Abstract
From modern buildings to public spaces are made of concrete, steel, and glass. These materials increase propagation of sound and the reverberation time. Therefore, furniture should be good sound absorbers in such places. The objective of this study was to ascertain acoustic properties of wood-based materials by determining normal acoustic impedance on the surface and sound absorption coefficients. Experiments were carried out on 17 types of wood-based materials commonly employed in furniture design and manufacture. Investigations were conducted based on the transfer-function method. It was demonstrated that for frequencies between 125 and 500 Hz, the highest capability of sound absorption was determined of low surface layer density and high porosity. Honeycomb panels with paper core absorbed better sounds in the range between 1 and 2 kHz. Panels of considerable external surface irregularities were characterized by the most favorable acoustic properties for the frequency of 4 kHz.
Acknowledgments
This work was supported by the Polish National Centre for Research and Development under the grant “Passive acoustic materials for furniture production”. Authors are grateful to MSc Edward Kuśnierz and MSc Karol Łabęda for creating excellent laboratory conditions and preparing the samples for testing.
Funding: Polish National Centre for Research and Development, (Grant/Award Number: ’Passive acoustic materials for furniture productio’)
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