Sound absorption property of wood for five eucalypt species

Abstract

The sound absorption coefficients of wood and wood boards for five eucalypt species (Eucalyptus urophylla, Eucalyptus urophylla x E. grandis, Eucalyptus urophylla x E. tereticornis, Eucalyptus urophylla x E. camaldulensis and Eucalyptus cloeziana) that were collected from plantation in Dongmen Forestry Center of Guangxi Province, China were tested with standing wave method and their sound absorption properties were also compared. The results showed that the sound absorption coefficients of the five eucalypt wood species did not change evidently below 1000 Hz, but above 1000 Hz their sound absorption coefficients increased with the increasing frequency. The difference in sound absorption coefficient among five species of eucalypt wood is not evident at the tested frequency range (200–2000 Hz), but the sound absorption property ofEucalyptus urophylla at low frequency is better than that of other four species. The sound absorption coefficient of the tangential-sawn board is higher than that of the radial-sawn board. The sound absorption property of eucalypt wood of 0.5 cm in thickness is much better than that of 1.0 cm in thickness. It is concluded that wood sound absorption properties of eucalypts are affected by their board thickness and the type of sawn timber within the testing frequency, but the variance of wood sound absorption property among the five tested species is not significant.

Keywords

Wood / Standing wave method / Sound absorption coefficient / Eucalypt plantation

References

[1] Bucur, V., Clément A., Bitsch, M.et al. 1999. Acoustic properties of resonance wood and distribution of inorganic components of the cell wall [M]. Holz als Roh-und Werkstoff, p103–104.

[2] Dayou Ma. Acoustic science manual [M]. 1983, Beijing: Science Press, 470 477 (in Chinese)

[3] Obataya E., Umezawa T., Nakatsubo F., et al. The effects of water soluble extractives on the acoustic properties of reed (Arundo donax L.) [J]. Holzforschung, 1999, 53(1): 63-67.

[4] Shang-Tzen Chang, Hui-Ting Chang, Yan-San Huang, et al. Effects of chemical modification reagents on acoustic properties of wood [J]. Holzforschung, 2000, 54(6): 669-675.

[5] Shen Jun, Yixing Liu, Tian Zhanli, et al. Relationship between Picea genera wood density and sound characteristic parameters [J]. Journal of Huazhong Agricultural University, 2001, 20(2): 181-184. (inChinese)

[6] Watanabe Haruto, Zhang Qinli, Zhang Qisheng Zhang Binyuan translation Utilization basis for wood [M]. 1986, Shanghai: Shanghai Science and Technology Press, 275 279 (in Chinese)