Industrial Fan Service • Since 1952 • 24-Hour Call Line: 716-741-9445

Dynamic Balancing

In today’s industrial environment, we are surrounded by an increasing amount of complex rotating equipment that may include fan wheels, pump impellers, fly wheels, gears, impellers, rotors, cylinders, drums, and many other components of various shapes and sizes that must be balanced.

Excessive vibration in rotating machinery can cause unacceptable levels of noise and substantially reduce the life of shaft bearings. Ideally, all causes of vibration would be removed so that a unit runs completely "smooth." In practice, however, there will always be some inherent cause of vibration, or unbalance. The goal is to reduce imbalance to a level that minimizes noise and will not adversely affect bearing life.

Why balance?
Dynamic balancing ensures smooth and efficient operation of your rotating machinery. All rotating equipment exerts centrifugal forces that must be controlled. A balanced fan may exert forces evenly about its axis of rotation, while an unbalanced rotor may exert forces unevenly. This is due to the unbalanced rotor trying to shift from its operating center of gravity to the new actual center of gravity cause by the imbalance.

ACT Associates uses the latest technology to assure that your fan is checked and balanced. Our vibration analyzer enables the operator to correct any unbalance at different speeds by removing excess material as identified by the computer. We check and balance your rotating machinery, either at your plant or in our service facility.

What is the process?
If excessive vibration in your industrial fan or other rotating machinery is identified, ACT Associates provides dynamic balancing either at your facility or in our plant. Our 10,000-lbs. capacity means no job is too big or small.

Your industrial fan unit is placed on a balancing machine that has two sets of bearing pedestals connected to sensors. The imbalance at the two planes is identified independently for correction using computer analysis and control.

An important consideration during correction is how fast the unit will operate relative to its lateral-critical or “whirl speed.” If the unit will operate at a much lower rate than the whirl speed, then there is no need to balance the unit at the actual running speed.

When a unit is running near its lateral-critical speed, or in multi-speed situations, operating characteristics can be different from those when the unit runs well below this speed. Balancing is then conducted at running speed.


dynamic balance

Rotating machinery out of balance is caused by an effective displacement of the mass of the centerline from the true axis resulting from mass eccentricity in the unit.