Abstract—

Speeds of surface elastic wave propagation over the human chest along and across the ribs are found. Ten healthy male volunteers have participated in the experiment. Vibrations of a striker-vibrator and a light accelerometer in contact with the chest have been detected using a specially designed hardware and software complex. The transfer function phase for passage of elastic waves over the chest is calculated. Wave propagation speeds are found using the phase method (frequency dependence of the transfer function phase). Differences between the speeds along and across the ribs are found in the frequency ranges from 27 to 100 Hz and from 100 to 200 Hz with the maximal-to-minimal speed ratio of 1.8. It is shown that one of the causes for the differences between the speeds can be different local elasticity and viscosity of the chest tissues.

中文翻译：

---

人体表面弹性波的传播速度

摘要—

发现了表面弹性波沿着肋骨穿过肋骨并跨过肋骨传播的速度。十名健康的男性志愿者参加了该实验。使用专门设计的硬件和软件组合，可以检测到撞针振动器和与胸部接触的光加速度计的振动。计算出使弹性波通过胸部的传递函数相位。使用相位法（传递函数相位的频率依赖性）可以找到电波的传播速度。沿着肋和穿过肋的速度之间的差异在27至100 Hz和100至200 Hz的频率范围内发现，最大与最小速度之比为1.8。结果表明，速度差异的原因之一可能是胸部组织的局部弹性和粘度不同。