Low Frequency Vibration
Low Frequency Vibration
(OP)
This machine has 3 rotating assembles that run at 13.6 Hz, 17 Hz and 19.7 Hz. I am seeing a very strong 3.4 Hz signal which translates into a very large displacement. I can't figure out the source. It only exists when the machine is running other nearby operations don't contribute. The closest thing I found is a bearing FTF at 5.5 Hz.
I'm at a loss, any ideas?
I'm at a loss, any ideas?





RE: Low Frequency Vibration
RE: Low Frequency Vibration
RE: Low Frequency Vibration
We also have bellow actuators in the system. they have a natural freq near 3Hz. Still, a forcing frequency near that freq would be necessary to excite.
Another clue; we tested this same exact machine on the same test stand in May. responses are consistent with the exception of this 3.4Hz.
Any other thoughts?
RE: Low Frequency Vibration
Why would you think that?