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Broad-leaved wood log internal quality assessment system and application thereof

An evaluation system and internal quality technology, applied in the evaluation system field, can solve the problems of limited acoustic parameters and accuracy gap in quality evaluation, and achieve the effect of alleviating the contradiction between supply and demand, protecting the ecological environment, and promoting economic development

Active Publication Date: 2019-05-10
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In 2005, Lin Wenshu et al. used ultrasonic waves and stress waves to test the Korean pine specimens respectively, and analyzed the influence of wood density, hole size and quantity on the dynamic elastic modulus obtained by the two detection methods, and found that the two detection methods have different effects on different defects. degree of wood, there is a gap in its accuracy
[0009] Due to the diversity of defect types in logs and the non-stationarity of detection signals, effective quality assessment acoustic parameters are very limited, and most of the assessment parameters, including sound velocity, transit time and attenuation, come from independent frequency domain or time domain analysis. These methods provide only limited internal quality information

Method used

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  • Broad-leaved wood log internal quality assessment system and application thereof
  • Broad-leaved wood log internal quality assessment system and application thereof
  • Broad-leaved wood log internal quality assessment system and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0080] Example 1: 15 logs of mixed species broad-leaved wood from a timber factory in Madison, Wisconsin, U.S.

[0081] The log internal quality evaluation system of the present invention is mainly aimed at hardwood logs.

[0082] Hardwood log quality varies widely between species, collection locations, and even locations within the same tree. Log rot, holes, knots, trauma and other growth defects reduce the value of the lumber and its products by reducing not only its strength but also its visual quality; the location, type and size of these defects determine the potential grade and value of the lumber . Studies have shown that if the specific information of these internal defects can be effectively used in the sawing process, its value can be increased by 10%-21%. Early detection of internal defects in hardwood logs can thus bring significant benefits to the timber industry in terms of optimal utilization of the resource.

[0083] To test the effectiveness of the system o...

Embodiment 2

[0123] Example 2: 21 boxwood trees (Liriodendron tulipifera) from the MeadWestVaco Forest in the Central Appalachian Mountains of West Virginia, USA.

[0124] Randomly select 15 boxwood trees and cut them down. Each tree was sawn into 3-5 commercial length logs for a total of 52 logs. Observation found that the quality grades of these logs were quite different. Some logs had obvious signs of decay after sawing, some logs had deep external damage, and there were also some high-quality logs. The test experiment was one month after felling, at the beginning of March. The log samples had a moisture content of 45-60%, all above the fiber saturation point (30%).

[0125] In order to obtain the basic physical parameters of the logs, a high-resolution 3D laser scan of the logs was first performed. Scanning is carried out along the length of the log, with a sampling step of 1.59mm. According to the difference in the circumference of the log, the number of pixels per week is 250-450 ...

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Abstract

The invention discloses a broad-leaved wood log internal quality assessment system, which obtains response signals by mainly performing an acoustic impact test on the log, and then analyzes the response signal to evaluate the health status inside the log. The specific scheme is that: using the acoustic impact test as a non-destructive assessment method to test defects such as decay and voids in the log; obtaining response signals through the acoustic impact test on the log; and then analyzing the response signals to assess the health status inside the log; which meets actual use requirements.

Description

technical field [0001] The invention relates to a hardwood log internal quality evaluation system and its application, belonging to the technical field of evaluation systems. Background technique [0002] The results of the eighth national forest resources inventory show that my country's forest resources are showing a good trend of continuous increase in quantity, steady improvement in quality, and continuous enhancement in efficiency. my country's forest coverage rate is 21.63%, and its total stock volume is 15.137 billion cubic meters, accounting for 2.5% of the world's total forest stock volume. Nevertheless, my country is still a country with very scarce forest resources and fragile ecology in the world. The forest coverage rate is far lower than the global average level of 31%. It is only 1 / 7 of the world's average per capita forest volume, making it one of the countries with the lowest per capita forest stock in the world. [0003] At present, my country's forest res...

Claims

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Application Information

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IPC IPC(8): G01N29/04G01N29/07
Inventor 徐锋刘云飞瞿玉莹杨扬
Owner NANJING FORESTRY UNIV
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