Air permeability and sound absorption coefficient changes from ultrasonic treatment in a cross section of Malas (Homalium foetidum)
Abstract We investigated the effect of ultrasonic treatment on Malas (Homalium foetidum) gas permeability and sound absorption coefficient using the transfer function method. Results showed a longitudinal average Darcy permeability constant of 2.02 (standard deviation SD 0.72) for untreated wood and...
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2021-01-01
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Online Access: | https://doi.org/10.1186/s10086-020-01940-w |
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doaj-72a8cd13e70a4e05a68c0e4b303224e72021-02-07T12:29:29ZengSpringerOpenJournal of Wood Science1435-02111611-46632021-01-016711510.1186/s10086-020-01940-wAir permeability and sound absorption coefficient changes from ultrasonic treatment in a cross section of Malas (Homalium foetidum)Chun-Won Kang0Eun-Suk Jang1Nam-Ho Lee2Sang-Sik Jang3Min Lee4Department of Housing Environmental Design, and Research Institute of Human Ecology, College of Human Ecology, Jeonbuk National UniversityDepartment of Housing Environmental Design, and Research Institute of Human Ecology, College of Human Ecology, Jeonbuk National UniversityDepartment of Wood Science & Technology, College of Agriculture & Life Sciences, Jeonbuk National UniversityDepartment of Forest Products, College of Agriculture & Life Sciences, Chungnam National UniversityDepartment of Forest Products, National Institute of Forest ScienceAbstract We investigated the effect of ultrasonic treatment on Malas (Homalium foetidum) gas permeability and sound absorption coefficient using the transfer function method. Results showed a longitudinal average Darcy permeability constant of 2.02 (standard deviation SD 0.72) for untreated wood and 6.15 (SD 3.07) for ultrasound-treated wood, a permeability increase of 3.04 times. We also determined the average sound absorption coefficients in the range of 50 to 6.4 kHz and NRC (noise reduction coefficient: average value of sound absorption coefficient value at 250, 500, 1000, and 2000 Hz) of untreated Malas. Those values were 0.23 (SD 0.02) and 0.13 (SD 0.01), respectively, while those of ultrasonic-treated Malas were 0.28 (SD 0.02) and 0.14 (SD 0.02), a 19.74% increase in average sound absorption coefficient.https://doi.org/10.1186/s10086-020-01940-wSound absorption coefficientTransfer function methodGas permeabilityUltrasonic treatmentMalas |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Chun-Won Kang Eun-Suk Jang Nam-Ho Lee Sang-Sik Jang Min Lee |
spellingShingle |
Chun-Won Kang Eun-Suk Jang Nam-Ho Lee Sang-Sik Jang Min Lee Air permeability and sound absorption coefficient changes from ultrasonic treatment in a cross section of Malas (Homalium foetidum) Journal of Wood Science Sound absorption coefficient Transfer function method Gas permeability Ultrasonic treatment Malas |
author_facet |
Chun-Won Kang Eun-Suk Jang Nam-Ho Lee Sang-Sik Jang Min Lee |
author_sort |
Chun-Won Kang |
title |
Air permeability and sound absorption coefficient changes from ultrasonic treatment in a cross section of Malas (Homalium foetidum) |
title_short |
Air permeability and sound absorption coefficient changes from ultrasonic treatment in a cross section of Malas (Homalium foetidum) |
title_full |
Air permeability and sound absorption coefficient changes from ultrasonic treatment in a cross section of Malas (Homalium foetidum) |
title_fullStr |
Air permeability and sound absorption coefficient changes from ultrasonic treatment in a cross section of Malas (Homalium foetidum) |
title_full_unstemmed |
Air permeability and sound absorption coefficient changes from ultrasonic treatment in a cross section of Malas (Homalium foetidum) |
title_sort |
air permeability and sound absorption coefficient changes from ultrasonic treatment in a cross section of malas (homalium foetidum) |
publisher |
SpringerOpen |
series |
Journal of Wood Science |
issn |
1435-0211 1611-4663 |
publishDate |
2021-01-01 |
description |
Abstract We investigated the effect of ultrasonic treatment on Malas (Homalium foetidum) gas permeability and sound absorption coefficient using the transfer function method. Results showed a longitudinal average Darcy permeability constant of 2.02 (standard deviation SD 0.72) for untreated wood and 6.15 (SD 3.07) for ultrasound-treated wood, a permeability increase of 3.04 times. We also determined the average sound absorption coefficients in the range of 50 to 6.4 kHz and NRC (noise reduction coefficient: average value of sound absorption coefficient value at 250, 500, 1000, and 2000 Hz) of untreated Malas. Those values were 0.23 (SD 0.02) and 0.13 (SD 0.01), respectively, while those of ultrasonic-treated Malas were 0.28 (SD 0.02) and 0.14 (SD 0.02), a 19.74% increase in average sound absorption coefficient. |
topic |
Sound absorption coefficient Transfer function method Gas permeability Ultrasonic treatment Malas |
url |
https://doi.org/10.1186/s10086-020-01940-w |
work_keys_str_mv |
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