31 March 2011 Breathing crack localization using bio-inspired combination tone
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A new damage detection technique is presented which can localize a breathing crack in a metallic rod-like structure. Biologically inspired by the combination tone phenomenon which occurs in the human auditory system, the nonlinear signal produced at the difference combination frequency of the two harmonic excitation frequencies ( f1 - f2 ) is used to detect and localize the breathing crack. An experimental investigation is performed to verify the proposed approach. Compared to previously introduced techniques for detection of breathing cracks based on super-harmonic or subharmonic nonlinear response signals, the proposed approach is much more robust and easier to implement.
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Gi-Woo Kim, Gi-Woo Kim, David R. Johnson, David R. Johnson, Fabio Semperlotti, Fabio Semperlotti, K. W. Wang, K. W. Wang, "Breathing crack localization using bio-inspired combination tone", Proc. SPIE 7984, Health Monitoring of Structural and Biological Systems 2011, 79841Q (31 March 2011); doi: 10.1117/12.880159; https://doi.org/10.1117/12.880159

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