Air Devices
why are machines that suck or blow so noisy?
like the hair dryer or vacuum? anybody know the mechanics of noise-making air devices? can’t they be muffled?
noise or sound is a series of pulses in the air that we can detect with our ears. When the pulses are within our hearing range, generally about 30 to 20,000 cycles per second, our eardrums respond to the air pulsations and send a “sound” signal to the brain.
Fans and blowers spin fast enough to agitate the air and produce pulses within our hearing frequencies, and generally across a broad spectrum of frequencies (noise) rather than a pure, single-note pitch.
Noise can be muffled, as you suggested, but sometimes the solution is to stop the noise generation at the source. A large slow-spinning fan will generally be quieter than a fast-spinning fan, such in an hair dryer.
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