Dispersion-based Mode Identification of Ultrasonic Guided Waves

doi:10.3901/JME.2017.18.010

Abstract

Abstract: Mode identification of ultrasonic guided waves, which is always encountered in guided wave inspections, is a difficult problem. A dispersion-based mode identification approach is introduced, which distinguishes guided wave modes by their degree of dispersion. The degree of dispersion of some mode is found related with the second coefficient of Taylor expansion of this mode's wave number at the excitation frequency. Based on this dispersion feature of guided waves, a Chirplet dictionary with the time shear is designed. And then the guided wave signals are analyzed with the matching pursuit method based on this Chirplet dictionary. The optimal estimation of the second coefficient of Taylor expansion of wave number can be obtained by the matching pursuit method, and combined with the wavenumber-frequency dispersion relation calculated in advance, the guided wave modes can be recognized. The numerical simulation and experimental verification all show that the proposed mode identification method is effectively and correctly. The deficiency of this method is that it still cannot distinguish the severely overlapped guided wave modes. The study results help to improve the interpretation of complicated guided wave inspection signals, and generalize the application of guided wave inspection.

Key words: dispersion, matching pursuit, mode identification, ultrasonic guided wave

CLC Number:

TH112
TP24

WU Wenjun, ZHANG Linke, WANG Yuemin. Dispersion-based Mode Identification of Ultrasonic Guided Waves[J]. Journal of Mechanical Engineering, 2017, 53(18): 10-17.

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