Guided wave propagation in buried and immersed fluid-filled pipes: Application of the semi analytic finite element method
Guided wave propagation in buried and immersed fluid-filled pipes: Application of the semi analytic finite element method
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DOI：
10.1016/j.compstruc.2018.10.020
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发表时间：
2019-02
影响因子：
4.7
通讯作者：
W. Duan;R. Kirby
中科院分区：
文献类型：
--
作者：
W. Duan;R. Kirby
了解导波在多层系统中的传播在无损评估中具有重要的应用。本文提出了一种通用的加权剩余公式导波管道埋在弹性固体中，或沉浸在静止的流体填充的导波传播。一维半解析有限元（SAFE）方法与完全匹配层（PML）相结合，计算不同管道应用的频散曲线。将这种方法的速度和准确性与比例边界有限元法（SBFEM）进行比较，结果表明，对于浸入液体中的杆，这两种方法提供了非常相似的计算速度。的速度和精度的模型，然后调查浸没和埋地充液管道，它表明，当离散化的PML没有优势时，发现在计算速度时，使用二次或更高阶谱元素，提供的自由度的数量在PML是相等的。因此，它示出的SAFE-PML方法是能够准确地获得的模态特性的埋地和浸没的流体填充管，与SBFEM方法的计算速度相当。
Developing an understanding of guided wave propagation in multi-layered systems has important applications in non-destructive evaluation. This article presents a general weighted residual formulation for guided wave propagation in fluid-filled pipes buried in an elastic solid, or immersed in a quiescent fluid. A one-dimensional semi-analytic finite element (SAFE) approach is combined with a perfectly matched layer (PML), to compute dispersion curves for different pipe applications. The speed and accuracy of this approach are compared against the scaled boundary finite element method (SBFEM) and it is shown that for a rod immersed in a liquid the two methods provide very similar computational speeds. The speed and accuracy of the model is then investigated for immersed and buried fluid-filled pipes, and it is shown that when discretising the PML no advantage in computational speed is found when using either quadratic or higher order spectral elements, provided the number of degrees of freedom in the PML is equivalent. Accordingly, it is shown that the SAFE-PML method is capable of obtaining accurately the modal characteristics of buried and immersed fluid-filled pipes, with computational speeds comparable to the SBFEM approach.