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首页> 外文期刊>IAWA Journal >Frequencies in vibrating wood - Does cell organization matter?
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Frequencies in vibrating wood - Does cell organization matter?

机译：振动木材的频率 - 细胞组织物质吗？

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摘要

The relationship between the spatial organization of different cell types, of the xylem rays, and of the tree rings and the frequencies in vibrating softwoods and hardwoods was studied under controlled conditions. In total, the frequencies in 1007 standardized vibrating plates from 16 softwoods and 74 hardwoods were analysed using high resolution laser sensors (accuracy +/- 0.02 mu m, sampling frequency 30 kHz) for vibration measurements. Overlapping frequencies within the frequency spectra were identified by means of Fast Fourier Transformation analysis. With regard to the number of distinct frequencies within the spectra, four different vibration types were identified: type 1 -one dominant frequency within the frequency spectra; type 2-two dominant frequencies within the frequency spectra; type 3 - three dominant frequencies within the frequency spectra; type 4-no dominant frequencies within the frequency spectra. The presence of distinct frequencies was correlated with a highly organized spatial arrangement of tracheids in softwoods, with a storied arrangement of the xylem rays in hardwoods, and with low variation in tree-ring width in both softwoods and hardwoods. The grid size for repetition in these xylem structures influenced the frequencies of the vibrating wood in absolute numbers. The results indicate that the analysis of the anatomical structure of the wood can contribute to the grading of timber for its vibration characteristics, which is of special interest for the selection of resonance wood for musical instruments.
机译：在受控条件下，研究了在受控条件下研究了不同细胞类型的空间组织的关系，Xylem射线和树圈和振动软木和硬木中的频率。使用高分辨率激光传感器（精度+/- 0.02 mu m，采样频率30 kHz）分析了来自16个软木和74个硬木的1007个标准化振动板中的频率，用于振动测量。通过快速傅里叶变换分析识别频谱内的重叠频率。关于光谱内的不同频率的数量，识别出四种不同的振动类型：频率谱内的1型频率;频谱内的2-两个主导频率;在频谱内键入3 - 三个主导频率;在频谱内键入4-NO主导频率。不同频率的存在与软木中的气管内的高度有组织的空间排列相关，在软木和软木和硬木中，木质射线的综合射线的故障排列，并且在软木和硬木中具有较低的树木宽度。在这些木耳结构中重复的网格尺寸影响了绝对数量的振动木材的频率。结果表明，木材的解剖结构分析可以有助于木材的振动特性的分级，这对于选择乐器的共振木材是特别的兴趣。

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