Time reversal method for damage detection of cracked plates in the medium frequency range: the case of wavelength-size cracks

Pasco, Yann; Pinsonnault, Jérôme; Berry, Alain; Masson, Patrice; Micheau, Philippe

doi:10.1117/12.658612

Cited by 4 publications

(4 citation statements)

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“…Time reversal method has been tried to transmit a dispersed Lamb wave over a particular distance and obtain a simple waveform with improved SNR and space resolution for NDE applications [12]. Also, time reversal method has been used to focus Lamb wave energy to detect flaws or damages in plates [13][14][15][16]. More recently, Lamb wave time reversal method was introduced as a baseline-free SHM technique [8,17].…”

Section: Lamb Wave Time Reversalmentioning

confidence: 99%

Single Mode Tuning Effects on Lamb Wave Time Reversal with Piezoelectric Wafer Active Sensors for Structural Health Monitoring

2007

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Lamb wave time reversal method is a new and tempting baseline-free damage detection technique for structural health monitoring. With this method, certain types of damage can be detected without baseline data. However, the application of this method using piezoelectric wafer active sensors (PWAS) is complicated by the existence of at least two Lamb wave modes at any given frequency, and by the dispersion nature of the Lamb wave modes existing in thin-wall structures. The theory of PWAS-related Lamb wave time reversal has not yet been fully studied.This paper addresses this problem by developing a theoretical model for the analysis of PWAS-related Lamb wave time reversal based on the exact solutions of the RayleighLamb wave equation. The theoretical model is first used to predict the existence of single-mode Lamb waves. Then the time reversal behavior of single-mode and two-mode Lamb waves is studied numerically. The advantages of singlemode tuning in the application of time reversal damage detection are highlighted. The validity of the proposed theoretical model is verified through experimental studies. In addition, a similarity metric for judging time invariance of Lamb wave time reversal is presented. It is shown that, under certain condition, the use of PWAS-tuned single-mode Lamb waves can greatly improve the effectiveness of the time-reversal damage detection procedure.

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Section: Lamb Wave Time Reversalmentioning

confidence: 99%

Single Mode Tuning Effects on Lamb Wave Time Reversal with Piezoelectric Wafer Active Sensors for Structural Health Monitoring

2007

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“…Time reversal method has been tried to transmit a dispersed Lamb wave over a particular distance and obtain a simple waveform with improved SNR and space resolution for NDE applications [12]. Also, time reversal method has been used to focus Lamb wave energy to detect flaws or damages in plates [13][14] [15]. More recently, Lamb wave time reversal method was introduced as a baseline-free SHM technique [8] [16].…”

Section: Lamb Wave Time Reversalmentioning

confidence: 99%

“…Where N is the number of points in the plot, and i, j denote the two plots under comparison. This method compares the amplitude of two sets of data and assigns a scalar value based on the formula (15). The similarity value ranges from 0 to 1 as the two sets of data vary from "not related" to "identical".…”

Section: Time Invariance Of Lamb Wave Time Reversalmentioning

confidence: 99%

Lamb waves time-reversal method using frequency tuning technique for structural health monitoring

Giurgiutiu

2007

SPIE Proceedings

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Lamb wave time reversal method is a new and tempting baseline-free damage detection technique for structural health monitoring. With this method, certain types of damage can be detected without baseline data. However, the application of this method to thin-wall structures is complicated by the existence of at least two Lamb wave modes at any given frequency, and by the dispersion nature of the Lamb wave modes existing in thin-wall structures. The theory of Lamb wave time reversal has not yet been fully studied. This paper addresses this problem by developing a theoretical model for the analysis of Lamb wave time reversal in thin-wall structures based on the exact solutions of the Rayleigh-Lamb wave equation. The theoretical model first used to predict the existence of single-mode Lamb waves. Then the time reversal behavior of singlemode and two-mode Lamb waves is studied numerically. The advantages of single-mode tuning in the application of time reversal damage detection are highlighted. The validity of the proposed theoretical model is verified through experimental studies. In addition, a similarity metric for judging time invariance of Lamb wave time reversal is presented. It is shown that, under certain condition, the use of PWAS-tuned single-mode Lamb waves can greatly improve the effectiveness of the time-reversal damage detection procedure.

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“…Lower frequencies, used in modal techniques, need less signal processing but are less sensitive to small damage [8]. Finally, a medium frequency range seems to be a good compromise since it has already been used in the past to localize damages in large plates using wave propagation approaches [9][10][11] or using the variation of frequency response in a damaged riveted structure [12].…”

Section: Introductionmentioning

confidence: 99%

Parametric identification of a transmission line model forin situdamage characterization in lap joints

Francoeur

Micheau

Masson

2009

Smart Mater. Struct.

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This paper presents an in situ damage identification method to characterize the thickness and location of a notch in a one-dimensional lap joint. The approach uses the propagation of flexural waves generated by a piezoceramic (PZT) to evaluate the global reflection coefficient of a complex structure such as a lap joint. A transmission line model (TLM) is used to describe the theoretical reflection coefficient from healthy and damaged lap joints. Parameters from the lap joint are identified in two steps from the experimental measurement of the reflection coefficient. The first step is a calibration step which gives, for the healthy lap joint, the length of the lap joint and distance between the measurement point and the lap joint. The identification of these parameters is performed by minimizing a cost function evaluated for different combinations of parameters. The second step allows us to obtain the parameters associated with the notch, which are its location and thickness. Several cases of healthy and damaged lap joints are conducted and very good results are achieved for the identification of the parameters.

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Time reversal method for damage detection of cracked plates in the medium frequency range: the case of wavelength-size cracks

Cited by 4 publications

References 0 publications

Single Mode Tuning Effects on Lamb Wave Time Reversal with Piezoelectric Wafer Active Sensors for Structural Health Monitoring

Single Mode Tuning Effects on Lamb Wave Time Reversal with Piezoelectric Wafer Active Sensors for Structural Health Monitoring

Lamb waves time-reversal method using frequency tuning technique for structural health monitoring

Parametric identification of a transmission line model forin situdamage characterization in lap joints

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