【摘要】 推导出了非均质材料的共振频率理论解析式,理论分析并用实验验证了木材长度方向的自由水梯度对纵向振动共振频率产生的影响,得出了影响程度由大到小依次为1次振动模式、2次振动模式和3次振动模式的结果。另外,原木在堆放6～7个月后,尽管平均含水率在90%～100%,但纵向振动弹性模量测定值与生材时相比增加了10%左右,其原因就是受长度方向的自由水梯度的影响。图9参8更多还原

【Abstract】 The longitudinal vibration model for wooden heterogeneous material was built in his paper,which was wood for analyzing the effects of free water gradient on longitudinal vibration frequency in its longitudinal direction.The results form experiments showed that this extents were ordered as fundamental,2nd,and 3rd vibration modes.In addition,the measurement value of elasticity modulus after log storing 6 to 7 months was increased as 10% as that of fresh log,which reason was from free water gradient.更多还原