Belt Driven Fan Vibration

Loosening of hardware on the fan or deterioration of the structure and hardware supporting the fan.

Belt driven fan vibration.

Belts along with electric motors shafts and pulleys are a critical component of power transmission in belt drive systems. It can be confirmed by measuring phase in the axial direction at fan speed. Both axial readings were in phase at running speed as determined by cross channel phase readings. Fan wheels may not be perfectly symmetric and may become out of balance due to a change in.

The axial vibration levels were high but slightly different on each bearing. Most vibration was at the fan shaft rotational frequency. When it is present the vibration at fan speed is typically the highest vibration peak in spectra taken on the motor. 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.

This vibration pattern is not typical for a belt drive. It is important to realize that some of the belt drive vibration problems listed above do not cause vibration at belt related frequencies. Eccentric pulley on the fan causes vibration at 1x rpm of the fan. Sheave misalignment is a very common problem with belt driven fans.

Vibration analysis is a condition monitoring test which is widely applied for determining the operating condition of any rotating machine for example centrifugal fan. In this report we will have to discuss problem of vibration for one centrifugal fan with the help of the vibration analysis technique.