中文摘要：

采用严格的界面电学边界条件导出了显式形式的频散关系，并对PZT-5H压电陶瓷进行了数值计算．计算结果表明：衰减随着液体的黏性系数、液体密度和波的频率的增加而增大；当液体的介电常数较大时，穿透深度变小，衰减变大．

英文摘要：

The explicit dispersion relation was derived by adopting the exact electric boundary conditions at the interface. Numerical calculations were conducted for PZT-5H piezoelectric ceramic. The numerical results show that the attenuation increases with the increase of viscosity and density of the liquid, and wave frequency as well. When the dielectric constant of the liquid is relatively large compared to that of the piezoelectric material, the penetration depth becomes smaller and attenuation increases.