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Re: Resonance

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>Should I expect resonance problem? I'll appreciate any input. 
Very likely, although it's impossible to say without some indication of 
mode shapes. If you had a pure sinusoidal excitation and a lightly damped 
structure, the response at each resonance would be more severe but less 
likely to involve more than one mode. Real world excitation changes 
direction and normally involves a bandwidth of frequencies because it 
isn't sinusoidal.

How did you do the modal analysis?
What do the mode shapes look like?
What's the expected excitation compared to the general deformation for 
each of the modes?
Do the participation factors indicate some cross-talk between modes?
What's a rated frequency?

Christopher Wright P.E.    |"They couldn't hit an elephant at
chrisw(--nospam--at)        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)

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