海底载流管道轴对称波频散特性分析

海底载流管道是典型的土-固-液三相耦合问题.利用Flügge壳体运动方程,结合弹性动力学方程,建立海底载流管道轴对称运动时的频散方程,分析自由振动波的性质及其随频率变化的规律.结果表明管道周围的土壤介质对其自由振动波的传播特性影响显著,而土壤介质刚度的增大使得自由振动波的截止频率随之增加.

Dispersion of axisymmetric wave in seabed fluid-filled pipes

Detection of water leaks in seabed fluid-filled pipes using acoustics methods is of significance in engineering. But for the sake of effective detection, the dispersion characteristics of waves in pipes must be known. The seabed fluid-filled pipes are representative of the soilstructure-fluid coupling system. The dispersion equation of seabed fluid-filled pipes under axisymmetric motion is derived from shell motion equation with Fliigge equations for a thin-walled shell and elastic dynamic equation. The free vibration waves changing with non-dimension frequency is analyzed. The result shows that the soil of surrounding cylindrical shells has great effects on the free vibration waves, and thai the cut-off frequency of the free vibration wave increases with the increase of the rigidity of the soil.