A Baseline-Free Defect Imaging Technique in Plates Using Time Reversal of Lamb Waves

Jeong, Hyunjo; Cho, Sungjong; Wei, Wei

doi:10.1088/0256-307x/28/6/064301

Cited by 18 publications

(11 citation statements)

References 10 publications

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“…Furthermore, studies of Lamb waves mainly focus on the detection and localization of damages by a static network of sensors, consider only the direct transmission of the incident waves (e.g. [2,5,10]) and alleviate the effect of the reflections due to the boundaries that can also be received [7]. However, the localization of a mobile unit on a metal structure using Lamb waves is yet to be thoroughly investigated.…”

Section: Introductionmentioning

confidence: 99%

Monte-Carlo Localization on Metal Plates Based on Ultrasonic Guided Waves

Ouabi

Pomarède

Geist³

et al. 2021

Experimental Robotics

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In this work 4 , we propose a method based on a particle filter for the localization of an industrial robot on a large metal structure that leverages first-order reflections of acoustic waves on a metal plate edges. In our approach, the acoustic measurements are acquired in a (pseudo) pulse-echo mode using a co-localized emitter/receiver pair of piezoelectric transducers, and we assume a known size of the metal plate. To validate the method, the acquisition of acoustic data is made manually, but it is aimed to be performed by a robotic platform soon. The results demonstrate that with our approach, it is possible to recover the robot localization to a precision of a few millimeters.

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Section: Introductionmentioning

confidence: 99%

Monte-Carlo Localization on Metal Plates Based on Ultrasonic Guided Waves

Ouabi

Pomarède

Geist³

et al. 2021

Experimental Robotics

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“…To address this issue, researchers have done numerous work regarding baseline-free damage detection in the past decade [9,10]. Specifically, the TRP has been widely used for Lamb wave-based damage detection, as it can not only achieve dispersion self-compensation but also realize baseline-free damage detection in composite laminates [11][12][13][14][15]. In the TRP, an excitation signal is injected in one actuator, the response signal that captured by sensor is then time reversed and re-emitted at the sensor position.…”

Section: Introductionmentioning

confidence: 99%

An Efficient Time Reversal Method for Lamb Wave-Based Baseline-Free Damage Detection in Composite Laminates

Huang

Chen

et al. 2018

Applied Sciences

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Time reversal (TR) concept is widely used for Lamb wave-based damage detection. However, the time reversal process (TRP) faces the challenge that it requires two actuating-sensing steps and requires the extraction of re-emitted and reconstructed waveforms. In this study, the effects of the two extracted components on the performance of TRP are studied experimentally. The results show that the two time intervals, in which the waveforms are extracted, have great influence on the accuracy of damage detection of the time reversal method (TRM). What is more, it requires a large number of experiments to determine these two time intervals. Therefore, this paper proposed an efficient time reversal method (ETRM). Firstly, a broadband excitation is applied to obtain response at a wide range of frequencies, and ridge reconstruction based on inverse short-time Fourier transform is applied to extract desired mode components from the broadband response. Subsequently, deconvolution is used to extract narrow-band reconstructed signal. In this method, the reconstructed signal can be easily obtained without determining the two time intervals. Besides, the reconstructed signals related to a series of different excitations could be obtained through only one actuating-sensing step. Finally, the effectiveness of the ETRM for damage detection in composite laminates is verified through experiments.

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“…Baseline‐free detection in certain types of defects tends to be identified without direct comparison of test signals with baseline signals . One of baseline‐free detection techniques is based on time reversal method . Time reversal method has been applied in Lamb‐wave‐based detection on the basis of the time reversal concept in acoustics .…”

Section: Introductionmentioning

confidence: 99%

Delamination detection in composite plates by synthesizing time-reversed Lamb waves and a modified damage imaging algorithm based on RAPID

Liu

Zhong

Dong

et al. 2016

Struct. Control Health Monit.

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Combined with the modified damage imaging algorithm based on Reconstruction Algorithm for the Probabilistic Inspection of Damage (RAPID), a baseline-free detection method of the Lamb waves based on time reversal method is developed to detect the delamination in the composite plate. Through the analysis of the focus position of time reversal signal, a new calculation method of Damage Index (DI) values is proposed. The modified damage imaging algorithm based on RAPID is integrated with two image fusion methods: full summation method and full multiplication method. According to the analysis of limitations of the modified damage imaging algorithm, the transducer array is adopted, and the problem of the uneven probability distribution caused by the uneven density of sensing network is discussed. Modified methods are proposed to eliminate the influence of the uneven probability distribution and improve the accuracy and reliability of the detection results. The parameter β significantly affects the effective detection range of each sensing path in the modified damage imaging algorithm. The value of parameter β was experimentally determined and reasonably applied to detect the delamination. Based on the calculation of the DI of individual sensing path and the imaging results of delamination, the identification and localization of delamination were experimentally achieved. The imaging results demonstrated the problem of the uneven probability distribution and the validity of modified methods.

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A Baseline-Free Defect Imaging Technique in Plates Using Time Reversal of Lamb Waves

Cited by 18 publications

References 10 publications

Monte-Carlo Localization on Metal Plates Based on Ultrasonic Guided Waves

Monte-Carlo Localization on Metal Plates Based on Ultrasonic Guided Waves

An Efficient Time Reversal Method for Lamb Wave-Based Baseline-Free Damage Detection in Composite Laminates

Delamination detection in composite plates by synthesizing time-reversed Lamb waves and a modified damage imaging algorithm based on RAPID

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