Calculateur de Pollution Sonore (Avancé) — Formule

Combining Noise Sources

Sound levels in decibels are logarithmic, so you cannot simply add them. Two 80 dB sources produce 83 dB, not 160 dB.

Formula

Combined dB = 10 x log10(10^(L1/10) + 10^(L2/10))

OSHA Exposure Limit

Safe Hours = 8 / 2^((Combined dB - 90) / 5)

OSHA permits 8 hours at 90 dB, with halving for each 5 dB increase.

Exemple Résolu

Two machines produce 80 dB and 75 dB respectively.

  1. 10^(80/10) = 100,000,000
  2. 10^(75/10) = 31,622,776
  3. Sum = 131,622,776
  4. Combined = 10 x log10(131,622,776) = 81.2 dB
  5. Safe exposure = 8 / 2^((81.2 - 90)/5) = 8 / 2^(-1.76) = 27.1 hours