Eurotec catalogue fastening technology Page 272
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Timber engineering In the next step, we take a closer look at the interference frequency. To this end, we look at the graphs below and can thus conclude that the sound reduction in the low frequency range has deteriorated. Low frequencies (basses) can only be isolated by mass. The frequencies to be isolated for building acoustics start in the 80 Hz range, so this is negligible. 80 Hz can be assumed if no interference frequencies are specified. The sound reduction in dB can be determined in two ways: Transmission factor [dB] 1: Based on an interference frequency of 80 Hz, a sound reduction of approx. 17 dB can be read off the following graph. These values are achieved under ideal conditions (optimum room temperature, room humidity, etc.). 20,00 15,00 10,00 5,00 0,00 0 20 40 60 80 100 120 140 160 -5,00 -10,00 -15,00 -17/80 -20,00 -25,00 -30,00 Disturbing frequency [Hz] 2: A sound insulation factor can be calculated from the natural frequency identified previously (27 Hz) and the specified interference frequency (80 Hz). Sound insulation factor f/f0: Interference frequency / natural frequency → 80 Hz / 27 Hz ≈ 2,96 © samserius – stock.adobe.com The sound reduction can then be read off based on the factor calculated previously. This is 17 dB under ideal conditions. 272
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