Measuring acoustic transmission loss using the 3-point method
Keywords:Acoustic intensity measurement, Acoustic wave absorption, Anechoic chambers, Data acquisition, Microphones, Reverberation, Wave equations, Acoustic transmission loss measurement, Microphone measurements, Sound absorbing materials, Sound pressure levels, Standing wave impedance tube, Three point method
AbstractTraditional measurement of transmission loss (TL) involved measuring sound pressure levels with and without the silencing element in place. As such, a 3-point method for measuring TL that can be performed entirely while the silencing element is in place is proposed. This 3-point method is shown to match the results of the traditional method very well. With this method, silencers can be tested for TL in field conditions for easier post-installation evaluation.
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