이팝나무 잎의 구성조건에 따른 흡음재의 흡음특성
Sound Absorption Properties by the Leaf Composition for Chionanthus Retusa
0
조회
0
다운로드
1
인용
0
참고문헌
키워드
초록
본 연구는 낙엽활엽수종인 이팝나무(Chionanthus retusa) 잎의 흡음 성능을 평가하고자 하였다. 잎을 주재료로 하여 재료의 크기와 두께 및건조 조건을 달리해 흡음재를 제조하였다. 중간형 측정관(100㎐-3200㎐)을 적용한 관내법(Impedance tube method)을 이용하여 흡음율을 측정하였다. 총 18개의 조건에서 측정된 흡음율을 분석하였다. 기건엽 조건(MC 13.92%)과 생엽 조건(MC 162.04%)의 흡음율은 두께가 증가함에 따라크게 향상되었다. 흡음율은 밀도의 증가에 비례하는데, 부피당 밀도가 더 높은 생엽조건의 두께별 흡음율이 더 높게 나타났다. 생엽 조건군에서크기 0.5 × 0.5㎠의 2.50㎝ 두께에서 평균 흡음율은 0.643으로 가장 높게 나타났으며, 각 시험처리 조건별 흡음재의 주파수 대역별 흡음율은기건엽 조건의 두께 1.75㎝에서 가장 높게 나타났다. 이상의 연구결과로부터 전반적인 흡음율은 1000㎐ 이상의 대역에서 더 높은 성능을 보였다.
Abstract
This study attempted to evaluate the sound absorption performance of leaves of Chionanthus retusa, a deciduous broad-leaved treespecies (DBLT) in Korea. The sound-absorbing material was molded by varying the size of the leaf specimen, the thickness of theleaf layer, and the drying conditions using the leaf as the test material. The sound absorption coefficients (SACs) was measured usingthe impedance tube method applied with an intermediate measuring tube (100㎐-3200㎐). The SACs measured under a total of 18 conditionswere analyzed. The SAC of the air-dried leaves condition (MC 13.92%) and the fresh leaf condition (MC 162.04%) improved significantlyas the thickness increased. The SAC was proportional to the increase in density, and in particular, the SAC was higher by the thicknessof the fresh leaf under the condition of high density per volume. In the fresh leaf condition group, the average SAC value of 0.643was observed for 0.5 × 0.5 ㎠ leaf size conditions with a leaf layer thickness of 2.50 ㎝. The maximum SAC value by wavelengthwas observed under the condition of a leaf layer thickness 1.75 ㎝. From the above results, the overall SAC showed higher performancein the wavelength band of 1,000㎐ or higher.
참고문헌 (17)
- Azma P, "Sound absorption of extracted pine-apple fibers", Applied Acoustics, 136, pp.9~15 (2018)
- 변희섭, "Sound Absorption Property of Heat-Treated Wood at a Low Temperature and Vacuum conditions", 목재공학, 38(2), pp.101~107 (2010), 한국목재공학회
- Masataka Hakamada, "Sound absorption characteristics of porous aluminum fabricated by spacer method", Journal of Applied Physics, 100(11), pp.114908~ (2006), AIP Publishing[DOI]
- Hoda SS, "Factors influencing acoustic performance of sound absorptive materials", Aust. J. Basic. Appl. Sci, 3, pp.4610~4617 (2009)
- Hwang KH, "Sound absorption characteristic of resonator by hole position and wood species", J. of the Korean Wood Science and Technology, 36, pp.9~16 (2008)
- Apri Heri Iswanto, "The Physical, Mechanical, and Sound Absorption Properties of Sandwich Particleboard (SPb)", 목재공학, 48(1), pp.32~40 (2020), 한국목재공학회
- 정수영, "Comparison of Sound Absorption Performance between Fresh and Air-dried Leaves by Leaf Composition in Quercus glauca", 한국환경과학회지, 32(1), pp.25~35 (2023), 한국환경과학회[DOI]
- 정수영, "Effects of Air-Dried Leaves of Evergreen Broad-Leaved Trees on Sound Absorption Property", 목재공학, 49(5), pp.482~490 (2021), 한국목재공학회
- 정수영, "Sound Absorption Property of the Leaves of Two Evergreen Broad-Leaved Tree Species, Dendropanax morbiferus and Fatsia japonica", 목재공학, 48(5), pp.631~640 (2020), 한국목재공학회
- Kang CW, "Improvement of sound absorption capability of wood and wood-based board by resonant absorption", J. Korean Wood Sci. Technol, 29, pp.16~21 (2001)
- 강춘원, "버섯폐골목의 흡음성능과 구조적 특징", 목재공학, 36(1), pp.54~60 (2008), 한국목재공학회
- 강춘원, "Sound Absorption Coefficient and Sound Transmission Loss of Rice Hull Mat", 목재공학, 47(3), pp.290~298 (2019), 한국목재공학회[DOI]
- Koizumi T, "The development of sound absorbing materials using natural bamboo fibers", WIT Transactions on The Built Environment, 59 (2002)
- Lee JM, "A study on the acoustic absorbent characteristics of recycled materials", Master, pp.2001
- McGrory M, "Sound absorption coefficient measurement: Re-examining the relationship between impedance tube and reverberant room methods", Proceeding of Acoustics 2012, pp.1~8 (2012), Australian Acoustical Society
- Nor MJM, "A preliminary study of sound absorption using multi-layer coconut coir fibers", Electronic J. Technical Acoustics, 3, pp.1~8 (2004)
- 원경록, "Sound Absorption Property of Carbonized Medium Density Fiberboards at Different Carbonizing Temperatures", 목재공학, 43(2), pp.206~213 (2015), 한국목재공학회[DOI]