quality elements always gives erroneously high natural frequency when bending is in the mode shape. So I avoid them for almost all simulations, except maybe a cylinder in pure axial load.
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