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    张厚江, 王喜平, 苏娟, RobertJRoss. 应力波在美国红松立木中传播机理的试验研究[J]. 北京林业大学学报, 2010, 32(2): 145-148.
    引用本文: 张厚江, 王喜平, 苏娟, RobertJRoss. 应力波在美国红松立木中传播机理的试验研究[J]. 北京林业大学学报, 2010, 32(2): 145-148.
    ZHANG Hou-jiang, WANG Xi-ping, SU Juan, Robert J Ross. Investigation of stress wave propagation mechanism in American red pine trees.[J]. Journal of Beijing Forestry University, 2010, 32(2): 145-148.
    Citation: ZHANG Hou-jiang, WANG Xi-ping, SU Juan, Robert J Ross. Investigation of stress wave propagation mechanism in American red pine trees.[J]. Journal of Beijing Forestry University, 2010, 32(2): 145-148.

    应力波在美国红松立木中传播机理的试验研究

    Investigation of stress wave propagation mechanism in American red pine trees.

    • 摘要: 为了解应力波在立木中的传播机理,本试验用3根新砍伐的美国红松原木来模拟立木,用FAKOPP应力波微秒计测量不同横截面上各个网格节点处的应力波到达时间。结果表明:1)在原木中纵截面上,应力波传播时间等值线在开始阶段为倾斜曲线;随着距离的增大,等值线倾斜度逐渐减小,直至最后与原木长度方向近似垂直。2)应力波到达同一个横截面各部位的时间差与传播距离和原木直径有关,传播距离越长,时间差越小;原木直径越小,时间差越小。3)应力波在中纵截面上,原木表层的传播距离与传播时间之间有很好的比例关系。

       

      Abstract: Stress wave technology is quickly becoming one of the main wood quality evaluation tools for plantation trees. However,the mechanism of stress wave propagation on standing trees is not well understood and the research in this area is lacking. In this study,we investigated how stress wave propagate along a standing tree through a series of laboratory experiments. Three freshlycut red pine (Pinus resinosa) logs were used to simulate the standing trees and the timeofflight data were obtained using a stress wave microsecond timer (Fakopp Inc.). It was found that the wave front of the stress waves on the longitudinalradial (L-R) log plane,represented by the timeofflight contour curves,was oblique (relative to the longitudinal axis of a log) in the beginning,with the wave leading along the surface of log. As the travel distance increased,the wave front became less oblique,and eventually became vertical to the longitudinal axis of the log. The difference of timeofflight on a cross section was affected by both the travel distance and log diameter,and the difference of timeofflight was smaller for long travel distance and small log diameter. The results also showed that on the log surface layer along the longitudinal midsection,there was a very good linear relationship between travel distance and the timeofflight. 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