T型加强筋板中A₀模态兰姆波的透射特性分析

Analysis of Transmission Characteristics of A ₀ Mode Lamb Waves in T-type Stiffened Plates

摘要

超声兰姆波在金属整体壁板结构健康监测中具有巨大的应用潜力,但壁板中含的加强筋结构使兰姆波的传播特性变得复杂,限制了超声兰姆波的应用。该文基于2D-FFT方法准确计算了典型截面类型T型加强筋板中兰姆波的透射特性。仿真和实验测量的透射系数谱高度吻合,一致揭示了加强筋结构对透射兰姆波有梳状滤波效应。分析了梳状滤波特性随加强筋结构上折弯长度的变化规律。同时,测试了加强筋内部声场信息,根据驻波场理论解释了加强筋板中梳状滤波效应的产生机理。该研究可用于指导兰姆波对加强筋板结构进行检测时频率的合理选择,扩大兰姆波对缺陷的有效检测范围,极大促进了兰姆波在整体壁板结构监测中的应用。

Abstract

Ultrasonic Lamb waves have great potential for structural health monitoring of metal monolithic wall panels, however, stiffeners contained in the wall panels complicate the propagation characteristics of the Lamb waves and limit the application of ultrasonic Lamb waves. In this study, the transmission characteristics of Lamb waves in the typical T-type of stiffener plate were calculated using 2D-FFT method. The experimental and simulation results are in strong agreement, both indicating that the stiffener structure can be considered as a comb filter. The variation rule of the comb filtering effect with the length of the bending on the T-type stiffener was revealed. Furthermore, the ultrasonic field information inside the stiffened plate was tested, and the generation mechanism of the comb filtering effect in the reinforced plate was explained according to the standing wave field theory. This study provides a basis for the reasonable frequency selection of Lamb waves for detecting the stiffened plate structure, expanding the effective detection of defects by Lamb waves, and significantly facilitate the application of Lamb waves in monitoring the health of integrated wall plate structures.

关键词

超声兰姆波 / T型加强筋板 / 透射特性 / 梳状滤波器 / 超声驻波场 / 结构健康监测

Key words

ultrasonic Lamb wave / T-type stiffened plates / transmission characteristics / comb filter / ultrasonic standing wave field / structural health monitoring

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基金资助

国家自然科学基金资助项目(12272014)