Reduction
Acoustic quieting is the process of making machinery quieter by damping vibrations to prevent them from reaching the observer.
When two identical industrial noise sources are side by side producing a recorded noise at 100 dB(A) the reduction in noise from shutting off one of the noise sources is about 3 dB resulting in 97 dB(A).
When one doubles the distance from a noise source the recorded noise level is reduced by 6 dB. This is also called the Rule of 6. This is based on the fact that the equation to calculate noise attenuation at a distance, knowing the SPL at distance is given by, where d is the distance. If the distance is doubled, the equation simplifies to which equals 6.02 (or approx. 6)
Read more about this topic: Industrial Noise
Famous quotes containing the word reduction:
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—Jimmy Carter (James Earl Carter, Jr.)