Nondestructive measurement of cross- sectional shape of a tree trunk
Nondestructive measurement of cross- sectional shape of a tree trunk
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树干横截面形状的无损测量
DOI：
10.1007/s10086-011-1174-1
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
T
中科院分区：
文献类型：
--
作者：
Koizumi;A.; Ikeda;K.; Sawata;K.; Hirai;T
为了评价树干的抗风蚀能力，提出了一种确定树干横截面形状的非破坏性方法。在该方法中，通过测量树干周长上的多个测量点之间的距离来计算它们之间的坐标。测量点之间的形状是使用放置在它们之间的轮廓测量器生成的。使用长度为300和900 mm的轮廓规对具有四种形状图案和四种不同直径的模型试样进行测量测试。通过比较为生成的图像和照片计算的截面模量来验证估计的准确性。所有试件的截面模量（生成/照片）的平均比值为0.994，这表明所提出的方法是高度准确的。在保证树干直径26%无偏斜钻孔的条件下，利用剖面法和抗钻技术可以计算出空心树干的截面模量。
To evaluate windthrow resistance with respect to stem breakage, a nondestructive method for determining the shape of trunk cross sections was developed. In this method, the coordinates of multiple gauge points set on the perimeter of a trunk are calculated by measuring the distances between them. The shape between the gauge points is generated with the use of a profile gauge placed between them. Measurement tests were conducted using profile gauges with lengths of 300 and 900 mm on model specimens with four shape patterns and four different diameters. The accuracy of the estimation was verified by comparing the section modulus calculated for the generated image and for the photograph. The average ratio of section modulus (generated/photo) for all specimens was 0.994, which indicates that the proposed method is highly accurate. The section moduli of hollow trunks can be evaluated using the profile method together with the drill resistance technique on the condition that 26% of the trunk diameter could be drilled without skew.