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首页> 外文期刊>Wood Science and Technology >Study of acoustic emission propagation characteristics and energy attenuation of surface transverse wave and internal longitudinal wave of wood
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Study of acoustic emission propagation characteristics and energy attenuation of surface transverse wave and internal longitudinal wave of wood

机译：木材发射传播特性及木材横波和内部纵波能量衰减的研究

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摘要

To study the propagation characteristics and energy attenuation of different modal acoustic emission signals in wood, Zelkova schneideriana and Pinus sylvestris var.mongolica were used as test materials, and a test scheme was designed to separate surface transverse wave and internal longitudinal wave based on wave theory. The propagation characteristics of AE signal along the grain direction of wood was studied based on the discrete wavelet analysis, and then the energy attenuation model of AE signal was developed. The results show that when STW and ILW were propagated in wood, the energy of AE signal shows exponential decay with the propagation distance. STW has a more complex frequency domain distribution and more drastic time-frequency attenuation, and the propagation velocity of STW in Zelkova schneideriana and Pinus sylvestris var.mongolica was 1519.8 m(.)s(-1) and 1118.8 m(.)s(-1), respectively. The AE mode of ILW was relatively stable and always distributed in the low frequency band with fast propagation; the propagation velocity in Zelkova schneideriana and Pinus sylvestris var.mongolica was 6944.4 m(.)s(-1) and 5168.4 m(.)s(-1), respectively. Furthermore, the study shows that the propagation velocity of ILW is about 4.6 times that of STW in the same species of wood.
机译：为研究木材中不同模态声发射信号的传播特性和能量衰减，Zelkova Schneideriana和Pinus Sylvestris var.mongolica用作试验材料，并且设计了基于波理论的表面横波和内部纵向的测试方案。基于离散小波分析研究了沿木材的晶粒方向的AE信号的传播特性，然后开发了AE信号的能量衰减模型。结果表明，当STW和ILW在木材中传播时，AE信号的能量显示出具有传播距离的指数衰减。 STW具有更复杂的频域分布和更激烈的时频衰减，并且Zelkova Schneideriana和Pinus Sylvestris var.mongolica的STW传播速度为1519.8M（。）S（。）和1118.8米（。）S（ -1）分别。 ILW的AE模式相对稳定，始终在快速传播中分布在低频带中; Zelkova Schneideriana和Pinus sylvestris var.mongolica的繁殖速度分别为6944.4m（。）（ - 1）和5168.4 m（。）s（-1）。此外，该研究表明，ILW的传播速度是同一种木材中的STW的约4.6倍。

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  • 来源
    《Wood Science and Technology》 |2021年第6期|1619-1637|共19页
  • 作者

    Li Ming; Wang Minghua; Ding Rui; Deng Tingting; Fang Saiyin; Lai Fei; Luoi Ruihan;

  • 作者单位

    Anhui Polytech Univ Sch Elect Engn Wuhu 241000 Anhui Peoples R China|Southwest Forestry Univ Sch Machinery & Transportat Kunming 650224 Yunnan Peoples R China;

    Southwest Forestry Univ Sch Machinery & Transportat Kunming 650224 Yunnan Peoples R China;

    Southwest Forestry Univ Sch Machinery & Transportat Kunming 650224 Yunnan Peoples R China;

    Southwest Forestry Univ Sch Machinery & Transportat Kunming 650224 Yunnan Peoples R China;

    Southwest Forestry Univ Sch Machinery & Transportat Kunming 650224 Yunnan Peoples R China;

    Southwest Forestry Univ Sch Machinery & Transportat Kunming 650224 Yunnan Peoples R China;

    Southwest Forestry Univ Sch Machinery & Transportat Kunming 650224 Yunnan Peoples R China;

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