Belt Driven Fan Vibration

Fatigue type failure in fan components due to continued exposure to abnormal loads or vibration.

Belt driven fan vibration.

Both axial readings were in phase at running speed as determined by cross channel phase readings. In this report we will have to discuss problem of vibration for one centrifugal fan with the help of the vibration analysis technique. Most vibration was at the fan shaft rotational frequency. Belt drive problems and drive misalignment.

Sheave misalignment is a very common problem with belt driven fans. Fan wheels may not be perfectly symmetric and may become out of balance due to a change in. While belts require very little maintenance improper belt tension misalignment of pulleys mishandling of belts and environmental factors are common problems that can shorten the life of your belts and bring your system to a halt. Belts along with electric motors shafts and pulleys are a critical component of power transmission in belt drive systems.

It is important to realize that some of the belt drive vibration problems listed above do not cause vibration at belt related frequencies. The axial vibration levels were high but slightly different on each bearing. Problems due to the shafts or pulleys misalignment eccentricity etc cause vibration at 1x rpm of the component with the problem i e. It can be confirmed by measuring phase in the axial direction at fan speed.

Loosening of hardware on the fan or deterioration of the structure and hardware supporting the fan. Eccentric pulley on the fan causes vibration at 1x rpm of the fan.