Calcolatore Perdita di Trasmissione Sonora — Formula

Mass Law for Sound Transmission Loss

The mass law gives the theoretical TL of a single homogeneous panel.

Formula

TL = 20 log10(f m) - 47.3 dB

  • *f* = frequency (Hz)
  • *m* = surface mass density (kg/m2)

    • Doubling the mass or frequency increases TL by about 6 dB. This is the field-incidence mass law, valid below the coincidence frequency.

    Esempio Risolto

    20 kg/m2 concrete panel at 500 Hz.

    1. TL = 20 log10(500 * 20) - 47.3
    2. TL = 20 log10(10000) - 47.3
    3. TL = 20 * 4 - 47.3
    4. TL = 80 - 47.3 = 32.7 dB