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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.


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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