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首页> 外文会议>International Symposium on Nondestructive Testing of Wood; 20000913-20000915; Sopron; HU >Machine Grading of Structural Sawn Timber from various Softwood and Hardwood Species
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Machine Grading of Structural Sawn Timber from various Softwood and Hardwood Species

机译：各种软木和硬木物种的结构锯材的机械分级

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摘要

The effectiveness of different grading systems for structural timber of various species was compared in this study. More than 1,330 beams of the softwood species Picea abies, Pinus sylvestris, Larix decidua and Pseudotsuga menziesii as well as the hardwood species Quercus robur and Fagus sylvatica were machine strength graded by bending, X-ray, stress wave and ultrasonic systems. Additionally this study investigated to which extent grading accuracy can be improved by combining different grading systems. All samples were also graded visually according to the German standard DIN 4074. The study shows that all machine grading systems are more efficient than the time-consuming visual grading under laboratory conditions. For ultrasonic and stress wave systems improvements for the softwood species were achieved through additional density measurements by an X-ray system. Moreover an additional inclusion of data on knots increases the accuracy of all grading systems.
机译：在这项研究中，比较了不同等级系统对各种树种的有效性。通过弯曲，X射线，应力波和超声系统对超过1,330束软木树种的云杉，樟子松，落叶松和落叶松，以及硬木树种的栎木和圆柏进行了机械强度分级。此外，本研究调查了通过组合不同的分级系统可以将分级精度提高到何种程度。还根据德国标准DIN 4074对所有样品进行了视觉分级。研究表明，与实验室条件下费时的视觉分级相比，所有机器分级系统都效率更高。对于超声波和应力波系统，通过X射线系统进行的附加密度测量可实现对软木树种的改进。此外，在节上附加包含数据可提高所有分级系统的准确性。

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