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Dynamic Balancing

- What is it?
A procedure to modify the center of gravity of a rotating element.

- Why balance a fan?
Excessive vibration is tough on machinery.  It reduces component life, increases stress, causes noise, increases power consumption, and in extreme cases, results in dangerous running condition and possbile catastrophic failure.  Unbalance is the single most common cause of excessive fan vibration.

- How is it done?
For single-plane balancing, a balancing instrument uses two sensors, speed and vibration, in order to measure the amount of vibration (amplitude) and location (phase).  Multiple sensors can be used for multi-plane balancing.  The instrument then calculates a correction based on adding or removing a specific weight at a specific location.  Correction is made, and the procedure is repeated until the required residual unbalance level is obtained.