Detection of local defect resonance frequencies using bicoherence analysis

Roy, Subhankar; Bose, Tanmoy; Debnath, Kishore

doi:10.1016/j.jsv.2018.12.006

Cited by 32 publications

(12 citation statements)

References 15 publications

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“…Recently, a 3D infrared SLDV has been used by the present authors demonstrating that the concept of LDR can be equally extended toward the in-plane vibrations [3]. Detection of LDRs in operational deflection shapes for defect detection in composites has been shown to be successful for flat bottom holes (FBH) [4][5][6][7][8][9][10][11], inserts [10][11][12][13], disbonds [8,9,12,14] and barely visible impact damages (BVID) [3,[10][11][12][15][16][17][18]. Despite these promising experimental studies, a critical remark has to be made concerning the depth of the investigated damages.…”

Section: Introductionmentioning

confidence: 86%

Probing the limits of full-field linear local defect resonance identification for deep defect detection

et al. 2020

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Section: Introductionmentioning

confidence: 86%

Probing the limits of full-field linear local defect resonance identification for deep defect detection

et al. 2020

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“…Finally, the analytically and numerically determined LDR frequencies ( f d ) are compared with experiments by exciting the plate using chirp signals. 19,20…”

Section: Methodsmentioning

confidence: 99%

Relative acoustic nonlinearity parameter variation with local defect resonance frequencies and its different harmonics

Hanuman

Bose

2022

Noise & Vibration Worldwide

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In recent times, nonlinear ultrasonic inspection has become a very reliable technique to characterize micro-scale cracks and small-scale delaminations. In this paper, an analytical framework is developed for the orthotropic composite plate to calculate the variation of relative acoustic nonlinearity parameter, a quantitative measurement of nonlinearity at the delamination region. The analytical investigation is justified with numerical and experimental research using a carbon fiber-reinforced polymer (CFRP) plate with three delaminations. Two incident waves are used for excitation, out of which the first wave frequency is varied as local defect resonance (LDR) frequency ( fd), subharmonic LDR frequency (2 fd), second-order superharmonic LDR frequency ( fd/2), and third-order superharmonic LDR frequency ( fd/3) while the second incident wave is taken as a single periodic frequency. Different delamination sizes, positions, and depths were used to understand the second-order relative acoustic nonlinearity parameter ( β2) with other LDR frequencies as well as its harmonics. It has been observed from analytical, numerical, and experimental results that the relative acoustic nonlinearity parameter is maximum at LDR frequencies. It increases in case of surface level delaminations.

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“…As an example, the inspection area of the CFRP plate with side-delaminations is reduced to two small square areas of around 40 × 40 mm 2 (indicated Area 1 and Area 2 in Figure 8a). The measurement results at these small areas are used to not only detect [32], but also to localize the out-of-sight side-delaminations. The nonlinear radiation of defects is further exploited in order to detect out-of-sight defects.…”

Section: Opportunities For Out-of-sight Damage Detectionmentioning

confidence: 99%

Nonlinear Elastic Wave Energy Imaging for the Detection and Localization of In-Sight and Out-of-Sight Defects in Composites

et al. 2020

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In this study, both linear and nonlinear vibrational defect imaging is performed for a cross-ply carbon fiber-reinforced polymer (CFRP) plate with artificial delaminations and for a quasi-isotropic CFRP with delaminations at the edge. The measured broadband chirp vibrational response is decomposed into different components: the linear response and the nonlinear response in terms of the higher harmonics. This decomposition is performed using the short-time Fourier transformation combined with bandpass filtering in the time-frequency domain. The linear and nonlinear vibrational response of the defect is analyzed by calculation of the defect-to-background ratio. Damage maps are created using band power calculation, which does not require any user-input nor prior information about the inspected sample. It is shown that the damage map resulting from the linear band power shows high sensitivity to shallow defects, while the damage map associated to the nonlinear band power shows a high sensitivity to both shallow and deep defects. Finally, a baseline-free framework is proposed for the detection and localization of out-of-sight damage. The damage is localized by source localization of the observed nonlinear wave components in the wavenumber domain.

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Detection of local defect resonance frequencies using bicoherence analysis

Cited by 32 publications

References 15 publications

Probing the limits of full-field linear local defect resonance identification for deep defect detection

Probing the limits of full-field linear local defect resonance identification for deep defect detection

Relative acoustic nonlinearity parameter variation with local defect resonance frequencies and its different harmonics

Nonlinear Elastic Wave Energy Imaging for the Detection and Localization of In-Sight and Out-of-Sight Defects in Composites

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