Vibration problem of the smoke extractor
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The vibration of the smoke exhaust fan remains stable at around 50; its shaft orbit is elliptical. Today, the unit was operated at reduced capacity, resulting in a decrease in the inlet pressure and inlet temperature at the leak point. The vibration of the smoke extractor is very large; the axis trajectory shows an 8-shaped pattern, with the amplitude at 0.5 times the frequency increasing. What is the cause?
Semi-frequency eddy. There’s a problem with the bearing bush.
What is the harmonic frequency at 50 vibrations?
Vorticity is below the half-frequency, around 0.4–0.5; this one is exactly 0.5
The weight distribution from the fan to the blades is asymmetric; dynamic balancing is required
Could you share any learning materials on how to read spectra? Thank you