流体饱和多孔媒质极中漏Lamb波  

Leaky Lamb waves in a fluid-saturated porous plate

作　　者：周宇峰[1] 王耀俊[1] 马力[2] 高天赋[2] 

机构地区：[1]南京大学声学研究所和近代声学国家重点实验室,南京210093 [2]中国科学院声学研究所,北京100080

出　　处：《声学学报》1998年第6期490-496,共7页Acta Acustica

摘　　要：从Biot理论出发导出了外界有流体负载时多孔媒质板中漏Lamb波的特征方程，具体计算了水馆和玻璃融珠板中漏Lamb波的传播速度随频率的变化以及多孔板表面流阴抗对两个最低阶漏Lamb波速度和衰减的影响．采用超声透射谱实验技术，测量了浸没于水中的玻璃融珠板在开孔状态下一定频率范围内的色散关系．理论和实验符合得较好．The characteristic equations for leaky Lamb waves in fluid-saturated porous plates with loading liquid are derived in this paper by using the Biot's theory. A mathematical algorithm is developed for estimating the propagation velocity of leaky Lamb waves in a plate of cemented glass beads with open and sealed boundaries. The effect of surface flow impedance of the porous plate on propagation velocity and amplitude attenuation of the two lowest modes is evaluated.By using a broad-band ultrasonic transmission spectrups measuremellt technique, the dispersion relations of leaky Lamb waves at certain frequency region are measured. The predicted and experimental results are found to be in good agreement.

关 键 词：特征方程 多孔媒质板 流体负载 L-波 漏L波 

分 类 号：O422[理学—声学]