• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Holzforschung >The use of ultrasound velocity and damping for the detection of internal structural defects in standing trees of European beech and Norway spruce
【24h】

The use of ultrasound velocity and damping for the detection of internal structural defects in standing trees of European beech and Norway spruce

机译：利用超声速度和阻尼检测欧洲山毛榉和挪威云杉站立树木的内部结构缺陷

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Field measurements were carried out to assess the feasibility of ultrasound velocity and damping for the non-invasive testing of standing trees. A total of 87 trees of European beech (Fagus sylvatica L.) and 68 trees of Norway spruce (Picea abies Karst.) were measured in the field, felled and assessed individually for the presence of red heartwood or butt rot. The field assessment of these internal structural defects at the stump level (SL) of the trees was compared with the ultrasound measurements recorded at two tree heights [(i.e. at the SL and 0.5 m above the stump level (ASL)] and in several directions, all perpendicular (PP) to the tree stem. Lower ultrasound velocity and higher damping were found in both species with the presence of internal defects in both the radial and tangential directions of the tree stem. The diameter at breast height (DBH) had a varying effect on both ultrasound velocity and damping. A binary logistic regression was used to test the potential of ultrasound velocity and damping to predict the presence of internal defects. Both the approaches offer similar levels of prediction accuracy (0.72 and 0.76 in beech, and 0.83 and 0.82 in spruce). Due to the significant reduction in measuring time when using ultrasound damping only, this principle is recommended for the detection of red heartwood in beech trees and butt rot in spruce trees.
机译：进行了现场测量，以评估超声波速度和阻尼在站立树木的非侵入式测试中的可行性。在田间共测量了欧洲山毛榉（Fagus sylvatica L.）的87棵树和挪威云杉（Picea abies Karst。）的68棵树，砍伐并分别评估了红色心材或对接腐烂的存在。将树木的树桩水平（SL）处的这些内部结构缺陷的现场评估与在两个树高处（即SL和树桩水平（ASL）上方0.5 m处）记录的超声测量结果进行了比较，都垂直于树茎（PP），在这两个物种中都发现较低的超声波速度和较高的阻尼，并且在树茎的径向和切向都存在内部缺陷，胸高直径（DBH）具有对超声速度和阻尼的影响各不相同。使用二元逻辑回归分析来测试超声速度和阻尼的潜力，以预测内部缺陷的存在。这两种方法都提供了相似的预测精度水平（在山毛榉中为0.72和0.76，在0.83中为0.83）。云杉和0.82（云杉）。由于仅使用超声阻尼时可大大减少测量时间，因此建议将该原理用于检测山毛榉树和屁股中的红色心材。在云杉中腐烂。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号