Modal test: together with the shaft or impeller alone?

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When performing a modal test on a fan employing free-free boundary conditions, do you perform it on the impeller alone or on impeller mounted on the shaft?

I tend to think that impeller mounted on the shaft is the right way but why do I see just the impeller alone test?

Thanks

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Registered Member

Dave,
If your major concern is the tiny raised blades on a high speed wheel, the influence of the shaft is probably insignificant. If you care about the modes of the wheel itself, 1D, 2D, etc. then the shaft is necessary.
I would still do all testing with the shaft since it is the true platform the impeller will work from.
Ron Brook

8/20/135:58 AM

Registered Member

Ron,
Performed modal analysis on impellor with the shaft. Animation looks stunning. If interested I can email the avi file to a private address.

9/12/1312:09 PM

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