METHOD OF DETERMINING MATERIAL SOUND ABSORPTION FACTOR Russian patent published in 2011 - IPC G01N29/04 

FIELD: physics.

SUBSTANCE: sound absorption factor is measured in generating sound field by deterministic signal in empty chamber and in that with tested material. Then, response signals are recorded to compute impulse responses, filter them out, determine sound pressure attenuation interval and compute material sound absorption factor. Note here that said deterministic signal represents that with exponentially increasing frequency while sound absorption factor is computed by interval of reverberation in empty chamber and in that with material via frequency range in 1/9 octave band followed by averaging of three magnitudes of adjacent bands.

EFFECT: higher accuracy.

2 dwg