Abstract:

On the base of theoretical and wide experimental investigation were developed the new method of determination sound absorption coefficient in materials. The modern digital technique and software give the ability that the sound absorption coefficient was measured directly with the help of waveforms of damping sound waves in an impedance tube, i.e. by the relation of reflected and incident waves but not by bypass ways as it is done in the present. The presented method ensures more stable measuring beyond laboratory conditions with no precision devices and it is comfortable in a wide consumption

Keywords: sound absorption; materials; amplitudes decay; sound waves