不同冻结条件下辽西风积砂土动力参数试验研究
张向东, 任昆, 刘家顺

Experimental study on dynamic parameters of aeolian sand in western Liaoning Province under different freezing conditions
Xiangdong ZHANG, Kun REN, Jiashun LIU
图6 阻尼比计算方法的比较
Fig.6 Comparison of damping ratios calculated by polygonal area accumulation, improved elliptic area method and elliptic area method