Baseline subtraction technique in the frequency–wavenumber domain for high sensitivity damage detection |
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Authors: | Peter McKeon Slah Yaacoubi Nico F Declercq Salah Ramadan Weina K Yaacoubi |
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Institution: | 1. UMI Georgia Tech – CNRS 2958, Metz Technopole, 2 rue Marconi, 57070 Metz, France;2. Institut de Soudure, 4 boulevard Henri Becquerel, 57970 Yutz, France |
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Abstract: | This paper suggests a method for high-sensitivity damage detection. The method is based on pitch-catch measurements of Lamb waves combined with a baseline subtraction technique in the frequency–wavenumber domain. Small amplitude converted modes, generated during the interaction of propagating waves with damage, can thus be detected with minimal a priori information regarding their expected location in the frequency–wavenumber plane. This method is applied in the present paper to a case of notches with varied depth. Finite element simulations are carried out in the temporal domain to mimic results obtainable in real-world experiments. Two cases are studied, namely when each of the two pure fundamental modes are incident on a notch. The advantages of the method are detailed. The procedure to implement this method is described in the context of Structural Health Monitoring (SHM) or Non-Destructive Testing (NDT). |
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Keywords: | Baseline subtraction Frequency&ndash wavenumber domain Lamb waves Mode conversion Damage Spectral leakage |
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