To design a sound-absorbing panel, it is important to identify factors that affect the maximum sound absorption of low, middle and high frequency sounds). Perforation effect is very important for the noise-reducing and noise-absorbing panels. Perforations often is used for sound reduction. Experimental data shows that the perforation is very effective to absorb low-frequency noise. In the presented study, analyzed influence of perforation coefficient of noise reduction with theoretical and experimental methods. The experiments were conducted in noise reduction chamber using an perforated construction with glass wool filler.

Keywords: perforation effect, sound absorption, constructions, low-frequency sound.

DOI: https://doi.org/10.3846/enviro.2017.027