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为探索利用声超声技术预测落叶松木材密度的可行性,本研究测试了无疵落叶松木材立方体的密度及轴向(L)、径向(R)、弦向(T)三个方向的五个AU参数:波速(V)、峰值电压(A)、均方根电压(RMS)、上升时间(RT)、频率形心(FC)等,研究了AU参数与气干密度(ρ)的相关性。结果表明:上升时间RT在L方向最小,A、RMS、V等3个参数在L方向最大,FC在3个方向的差异不显著,除FC之外其余4个AU参数轴向和径向、轴向和弦向的差异性在0.01水平都显著;AU参数与ρ的相关性在不同方向也存在差异,在轴向和径向V与ρ的相关性均最高,其决定系数R~2分别为0.86和0.84;在弦向,RMS与ρ的相关性最高,R~2=0.46。
In order to explore the feasibility of predicting the density of larch wood using acoustic-acoustic techniques, this study tested the density and the distributions of the densities of Larch wood cubes in three directions of axial (L), radial (R) and chord (T) AU parameters such as wave velocity (V), peak voltage (A), root mean square voltage (RMS), rise time (RT) and frequency centroid (FC) Sex. The results show that the rise time RT is the smallest in the L direction, the three parameters of A, RMS and V are the largest in the L direction, while the differences of the FC in the three directions are not significant. The other 4 AU parameters except FC are axially and radially, The difference between axial and chord directions is significant at 0.01 level. The correlation between AU parameters and ρ is also different in different directions, and the correlation between the axial and radial V and ρ is the highest. The determination coefficients R ~ 2 are 0.86 and 0.84 respectively. In the chordwise direction, the correlation between RMS and ρ is the highest, R ~ 2 = 0.46.