Radial Variation of Sound Absorption Capability in the Cross Sectional Surface of Yellow Poplar Wood

Kang, Chun‐Won; Lee, Youn-Hun; Huang, Kang; Kang, Wen; Xu, Huiran; Chung, Woo-Yang

doi:10.5658/wood.2011.39.4.326

Cited by 18 publications

(11 citation statements)

References 4 publications

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“…In recent research, permeability of wood is recognized as an important parameter in various applications such as heat-treated wood [3][4][5], nanomaterial impregnation [6][7][8] and use of the transverse surface of wood as a porous sound-absorbing material [9][10][11] Applying an appropriate drying schedule can improve the permeability of wood [12,13]. Impregnation of aqueous metal nanoparticles into heat-treated solid woods can improve its permeability because some of the wood's extractives dissolve, producing perforations and pits [14].…”

Section: Introductionmentioning

confidence: 99%

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An experimental study on change of gas permeability depending on pore structures in three species (hinoki, Douglas fir, and hemlock) of softwood

2020

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The purpose of this study is to analyze the pore structure for the heartwood, intermediate wood, and sapwood sections in three species of softwood (hinoki, Douglas fir, and hemlock) and to investigate the correlation of gas permeability depending on pore structure. For this study, gas permeability and pore size were measured by capillary flow porometry, and classification of a novel method was performed to determine the type of pores (through pores, blind pores, and closed pores) based on International Union of Pure and Applied Chemistry (IUPAC). Gas permeability, through pore porosity, and pore size increased from heartwood to sapwood. The results of multiple regression analysis showed that through pore porosity, mean pore size, and bulk density were significant factors affecting gas permeability.

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Section: Introductionmentioning

confidence: 99%

“…Thus, improving the permeability of wood has the advantages of drying defects, impregnation of chemicals, and sound absorption performance [3,10,11,13,16,17].…”

Section: Introductionmentioning

confidence: 99%

An experimental study on change of gas permeability depending on pore structures in three species (hinoki, Douglas fir, and hemlock) of softwood

2020

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“…However, there is a large deviation among the species of trees in terms of the size of the diameter of the vessel, the form of the perforation plate between vessel, and the rate of the vessel. Kang et al (2011) reported that the cross-section of yellow poplar exhibits large-diameter and high-porosity vascular tissues, offering excellent sound absorption performance that there are different sound absorption coefficients in radial direction between heartwood and sapwood (Kang et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on the Gas Permeability, Sound Absorption Coefficient, and Sound Transmission Loss of Paulownia tomentosa Wood

Kang¹,

Jang²,

Jang³

et al. 2019

Journal of the Korean Wood Science and Technology

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In this study, the gas permeability, sound absorption coefficient, and sound transmission loss of the Paulownia tomentosa wood were estimated using capillary flow porometry, transfer function method, and transfer matrix method, respectively. The longitudinal specific permeability constant of the Paulownia tomentosa wood with a thickness of 20 mm was 0.254 for the control sample and 0.279, 0.314, and 0.452 after being subjected to heat treatments at 100 °C, 160 °C, and 200 °C, respectively. The gas permeability was observed to be slightly increased by the heat treatment. The mean sound absorption coefficients of 20-mm thick Paulownia tomentosa log cross-section for the control sample and after being subjected to heat treatments at 100 °C, 160 °C, and 200 °C were 0.101, 0.109, 0.096 and 0.106, respectively. Further, the noise reduction coefficients of 20-mm thick Paulownia tomentosa log cross-section of the control sample and after being subjected to heat treatment at temperatures of 100 °C, 160 °C, and 200 °C were 0.060, 0.067, 0.062 and 0.071, respectively. The mean of sound transmission loss of the 20-mm thick Paulownia tomentosa log cross-section was approximately 36.93 dB. Furthermore, the gas permeability and sound absorption coefficient of the heat-treated Paulownia tomentosa discs slightly increased depending on the heat treatment temperature; however, the rate of increase was insignificant.

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“…The sound absorption rate of polyester board attached CLT wood specimens was increasing with increasing of frequency, which is a typical characteristic of porous sound absorber. (Kang et al, 2011;Kang et al, 2012c) The sound absorption rate of polyester board attached CLT wood panels was 0.4 at 1000 Hz, 0.35 at 1000…”

Section: Resultsmentioning

confidence: 98%

Sound Absorption Rate and Sound Transmission Loss of CLT Wall Panels Composed of Larch Square Timber Core and Plywood Cross Band

Kang¹,

Jang²,

Kang³

et al. 2019

Journal of the Korean Wood Science and Technology

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The square timbers of larch having cross section of 90 mm × 90 mm were glued laterally to be formed 1,200 mm × 2,400 mm panels which were used as cores for CLT wall panels. Then, structural plywood panels having size of 1,200 mm × 2,400 mm were used as cross band covering the small square timber cores to manufacture CLT wall panels. The sound absorption rate of CLT wall panels and polyester board attached CLT wall panels were investigated. The mean sound absorption coefficients of the former and the latter in the frequency range of 100-6400 Hz were 0.21 and 0.74, respectively. The noise reduction coefficients (NRC) of those were 0.21 and 0.40, respectively. Also, the mean sound transmission loss of CLT wood panel in the frequency range of 50-1600 Hz was 45.12 dB and that value at the frequency of 500 Hz was 42.49 dB. It was suggested that the polyester board attached CLT wall panels could be used as housing wall because of its high sound absorption rate and high sound transmission loss.

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Radial Variation of Sound Absorption Capability in the Cross Sectional Surface of Yellow Poplar Wood

Cited by 18 publications

References 4 publications

An experimental study on change of gas permeability depending on pore structures in three species (hinoki, Douglas fir, and hemlock) of softwood

An experimental study on change of gas permeability depending on pore structures in three species (hinoki, Douglas fir, and hemlock) of softwood

Effect of Heat Treatment on the Gas Permeability, Sound Absorption Coefficient, and Sound Transmission Loss of Paulownia tomentosa Wood

Sound Absorption Rate and Sound Transmission Loss of CLT Wall Panels Composed of Larch Square Timber Core and Plywood Cross Band

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