I work at Cold Rolling Mill. There are several mill motors as big as 2 MW with 15 kW a blower. The blower is attached/suspended horizontally at motor outboard side and acts like a cantilever beam.
When I took the vibration for the first time, it was found unacceptable as per ISO 10816 mostly in vertical direction which is higher at outboard than inboard side. But spectrum was smooth and only 1X was observed appearing to me as structural resonance.
I feel that it should be normal as in case of cantilever, the side which is away from fixed support has most deflection, that is why we are seeing vibration in vertical direction.
What are your thoughts? How to reduce it?