An innovative composite plywood for the acoustic improvement of small closed spaces
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Francesco Negro
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.
Acknowledgments
The experimental activity reported in this paper was realized within the OPTISOUNDWOOD project, granted by the Piedmont Region in the framework of the EU Rural Development Plan 2007–2013, Action 124.2 “Cooperation for the development of innovative products, processes and technologies in the forest sector – Innovation in forest field”.
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Articles in the same Issue
- Frontmatter
- Effects of thermo-hygro-mechanical (THM) treatment on the viscoelasticity of in-situ lignin
- 2D NMR characterization of wheat straw residual lignin after dilute acid pretreatment with different severities
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- Influence of strain rate, temperature and fatigue on the radial compression behaviour of Norway spruce
- Effect of conditioning history on the characterization of hardness of thermo-mechanical densified and heat treated poplar wood
- An innovative composite plywood for the acoustic improvement of small closed spaces
- Antioxidant activity of Scots pine heartwood and knot extractives and implications for resistance to brown rot
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Articles in the same Issue
- Frontmatter
- Effects of thermo-hygro-mechanical (THM) treatment on the viscoelasticity of in-situ lignin
- 2D NMR characterization of wheat straw residual lignin after dilute acid pretreatment with different severities
- Determination of inorganic element distribution in the freeze-fixed stem of Al2(SO4)3-treated Hydrangea macrophylla by TOF-SIMS and ICP-AES
- NMR determination of sorption isotherms in earlywood and latewood of Douglas fir. Identification of bound water components related to their local environment
- The combined effects of initial microfibrillar angle and moisture contents on the tensile mechanical properties and angle alteration of wood foils during tension
- Fatigue behavior of Japanese cypress (Chamaecyparis obtusa) under repeated compression loading tests perpendicular to the grain
- Influence of strain rate, temperature and fatigue on the radial compression behaviour of Norway spruce
- Effect of conditioning history on the characterization of hardness of thermo-mechanical densified and heat treated poplar wood
- An innovative composite plywood for the acoustic improvement of small closed spaces
- Antioxidant activity of Scots pine heartwood and knot extractives and implications for resistance to brown rot
- Quantitative observation of the foraging tunnels in Sitka spruce and Japanese cypress caused by the drywood termite Incisitermes minor (Hagen) by 2D and 3D X-ray computer tomography (CT)
