Vibration oscillation(With Low frequency) on a Belt driven Fan

Long Time Signal

Motor Speed: 2950 RPM

Fan Speed: 3862 RPM

In your opinion, What is the cause of this vibration oscillation?Maximum Vibration oscillation is at point 3V(DE FAN.Vertical)

in the attachment, you can see the:  Slow Motion of Belt moving, FFT and Part of Time Signal, Long Time Signal, Sound of Vibration

thanks all

Attachments

Photos (2)
Videos (1)
Super slow motion of Belt moving
Audio (1)
Original Post

Have you inspected belts and sheaves for damage and excessive wear? Did you measured and corrected belt sheave alignment? Have you measured and corrected belt tension? The waveform plot labeled "one cycle of fan" shows about 8-cycles per 0.2 seconds or 40-Hz or 2400 cpm. This is lower than the stated motor and fan speeds, so it may be a belt resonant frequency.

Walt

Have you performed a bump test to check for resonant frequencies that may coincide with fundamental operating frequencies of your system?

Also consider checking all the hold down bolts for looseness, degradation, and ensure that the washers are properly sized. 

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