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Nondestructive testing method of wood moisture content based on a planar capacitance sensor model

Forestry Studies in China 2010年第3期12卷 142-146页

作者： WANG Jue LUO Yue-sheng LIU Shao-gang College of Science Harbin Engineering University Harbin 150001 P. R. China College of Automation Harbin Engineering University Harbin 150001 P. R. China College of Mechanical and Electrical Engineering Harbin Engineering University Harbin 150001 P. R. China

For our research, a new hybrid experimental-computational method is presented. We applied a least squares fitting method （LSFM） to reconstruct the wood moisture content （WMC） from the data measured with a planar capacitance sensor. A boundary element method （BEM） was used to compute the relationship between capacitance and the dielectric constant. A functional relationship between MC and the dielectric constant was identified by LSFM. The agreement of this final computation result with the experimental data indicates that this method can be used to estimate the WMC quickly and effectively with engineering analysis. Compared with popular statistical methods, a large number of experiments are avoided, some costs of testing are reduced and the efficiency of testing is enhanced.

关键词： planar capacitance sensor nondestructive testing wood moisture content boundary element method least squares fitring method

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Mechanical behaviour of wood compressed in radial direction:Part II.Influence of temperature and moisture content

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Journal of Bioresources and Bioproducts 2020年第4期5卷 266-275页

作者： Chen Huang Yinghei Chui Meng Gong Felisa Chana wood Science&Technology Centre University of New BrunswickFrederictonNBCanada E3C 2G6Canada Department of Civil&Environmental Engineering University of AlbertaEdmontonABCanada T6G 1H9Canada Faculty of Forestry&Environmental Management University of New BrunswickFrederictonNBCanada E3B 5A3Canada

This study investigated the influence of pressing temperature and moisture content on the me-chanical properties of wood compressed in radial direction.Jack pine(Pinus banksiana)and bal-sam poplar(Populus balsamifera)specimens were tested under a combination of pressing temper-ature(20℃,55℃,90℃,and 125℃)and wood moisture content(2%,7%,12%,and 17%).The yield stress(_(δ)y)and modulus of elasticity(MOE)of the specimens were determined from the stress-strain response.It was found that an increase in either pressing temperature or moisture content of wood generally caused a decrease in the mechanical properties for both species.The t-test results revealed that jack pine specimens are more sensitive to changes in pressing tem-perature and wood moisture content than balsam poplar.For jack pine specimens,at any of the pressing temperatures,the moisture content of 12%was found to be a crucial level to start a significant decrease in𝜎y and MOE,while at any of the moisture content,a change in temper-ature from 55℃to 90℃exhibited a significant change in𝜎y and MOE.The regression models developed can be used to predict𝜎y and MOE as a function of temperature and moisture content.

关键词： Compression in radial direction Yield stress Modulus of elasticity Pressing temperature wood moisture content Stress-strain curve

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