中文摘要：

纳米力学方法适用于具有离散特性的材料．利用纳米力学方法，得出声波在多层皮肤组织中的波动方程．分别改变黑素瘤皮肤的泊松比、黑素瘤侵袭厚度（Breslow深度）、节间距离，计算多层皮肤结构模型对垂直入射纵声波的反射系数．同时计算了声速和声衰减系数随组织参数的变化．计算结果表明，可综合利用一定频率段内反射系数最小点数、声速和衰减系数的变化来表征正常皮肤和病变皮肤．

英文摘要：

Doublet mechanics （DM） is applied to materials with dispersing property. The wave equation in multi-layered skin tissue is obtained through the method of DM in this article. By changing the Poisson ratio in melanoma skin tissue, the growth and spread of melanoma （Breslow thickness）, the internode distance, the reflection coefficients of the longitudinal waves incident vertically in the multi-layered skin model are calculated. And the acoustic velocity and acoustic attenuation coefficient changing with tissue parameters are also calculated. The results show that we can synthesize the change of the number of the minimal reflection coefficient, acoustic velocity and attenuation coefficient to discriminate cancerous skin from normal skin within a certain frequency.