69-05: Fan Noise Levels in Cooling Towers

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In this discussion, the word "noise" will refer to any undesirable air-borne sound, and "vibration" will apply to induced motion in mechanical components. We cannot always separate these two phenomena in our discussion, since mechanical vibration is usually a source of sound and is often part of a means by which sound is transmitted. If we make quantitative measurements, we recognize that noise instruments use microphones, detection motion of air, while vibration instruments detect motion in solid objects. Show more