Time reversal method for guided wave inspection in pipes

被引：7

作者：

Deng F. ^{[1
]}

Wu B. ^{[1
]}

He C. ^{[1
]}

机构：

[1] College of Mechanical Engineering and Applied Electronic Technology, Beijing University of Technology

来源：

Frontiers of Mechanical Engineering in China | 2008年 / 3卷 / 3期

基金：

中国国家自然科学基金;

关键词：

Acoustic guided wave; Circumferential locating; Energy focusing; Time reversal;

D O I：

10.1007/s11465-008-0050-1

中图分类号：

学科分类号：

摘要：

The application of the time reversal method in pipe-like structures based on finite element method (FEM) is investigated. A steel pipe model measuring 70 mm x 3.5 mm is used to analyze the reflection coefficient of the L(0,2) mode with the time reversal process. Simulation results show that the time reversal array method is beneficial to the improvement of the signalto-noise ratio of a guided wave inspection system. As the intercepting window is widened, more energy is included in re-emitted signals, which leads to a large reflection coefficient of the L(0,2) mode. In parallel, a circumferential locating method based on the time reversal method is described. The time reversal process used for guided wave inspection leads to the temporal and spatial focusing. When the time reversal signals are re-emitted, the angular profile obtained at the axial location of the defect can be used to determine the circumferential location of the defect. Except for a pipe with one defect, the circumferential locating method has been verified on another pipe model with two defects. Meanwhile, the elements number of the time reversal array has been discussed for enhancing the discrimination of the defect circumferential location. © 2008 Higher Education Press and Springer-Verlag GmbH.

引用

页码：251 / 260

页数：9

共 23 条

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