Frequency clarification
Frequency clarification
(OP)
I get peculiar results from turbine rotor. Adding constraints to bearing locations lowers natural frequencies. Higher frequencies with no constraints comparing to same mode shapes as in constrained model. No damping included at bearing locations. Beam and shell elements are used. Adding any constraints should add onto natural frequencies, right?
Thanks a bunch
Thanks a bunch





RE: Frequency clarification
But, this does not always increase the frequencies, although I doubt the modes are truly identical. I am struggling to think of an example, but I think I've seen this in multibearing shafts before.
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Frequency clarification
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.