【摘要】 本文利用主成分分析方法,对中国主要树种木材的物理力学性能进行了综合分析。结果表明,木材物理力学性能的第1主成分为强度指标,第2主成分为干缩指标,这两个主成分的累计贡献率为84.3％。另外,按第1、2主成分的样本排序图,可将所研究的木材分为WL 11—WL 56十七个等级,从每个等级的编号就可了解到某种木材的强度及干缩性能。更多还原

【Abstract】 The physical and mechanical properties of wood of main species in China are analysed synthetically using the method of principal componeut analysis. The results show that the first principal component is strength index and the second principal component is air shrinkage index, the accumulated contribution ratio of the two principal components is 84.3%. we divide the wood into 17 grades base on the sample order figure. According to the number of the grade in the figure, the strength and air shrinkage of each wood can be obtained easily.更多还原