A NOVEL EFFICIENT APPROACH FOR DEFECT DETECTION IN PIPELINE STRUCTURES USING GUIDED ULTRASONIC WAVES
Detection of defects is a most important task in engineering subjects because a very tiny flaw in a structure might lead to a disaster at a later stage.In this paper, a novel, efficient and effective approach using guided ultrasonic waves for defect detection in pipeline structures is proposed.Based on boundary integral equations and Fourier transform of space wavenumber domain, this developed method for quantitative detection of defects comprises three stages: first, theoretical foundation of quantitative detection is established using the boundary integral equations and the term in the integral is defined as B(k), k for wavenumber, according to Born approximation.Subsequently, B(k) of a known defect can be written as B0(k) by Fourier transform of space-wavenumber domain to approximately represent the feature of an unknown defect in wavenumber domain.Finally, by combining B0(k) and reflection coefficients C(k), the location and shape of the unknown defect can be efficiently and effectively reconstructed.Several examples have been tested to demonstrate the correctness of the proposed methodology.It is concluded that the general two-dimensional surface defects can be efficiently detected by this novel approach.
Quantitative detection of Fourier transform Boundary integral equation Space-wavenumber domain Reflection coefficient
Yi-hui DA Gui-rong DONG Bin WANG Dian-zi LIU Zheng-hua QIAN
State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Aerospace Enginee Faculty of High Vocational Education, Xian University of Technology, Xian, China School of Mathematics, University of East Anglia, Norwich, UK, NR4 7TJ
国际会议
哈尔滨
英文
42-46
2019-01-11（万方平台首次上网日期，不代表论文的发表时间）