Fig. 1. Schematic of porous medium cylinder in an infinite fluid.无限流体中孔隙介质圆柱的示意图

Fig. 2. The dispersion curves of porous cylinder in infinite fluid.无限流体中孔隙介质圆柱周向导波的相速度频散曲线

Fig. 3. The first sixth order mode of dispersion curves of porous cylinder in infinite fluid.无限流体中孔隙介质圆柱周向导波群速度频散曲线的前6阶模态

Fig. 4. The dispersion curves of circumferential guide waves between an elastic cylinder and a porous cylinder in infinite fluid.无限流体中弹性圆柱和孔隙介质圆柱周向导波的频散曲线对比

Fig. 5. Dispersion curves for different cylinder radius.不同圆柱半径下的导波频散曲线对比

Fig. 6. Dispersion curves versus porosity.不同孔隙度下的导波频散曲线对比

Fig. 7. Attenuation curves of circumferential waves with different porosity.不同孔隙度时周向导波的衰减曲线对比

Fig. 8. Schematic of excitation and detection points of porous medium cylinder in an infinite fluid.无限流体中孔隙介质圆柱的激发与检测点示意图

Fig. 9. Time-domain waveform of radial displacement at different detection points when the porosity is 0.1: (a) Detection point at ; (b) detection point at . 孔隙度为0.1时, 不同检测点处的径向位移时域波形的对比　(a)检测点在 位置; (b)检测点在 位置

Fig. 10. Time-domain waveform of radial displacement of detection point at when the porosity is 0.1, 0.2, 0.3. 孔隙度为0.1,0.2,0.3时, 检测点在 位置处径向位移时域波形的对比