One of the main sources of machinery noise is structural vibration caused by the rotation of poorly balanced parts, such as fans, fly wheels, pulleys, cams, and shafts. Measures used to correct this condition involve adding counterweights to the rotating unit or removing some weight from the unit. A familiar noise caused by imbalance is in the high-speed spin cycle of washing machines. The imbalance results from clothes being unevenly distributed in the tub. By redistributing the clothes, balance is achieved, and the noise ceases. This same principle of balance can be applied to furnace fans and other common sources of such noise.
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