Wave structure analysis of guided waves in a bar with an arbitrary cross-section
Wave structure analysis of guided waves in a bar with an arbitrary cross-section
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DOI：
10.1016/j.ultras.2005.06.006
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发表时间：
2006-01-01
期刊：
影响因子：
4.2
通讯作者：
Murase, M
中科院分区：
文献类型：
--
作者：
Hayashi, T;Tamayama, C;Murase, M
色散曲线和波结构（棒材横截面上的位移分布）对于导波无损检测至关重要。本文使用一种称为半解析有限元法 (SAFEM) 的特殊建模技术推导了具有任意横截面的杆的理论色散曲线和波浪结构。还显示了基于波结构和模态分析的棒状结构导波无损检测指南。首先，获得了方棒的色散曲线与其相应的波结构之间的关系。纵向振动模式具有较高的群速度，扭转模式具有恒定的相位和群速度。接下来，详细介绍钢轨的色散曲线和波浪结构之间的关系。导轨用于表示具有复杂横截面的杆。与方杆结果类似，轨道的纵向模式具有更高的群速度。然而，轨道包含具有局部振动的模式。最后，介绍了单模检测和激励技术。可以通过使用与特定模式的波结构相对应的加权函数进行检测和激励来获得单一模式。 (c) 2005 Elsevier B.V. 保留所有权利。
Both dispersion curves and wave structures, which are displacement distributions on a bar cross-section, are essential for guided wave NDEs. Theoretical dispersion curves and wave structures for a bar with an arbitrary cross-section are derived in this paper using a special modeling technique called the semi-analytical finite element method (SAFEM). The guidelines for guided wave NDEs of bar-like structures are also shown based on wave structure and modal analysis. First, the relationship between the dispersion curves and their corresponding wave structures were obtained for a square rod. Modes with longitudinal vibration have higher group velocities and torsional modes have constant phase and group velocities. Next, the relationship between the dispersion curves and wave structures for a rail are detailed. The rail is used to represent a bar with a complex cross-section. Similar to the square rod results, the rail's longitudinal modes have higher group velocities. However, the rail contains modes with local vibration. Finally, single mode detection and excitation techniques are introduced. A single mode can be obtained by detecting and exciting with a weighted function that corresponds to a specific mode's wave structure. (c) 2005 Elsevier B.V. All rights reserved.