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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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
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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

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Example Embodiment

[0080] Example 1: 15 mixed-species hardwood logs from a wood plant in Madison, Wisconsin, USA

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

[0082] The quality of hardwood logs varies greatly among different tree species, different collection sites, and even different locations on the same tree. Log rot, holes, knots, trauma and other growth defects not only reduce the strength of the wood product but also affect its appearance, thereby reducing the value of the wood and its products; the location, type and size of these defects determine the potential grade and value of the board . Studies have shown that specific information on these internal defects can be increased in value by 10%-21% if effectively utilized during the sawing process. Thus, early detection of internal defects in hardwood logs can provide significant benefits to the timber industry in terms of optimal use of resources.

[0083] To test the...

Example Embodiment

[0123] Example 2: 21 boxwood trees (Liriodendron tulipifera) in the MeadWestVaco forest in the central Appalachian mountains, West Virginia, USA.

[0124] 15 boxwoods are randomly selected and felled. Each tree was sawn into 3-5 commercial length logs for a total of 52 logs. It was observed that the quality grades of these logs vary greatly. Some logs have obvious signs of rot after sawing, some logs have deep external damage, and there are also some high-quality logs. The test experiment is one month after felling, and the time is the beginning of March. The moisture content of the log samples was 45-60%, all above the fiber saturation point (30%).

[0125] In order to obtain the basic physical parameters of the logs, high-resolution 3D laser scanning of the logs was first performed. The scanning is carried out along the length of the log, and the sampling step is 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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