I have a piece of rotating machinery that is experiencing vibration and noise in the 200 to 300 RPM range on powered deceleration. The noise and vibration is gone when coasting to a stop. No noise or vibration on acceleration. This speed range is also a natural resonance point for this machine but the vibration is considerably higher with the powered deceleration. I have seen many reports of torsional torque harmonics at specific speeds but nothing during deceleration.
Has anyone ever seen this or have any suggestions? Without the noise happening while free wheeling we do not believe it is a mechanical issue.
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