Comparison of Methods for Determining the Airflow Resistivity of Porous and Covering Materials

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Authors

  • Mykhaylo MELNYK Department of Computer Aided Design Systems, Lviv Polytechnic National University, Ukraine
  • Jarosław RUBACHA Department of Mechanics and Vibroacoustics, Faculty of Mechanical Engineering and Robotics, AGH University of Krakow, Poland
  • Artur FLACH Department of Mechanics and Vibroacoustics, Faculty of Mechanical Engineering and Robotics, AGH University of Krakow, Poland
  • Aleksandra CHOJAK Department of Mechanics and Vibroacoustics, Faculty of Mechanical Engineering and Robotics, AGH University of Krakow, Poland
  • Tadeusz KAMISIŃSKI Department of Mechanics and Vibroacoustics, Faculty of Mechanical Engineering and Robotics, AGH University of Krakow, Poland
  • Wojciech ZABIEROWSKI Department of Microelectronics and Computer Science, Lodz University of Technology, Poland
  • Marek IWANIEC Department of Biocybernetics and Biomedical Engineering, Faculty of Electrical Engineering, Automatics, Computer Science and Biomedical Engineering, AGH University of Krakow, Poland
  • Andryi KERNYTSKYY Department of Computer Aided Design Systems, Lviv Polytechnic National University, Ukraine

Abstract

This article compares two methods for determining the airflow resistivity of porous and coating materials – a key parameter in sound absorption modelling. The analysis involves a modified static airflow measurement procedure in accordance with International Organization for Standardization [ISO] (2018), using a linear approximation algorithm (PLA), and a reverse method consisting of matching the measured absorption coefficient in an impedance tube to the Miki model. The analysis was conducted on both porous materials utilised in acoustic panel fillings and thin coverings. It is evident that both methods yield analogous outcomes for materials exhibiting low resistivity. However, for materials characterised by higher resistivity, discrepancies of up to 50 % were observed. Nevertheless, a high degree of agreement was obtained between the calculated and measured absorption coefficients. For thin coating materials, an air gap of at least 70 mm is required. For materials with a thickness of up to approximately 30 mm, differences in resistivity do not significantly affect the absorption coefficient. It is evident that both methods can be used to determine the airflow resistivity of porous materials and layered structures, supporting the effective selection of materials according to requirements.

Keywords:

airflow resistivity, specific airflow resistance, sound absorption coefficient, impedance tube, porous materials

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