antiresonances at the critical speed
antiresonances at the critical speed
(OP)
Hello.
I'm working with an horizontal rotor that has three planes of measure, one at one bearing and the other two at the shaft. Each plan has two transducers, one at the horizontal direction and the other at the vertical direction.
When the rotor is driven beyond the first forward critical speed, the two measuring planes at the shaft show anti resonances at the forward critical speed and also at the backward critical speed. The antiresonances are found in the vertical direction only, the horizontal direction shows the traditional peaks.
Please, could you help me to understand that?
Thank you!
I'm working with an horizontal rotor that has three planes of measure, one at one bearing and the other two at the shaft. Each plan has two transducers, one at the horizontal direction and the other at the vertical direction.
When the rotor is driven beyond the first forward critical speed, the two measuring planes at the shaft show anti resonances at the forward critical speed and also at the backward critical speed. The antiresonances are found in the vertical direction only, the horizontal direction shows the traditional peaks.
Please, could you help me to understand that?
Thank you!





RE: antiresonances at the critical speed
RE: antiresonances at the critical speed
I didn't understand the gull wing resonance. When I look the displacement curves, the results are just like you said. How could the runout counteract the resonance peak?
Thank you very much!
RE: antiresonances at the critical speed
Just to say that I found a paper on the dynamics of a bowed rotor that confirms what you said!!!
The paper is "A Note on Jeffcott Warped Rotor" by J. S. Rao (Mechanism and Machine Theory 36).
Now you see why you got a star :)
Thank you!!!
RE: antiresonances at the critical speed
RE: antiresonances at the critical speed
Thank you!!!
RE: antiresonances at the critical speed
If you are running a rotor kit of the kind Bently Nevada makes, then it is very common to have a bowed rotor due to the way the disks attach to the shaft. In that case, loosen the disks, and reattach being carful to evenly torque the screws on each side of the disk.
RE: antiresonances at the critical speed
It's a turbine, not a rotor kit.
Thank you for helping me, sms.