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中文摘要：
采用超声导波法对海底管道进行健康监测和缺陷检测,需要研究导波在深水环境下的海底管道结构中的传播特性。该文采用全局矩阵法计算纵向导波在水下带粘弹性层输油管道中的传播位移和应力,得到频散曲线和个别模态（如α模态与L（0,4）模态）的波结构。通过对纵向导波频散曲线和波结构的详细分析,阐述了纵向导波在水下带粘弹性层输油管道中的传播规律。这既有益于加深对导波在深水环境下的海底管道结构中传播机理的理解,也可为设计采用纵向导波进行海底输油管道损伤检测系统提供技术支撑。
英文摘要：
It is essential to understand how the guided waves travel in benthal pipes in order to monitor/inspect their health statues.In this paper,the propagation characteristics of longitudinal guided waves in oil-filled and with viscoelastic coating pipes under water loading have been investigated by a global matrix method.The displacement and stress distribution in pipes have been numerically calculated.The dispersion curves and wave structure such as α mode and L（0,4） mode have been presented,through which the propagation mechanism for the longitudinal guided wave traveling in the pipe is demonstrated.The result can be used to support the design and implementation of damage detection schemes for pipe-like structures.
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