목재(木材)의 흡음(吸音)과 음향(音響)임피이던스에 미치는 함수율(含水率)의 영향(影響)

Effect of Moisture Content on Acoustic Absorption and Impedance of Wood

The effect of moisture content on acoustic absorption coefficient and impedance of the woods of Pinus densiflora, Chamaecyparis pisifela, Cryptomeria japonica, Abies koreana, Melia azedarch var. japonica, Shorea bracteolata and Shorea acuminata was investigated by standing wave method. The results obtained are summarized as follows: The acoustic absorption coefficient increased with increasing moisture content, but acoustic impedance decreased with increasing moisture content.