Question: ( A ) - Vibration Case StudyExcessive vibration in a fanCentrifugal fan on foundation used to forceheated air over drying maltSpecification: 2 . 5 m

(

) -

Vibration Case StudyExcessive vibration in a fanCentrifugal fan on foundation used to forceheated air over drying maltSpecification:

2.5

m dia impeller. Spherical roller bearings. Multiple v

-

belt drive.Operation problems: Pulsations, on closure of inlet vanes

(

flowcontrol device

) .

Excessive vibration levels in spite of carefulimpeller balancing. Prominent second and third harmonics in thefrequency spectrum. When run down, irregular knocking noisesproduced.Also damage to machine identified on inspection: Failure of two

24

mm bolts holding steelpedestal to concrete foundation block. Partial disintegration of grouting betweenpedestal & foundation. Some damage to shaft surfaces wherebearings attached.

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