Optimization of excitation frequency and guided wave mode in acoustic wavenumber spectroscopy for shallow wall-thinning defect detection

Moon, Seongin; Ting, Kang; Han, Sang Do; Jeon, Jun-Young; Park, Gyuhae

doi:10.1007/s12206-018-1019-6

Cited by 17 publications

(10 citation statements)

References 9 publications

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“…While this is certainly promising for NDT in an industrial environment, there are other full-field guided wave NDT approaches which can do the same e.g. local wavenumber estimation [4][5][6][7][8], mode-removed weighted-root-mean-square energy mapping [18, 19,21] and nonlinear energy mapping [38]. The main advantages of using NL-LWDE for NDT is that the method is promising for detection of very deep defects (see [37,38]) which might be even out-of-sight.…”

Section: Nonlinear Local Wave-direction Estimation For Out-of-sight Damagesmentioning

confidence: 99%

“…Within this class, there are the methods which use the local change in wavenumber of a guided wave at a defect. These methods are referred to as local wavenumber estimation, acoustic wavenumber spectroscopy or instantaneous wavenumber estimation [4][5][6][7][8], depending on the implementation of the method. Other linear guided wave NDT methods focus on the local change in wave amplitude or energy rather than the change in wavenumber.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, a combination of the energy and the wavenumber methods has also been applied, where wavenumber filtering is performed prior to weighted-root-mean-square energy calculation [18,19]. While these NDT methods show promising results, they lack the sensitivity to detect very small and very deep defects [8,16,20]. Improved sensitivity to small and deep defects is obtained when using a broadband wavenumber filtering and energy mapping approach [21].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Nonlinear local wave-direction estimation for in-sight and out-of-sight damage localization in composite plates

Segers

Hedayatrasa

Poelman

et al. 2021

NDT & E International

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Section: Nonlinear Local Wave-direction Estimation For Out-of-sight Damagesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nonlinear local wave-direction estimation for in-sight and out-of-sight damage localization in composite plates

Segers

Hedayatrasa

Poelman

et al. 2021

NDT & E International

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“…In addition, these wavenumber approaches lack the sensitivity to detect deep defects (i.e. defect's depth > 80% of sample's thickness) [21,22]. Using specific filters in the wavenumber-frequency domain, it is possible to remove the vibrations that correspond to the Lamb modes travelling in damage-free material while retaining the vibrations attributed to defects.…”

Section: Introductionmentioning

confidence: 99%

Broadband nonlinear elastic wave modulation spectroscopy for damage detection in composites

Segers

Hedayatrasa

Poelman

et al. 2021

Structural Health Monitoring

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A non-destructive testing procedure is proposed for damage detection in composites using full wavefield measurement obtained using a scanning laser Doppler vibrometer. Vibrations are excited using two low-power piezoelectric actuators leading to nonlinear elastic wave modulation at the defect. One actuator is supplied with a broadband chirp signal and the other actuator is supplied with a single-frequency sine signal. First, a time–frequency filtering method is proposed to extract specific nonlinear components of interest (e.g. second higher harmonic and first modulation sideband) without the need for multiple excitation sequences. Next, damage maps are constructed using broadband bandpower calculation of the filtered nonlinear components. It is demonstrated that the modulation sidebands provide an exclusive imaging of defect nonlinearity, and are not affected by potential source nonlinearity. The proposed damage map construction procedure is applied for various carbon fiber reinforced polymer test specimens with different damage features: (1) coupon with quasi-static indentation damage, (2) coupon with artificial delaminations, (3) bicycle frame with impact damage, and (4) stiffened aircraft panel with partially debonded stiffener. The obtained results indicate the high performance of the developed procedure for detection of various defect types in curved and/or stiffened carbon fiber reinforced polymer components.

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“…The SLDV with continuous sinusoidal excitation by the lead zirconium titanate (PZT) has been developed using a wave number estimation for NDE applications. [7][8][9][10][11] SLDV is beneficial in using a single-frequency excitation and reception with LDV, which amplifies the energy in the structure, increasing the signal-to-noise ratio (SNR) significantly without requiring repeated measurements. Furthermore, operation safety is ensured using the low-power Class 1 laser.…”

Section: Introductionmentioning

confidence: 99%

Measurement of defects in a plate using dry-coupled interdigital transducer–based scanning laser Doppler vibrometer

Ting

Han

Moon

et al. 2020

Structural Health Monitoring

Self Cite

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The interdigital transducer–based scanning laser Doppler vibrometer has recently been introduced to efficiently generate the symmetric mode for damage detection of shallow defects in thick plates. To measure shallow defects in a carbon steel plate, the excitation frequency is optimized based on the analysis of wavenumber sensitivity and degree of separation between modes. Even though the interdigital transducer–based scanning laser Doppler vibrometer method using continuous excitation is a promising method for visualizing defects in plate-like structures, the interdigital transducer has to be coupled to media, such as oil or water, to minimize the variation in acoustic impedance between the lead zirconium titanate and the plate-like structures. In this study, we develop a dry-coupled interdigital transducer–based scanning laser Doppler vibrometer system for the detection of shallow defects in a plate to facilitate easy mounting and demounting from the plate. To verify the proposed dry-coupled interdigital transducer–based scanning laser Doppler vibrometer, plates with four and eight different depth defects are introduced, and it is demonstrated that the defects in thick plates measured by dry-coupled interdigital transducer–based scanning laser Doppler vibrometer are visualized compared to those measured by interdigital transducer–based scanning laser Doppler vibrometer.

show abstract

Optimization of excitation frequency and guided wave mode in acoustic wavenumber spectroscopy for shallow wall-thinning defect detection

Cited by 17 publications

References 9 publications

Nonlinear local wave-direction estimation for in-sight and out-of-sight damage localization in composite plates

Nonlinear local wave-direction estimation for in-sight and out-of-sight damage localization in composite plates

Broadband nonlinear elastic wave modulation spectroscopy for damage detection in composites

Measurement of defects in a plate using dry-coupled interdigital transducer–based scanning laser Doppler vibrometer

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