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The amount of lumber graded by machine stress rating (MSR) has continued to increase since the development of the technology in the early 1960s. Accuracy of lumber strength estimation by X-ray method is reported to be equal to that of MSR. This study examined whether lumber specific gravity and strength can be accurately estimated with radio frequency waves if the moisture content influence in a signal passed through the lumber thickness can be eliminated. Strength of a radio frequency signal passed through the lumber thickness was measured at 6.35 mm intervals along the length of lumber central axis. A linear regression predictive equation was estimated relating modulus of rupture (MOR) to measured signal voltage. Correction for the influence of moisture content on MOR resulted in a predictive equation with an R-2 of 0.59. Validation results based on the developed equation gave an R-2 of 0.67. The results indicate potential for accurate radio frequency estimation of MOR if adequate correction for moisture content influence is performed.
参考答案:数额由机械应力等级木材等级(海洋科学研究)继续增加科技开发自 在六十年代初. 准确估算木材强度X射线法申报为平等的,海洋科学研究. 本研究木材比重和强度是否能准确地估计,如果以无线电波频率的水分 内容影响力的一个信号,通过木材厚度可排除. 无线电频率信号强度过木材厚度在6.35毫米测量重播沿线 腰中轴. 线性回归预测方程估计与断裂模(铁道部)测量信号电压. 校正影响水分就导致了铁道部的预测方程的R20.59. 评审结果的基础上,制定了一个方程式的R20.67. 结果表明射频潜力精确估算,如果铁道部充足水分校正影响演出.