Lamb Wave Based Structural Damage Detection Using Stationarity Tests

Article Engineering, Mechanical

Explainable 1-D convolutional neural network for damage detection using Lamb wave

Pushpa Pandey et al.

Summary: Researchers are exploring data-driven machine learning techniques for damage identification using Lamb wave response. 1D CNN model is used with LIME to interpret damage features accurately with 100% accuracy in damage detection.

MECHANICAL SYSTEMS AND SIGNAL PROCESSING (2022)

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Article Engineering, Mechanical

A focusing MUSIC algorithm for baseline-free Lamb wave damage localization

Caibin Xu et al.

Summary: A focusing MUSIC algorithm is proposed for baseline-free Lamb wave damage localization, utilizing virtual time reversal technique to compensate dispersion effect and eliminating the need for baseline subtraction and estimation of the number of scattering sources.

MECHANICAL SYSTEMS AND SIGNAL PROCESSING (2022)

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Article Engineering, Mechanical

New results for the ADF statistic in nonstationary signal analysis with a view towards structural health monitoring

K. Worden et al.

Summary: This paper presents new results in nonstationary signal analysis, specifically focusing on the ADF test statistic. The ADF statistic is interpreted as counting the cycles of the dominant frequency component in a sample, and a critical frequency f(c) is identified for distinguishing stationary and nonstationary components. The idea of decomposing signals into stationary and nonstationary components is illustrated using wavelet/multiresolution analysis.

MECHANICAL SYSTEMS AND SIGNAL PROCESSING (2021)

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Article Chemistry, Physical

Comparison of Ultrasonic Non-Contact Air-Coupled Techniques for Characterization of Impact-Type Defects in Pultruded GFRP Composites

Aadhik Asokkumar et al.

Summary: This article compares different air-coupled ultrasonic testing methods for characterizing impact-type defects in GFRP composite plates. The through transmission technique provides higher resolution for defect sizing and shape determination, but requires access to both sides of the sample. On the other hand, the guided wave technique allows single-side inspection and is faster, but has limitations in determining defect shape.

MATERIALS (2021)

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Article Chemistry, Physical

Optimization of Nonlinear Lamb Wave Detection System Parameters in CFRP Laminates

Zhenhua Yin et al.

Summary: The accuracy of nonlinear ultrasonic nondestructive testing highly depends on the cycle number, output level, and gain of the nonlinear ultrasonic detection system. Response surface surrogate models were established to improve the accuracy of damage assessment in CFRP laminates and optimize detection system parameters. The optimized response surface was achieved at eight cycles, an output level of 42, and a gain of 32 dB, providing operational stability, high accuracy, and reliability for the nonlinear ultrasonic detection system.

MATERIALS (2021)

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Article Chemistry, Physical

Imaging of Increasing Damage in Steel Plates Using Lamb Waves and Ultrasound Computed Tomography

Monika Zielinska et al.

Summary: This study utilizes guided Lamb waves and ultrasound computed tomography to detect defects in steel plates and estimate damage size, demonstrating the potential of ultrasound tomography in detecting defects in steel elements.

MATERIALS (2021)

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Article Acoustics