An innovative composite plywood for the acoustic improvement of small closed spaces

Abstract

Poor acoustics is a common problem in many small closed rooms such as offices or dining rooms. Sound absorbing panels used as wall or ceiling coverings can be a remedy. In the present paper, the sound absorption properties of a composite made of two plywood skins bonded to an inner honeycomb core of plywood cells, designed by the authors in a previous study, were improved by drilling the surfaces. The holes communicate with the void cells of the core, activating the Helmholtz resonance effect. The acoustic behavior of small specimens and final-size samples are described, which were also tested in a reverberation chamber and in a real dining room. The developed lightweight composite plywood achieved αmax 0.90 values (maximal sound absorption coefficients) around 400 Hz, i.e. in the low frequency range, resulting in being well suited for various acoustic improvements.

Çapraz lamine ahşap panellerin (CLT) ara katmanına uygulanan perforasyon işleminin levhaların ses yutma katsayısı değerlerine etkisinin incelenmesi

“…Dolayısıyla ses yutma seviyeleri yüksek olan malzemeler yüksek gözeneklilik olma eğilimine sahiptirler (Cox and D'Antonio, 2009) Ses yutuculuğu frekansa göre değişkenlik göstermektedir . Özellikle perforasyonlu panellerde ses yutma katsayısı 500 Hz ve 1000 Hz seviyelerinde gerçekleşmiştir (Negro et al 2010). Yapılan diğer bir çalışmada ise düz yüzeyli panellerde en iyi ses yutma katsayısının 160 Hz ile 200 Hz frekans seviyelerinde, delikli yüzeylere sahip panellerde ise en yüksek ses yutma katsayısı ise 400 Hz ile 600 Hz frekans seviyelerinde meydana gelmiştir (Altınok ve Ayan, 2012).…”

The Effect of Wood Veneer Type on the Reduction of Sound Transmission Between Noise-Producing Interior Spaces in Buildings

“…Studies have shown that wood materials provide sound insulation thanks to their ability to absorb sound [14] and their sound absorption values depend on the type of wood used [15,16] the inner layer structure of the wood material [12], the perforated structure [17], heat treatment [18], and the type of varnish used [19].…”

Sound Insulation Performance of Furfuryl Alcohol-Modified Poplar Veneer Used in Functional Plywood

“…Light-weight wood materials, which are beneficial in reducing energy consumption, have been an exciting and innovative alternative in construction systems. Among them, plywood is a long-standing wood product with various applications in furniture [2,3] and interior renovation [4]. However, due to its low density, the sound insulation performance of plywood is not ideal and cannot meet the standards of sound insulation in buildings [5].…”