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本文以广西东门林场的人工林尾叶桉(Eucalyptusurophylla),尾巨桉(EucalyptusurophyllaE.grandis),尾园桉(E.urophyllaE.tereticornis),尾赤桉(E.urophyllaE.camaldulensis)和大花序桉(E.cloeziana)木材为主要材料,用驻波管法测试了五种桉树木材的吸声系数,比较了这些桉树木材的吸声性能,结果显示五种桉树木材的吸声系数在频率1000赫兹之内变化不大,之后随频率的增加吸声系数也在增加。在频率200至2000赫兹范围内,五种桉树木材的吸声系数差异不显著,在低频区域,尾叶桉的吸声性能较好。在所测试的声波频率范围内,桉木弦锯板的吸声系数高于径锯板;0.5厘米厚的锯材的吸声性能好于1.0厘米厚的锯材;因此,桉木板材的种类和板材的厚度影响其吸声性能,但五种桉树木材的吸声性能差异不显著。图2表4参6。
In this paper, Eucalyptus urophylla, Eucalyptus urophylla E.grandis, E.urophylla E.tereticornis, E.urophylla E.camaldulensis and E. grandis eucalyptus (E.cloeziana) wood as the main material, using the standing wave tube method to test the sound absorption coefficient of five kinds of eucalyptus wood, sound absorption performance of these eucalyptus wood, the results showed that the sound absorption coefficient of five kinds of eucalyptus wood at a frequency of 1000 hertz Within little change, then increase the frequency with the sound absorption coefficient is also increasing. There was no significant difference in sound absorption coefficient between the five species of eucalyptus wood in the frequency range of 200 to 2000 hertz. In low frequency region, the sound absorption performance of Eucalyptus urophylla was better. The sound absorption coefficient of the eucalyptus chord saw plate was higher than that of the radial saw blade over the range of sonic frequencies tested; the 0.5 cm thick sawnick had better sound absorption than the 1.0 cm thick sawnace; therefore, the species of eucalyptus wood And the thickness of the board affect its sound absorption performance, but the sound absorption performance of five kinds of eucalyptus wood is not significant difference. Figure 2 Table 4 参 6.