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Disk vs blade natural frequencies

I'm trying to determine the coorelation of a blade natural frequency and disk (nodal diameter) natural frequency on a Turbine wheel in ANSYS Modal analysis.  Is it possible for a blade natual frequency to be excited even though a disk natural frequency is not being excited??  I'm having trouble determining if a blade frequency is related to any disk nodal diameter.  Thanks for any incite on this subject.

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npoEM's picture

Yes it is possible. Disk modal forms have nodal diameters and circles. All these nodals can be seen easy. 

At pictures you can see just disks forms (left - analitical, rigth - experimental) 

  

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