Rotational Resonant Frequency

Discussion created by Brian Dempster on May 16, 2007
Latest reply on May 16, 2007 by genexxer genexxer

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I need to predict the Rotational Resonant Frequency of a round diskmounted to a shaft.
Setup for Natural Resonant Frequency is straight forward and Idon't have any problems. I have tried fully restraining the shaftand restraining the disk in every direction except rotational.

The results are many times lower then I would expect. Am I settingup the model correctly, or is there a better way?

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genexxer genexxer May 16, 2007 7:41 PM
Classical closed form theory says that its always mass, stiffness, damping and restraints that natural frequency values depend upon. In FEA, the type and number of elements can also have a strong effect. For modes that involve bending, I always use high quality elements. For bending, draft elements don't cut it since the lack of mid side nodes makes the possibility of simulating the curvilinear nature of bending remote. BTW, natural frequency's weaker dependence upon damping isn't simulated by the solver in 2007.
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Rotational Resonant Frequency

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