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http://hdl.handle.net/10397/94047
Title: | A nonlinearity-sensitive approach for detection of “breathing” cracks relying on energy modulation effect | Authors: | Cao, M Lu, Q Su, Z Radzieński, M Xu, W Ostachowicz, W |
Issue Date: | Apr-2022 | Source: | Journal of sound and vibration, Apr. 2022, v. 524, 116754 | Abstract: | For a cracked structural component under a single-tone harmonic excitation, the opening-closing motion of the “breathing” crack can lead to higher harmonics in its steady-state responses, which can be efficient indicators for the detection of the crack. Nevertheless, when the opening-closing motion of a “breathing” crack is slight, higher harmonics can become barely visible in frequency spectra and seem to be hidden. As a consequence, the crack can hardly be detected by such hidden higher harmonics. Addressing this problem, this study proposes a nonlinearity-sensitive approach for the detection of “breathing” cracks. In particular, a novel phenomenon of energy modulation effect (EME) is reported, based on which a new concept of quadratic Teager-Kaiser energy (Q-TKE) is formulated. Hidden higher harmonics can be considerably enhanced in Q-TKEs, such that “breathing” cracks can be readily detected. A physical insight into the mechanism of the EME is provided. The approach is numerically verified using the finite element method and experimentally validated through non-contact laser measurement. The results suggest that hidden higher harmonics can be considerably enhanced in the Q-TKEs and become sensitive indicators to manifest the occurrence of the cracks, suitable for the detection of initial fatigue cracks. | Keywords: | Energy modulation effect Higher harmonics Non-contact laser measurement Quadratic Teager-Kaiser energy “Breathing” crack |
Publisher: | Academic Press | Journal: | Journal of sound and vibration | ISSN: | 0022-460X | EISSN: | 1095-8568 | DOI: | 10.1016/j.jsv.2022.116754 |
Appears in Collections: | Journal/Magazine Article |
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