Finite element model for waves guided along solid systems of arbitrary section coupled to infinite solid media
Finite element model for waves guided along solid systems of arbitrary section coupled to infinite solid media
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DOI：
10.1121/1.2821973
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发表时间：
2008-02-01
影响因子：
2.4
通讯作者：
Lowe, Michael
中科院分区：
文献类型：
--
作者：
Castaings, Michel;Lowe, Michael
半解析有限元(SAFE)方法是计算波在任意截面形状但传播方向不变的波导中传播的一种简便方法。许多研究人员报道了与无损弹性波有关的工作，最近提出了弹性波导中非传播波和粘弹性波导中复杂波的解。本文提出了进一步的发展，解决了衰减波的问题，其中衰减是由从波导泄漏到周围材料引起的。这与许多实际问题具有广泛的相关性，在这些问题中，波导被浸在流体中或嵌入在固体中。本文介绍了一种程序的原理，并用一些例子验证和说明了它的应用。该方法利用了离散化区域外部边界处的材料吸收区域。(C)2008年美国声学学会。
The Semi-Analytical Finite Element (SAFE) method is becoming established as a convenient method to calculate the properties of waves which may propagate in a waveguide which has arbitrary cross-sectional shape but which is invariant in the propagation direction. A number of researchers have reported work relating to lossless elastic waves, and recently the solutions for nonpropagating waves in elastic guides and for complex waves in viscoelastic guides have been presented. This paper presents a further development, addressing the problem of attenuating waves in which the attenuation is caused by leakage from the waveguide into a surrounding material. This has broad relevance to many practical problems in which a waveguide is immersed in a fluid or embedded in a solid. The paper presents the principles of a procedure and then validates and illustrates its use on some examples. The procedure makes use of absorbing regions of material at the exterior bounds of the discretized domain. (c) 2008 Acoustical Society of America.