Guided wave propagation and mode differentiation in hollow cylinders with viscoelastic coatings
Guided wave propagation and mode differentiation in hollow cylinders with viscoelastic coatings
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DOI：
10.1121/1.2940586
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发表时间：
2008-08-01
影响因子：
2.4
通讯作者：
Rose, Joseph L.
中科院分区：
文献类型：
--
作者：
Mu, Jing;Rose, Joseph L.
导波传播理论已经被广泛探索了大约一个世纪。早期的单层弹性空心圆柱体理论对于管道和管材系统的实际无损检测非常有益。圆柱体中的导波弯曲（非轴对称）模式可以由部分源载荷或任何非轴对称不连续性产生。它们对于导波模式控制和缺陷分析尤其重要。先前对多层空心圆柱结构中导波传播的研究主要集中在轴对称波模特性上。本文采用半解析有限元（SAFE）方法解决了带有粘弹性涂层的自由空心圆柱体中的导波传播问题。给出了轴对称和弯曲模式的导波色散曲线和衰减特性。由于SAFE计算得到的色散曲线模态难以区分，因此建立了模态排序方法，通过模态的正交性来区分模态。提供了粘弹性涂层空心圆柱体中导波模式之间正交性的理论证明。还根据含有粘弹性材料的多层圆柱结构的波力学来计算和讨论波结构。 (c) 2008 年美国声学学会。
Guided wave propagation theories have been widely explored for about one century. Earlier theories on single-layer elastic hollow cylinders have been very beneficial for practical nondestructive testing on piping and tubing systems. Guided wave flexural (nonaxisymmetric) modes in cylinders can be generated by a partial source loading or any nonaxisymmetric discontinuity. They are especially important for guided wave mode control and defect analysis. Previous investigations on guided wave propagation in multilayered hollow cylindrical structures mostly concentrate on the axisymmetric wave mode characteristics. In this paper, the problem of guided wave propagation in free hollow cylinders with viscoelastic coatings is solved by a semianalytical finite element (SAFE) method. Guided wave dispersion curves and attenuation characteristics for both axisymmetric and flexural modes are presented. Due to the fact that dispersion curve modes obtained from SAFE calculations are difficult to differentiate from each other, a mode sorting method is established to distinguish modes by their orthogonality. Theoretical proof of the orthogonality between guided wave modes in a viscoelastic coated hollow cylinder is provided. Wave structures are also calculated and discussed in view of wave mechanics in multilayered cylindrical structures containing viscoelastic materials. (c) 2008 Acoustical Society of America.