Linear and Nonlinear Guided Wave Imaging of Impact Damage in CFRP Using a Probabilistic Approach

Hettler, Jan; Tabatabaeipour, Morteza; Delrue, Steven; Abeele, Koen Van Den

doi:10.3390/ma9110901

Cited by 55 publications

(37 citation statements)

References 34 publications

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“…The quality of the reconstructed image depends on the correct estimation of grid values. Based on the visualization of propagation rays and the grid graph, an ellipse-based spatial interpolation (EBSI for short) method for image reconstruction has been developed in recent years [25,31,32]. As shown in Figure 1c, each ray affects the surrounding area (called affected zone) and the shape of the affected zone is elliptical.…”

Section: Ellipse-based Spatial Interpolation and Image Reconstructionmentioning

confidence: 99%

Image Reconstruction of Internal Defects in Wood Based on Segmented Propagation Rays of Stress Waves

Feng

et al. 2018

Applied Sciences

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In order to detect the size and shape of defects inside wood, an image reconstruction method based on segmented propagation rays of stress waves is proposed. The method uses sensors to obtain the stress wave velocity data by hanging around the timber equally, visualizes those data, and reconstructs the image of internal defects with the visualized propagation rays. The basis of the algorithm is precisely segmenting the rays to benefit the spatial interpolation. First, a ray segmentation algorithm using the elliptical neighborhood technique is proposed, which can be used to segment the rays and estimate the velocity values of segmented rays by the nearby original rays using elliptical zones. Second, a spatial interpolation algorithm utilizing a segmented ellipse according to the segmented rays is also proposed, which can be used to estimate the velocity value of a grid cell by the segmented ellipses corresponding to the nearby segmented rays. Then, the image of the internal defect inside the wood is reconstructed. Both simulation and experimental data were used to evaluate the proposed method, and the area and shape of the imaging results were analyzed. The comparison results show that the proposed method can produce high quality reconstructions with clear edges and high accuracy.

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Section: Ellipse-based Spatial Interpolation and Image Reconstructionmentioning

confidence: 99%

Image Reconstruction of Internal Defects in Wood Based on Segmented Propagation Rays of Stress Waves

Feng

et al. 2018

Applied Sciences

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“…As in references [43,44,45,46], conducting researches on the nonlinear behavior of the damage and capturing more information for a damage indicator is an important and interesting aspect for achieving a more robust damage detection.…”

Section: Discussionmentioning

confidence: 99%

A Modified Lamb Wave Time-Reversal Method for Health Monitoring of Composite Structures

Zeng

Lin

Huang

2017

Sensors

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Because the time reversal operator of Lamb waves varies with frequency in composite structures, the reconstructed signal deviates from the input signal even in undamaged cases. The damage index captures the discrepancy between the two signals without differentiating the effects of time reversal operator from those of damage. This results in the risk of false alarm. To solve this issue, a modified time reversal method (MTRM) is proposed. In this method, the frequency dependence of the time reversal operator is compensated by two steps. First, an amplitude modulation is placed on the input signal, which is related to the excitability, detectability, and attenuation of the Lamb wave mode. Second, the damage index is redefined to measure the deviation between the reconstructed signal and the modulated input signal. This could indicate the presence of damage with better performance. An experimental investigation is then conducted on a carbon fiber-reinforced polymer (CFRP) laminate to illustrate the effectiveness of the MTRM for identifying damage. The results show that the MTRM may provide a promising tool for health monitoring of composite structures.

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“…Each detection technology has its unique advantages and limitations. Hybrid detection systems have the potential to combine multiple advantages and to break through the bottleneck of existing technologies, such as laser ultrasound combined with electromagnetic ultrasound, piezoelectric ultrasound and laser ultrasound, etc., [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Noncontact Damage Topography Reconstruction by Wavenumber Domain Analysis Based on Air-Coupled Ultrasound and Full-Field Laser Vibrometer

Hui

Liang

Rui

et al. 2021

Sensors

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Noncontact ultrasonic detection technology is an effective method to detect damage in time. This paper proposes a noncontact damage detection system based on air-coupled ultrasound and full-field laser vibrometer, which realizes the excitation of relatively single-mode guided waves and the wavefield automatic detection. The system performance is verified through experiments, and the experimental wavenumber is consistent with the theoretical dispersion characteristics of the Lamb wave in the A0 mode. Based on this system, the topography reconstruction algorithms, including the Wavenumber Filtering Algorithm and Spatial Wavenumber Algorithm, were tested and compared with the aluminum alloy plate and the carbon fiber reinforced polymer plate. The results show that, based on the air-coupled ultrasound and full-field laser vibrometer detection system, the Spatial Wavenumber Algorithm has better imaging error and contrast, and the damage edge detection is smoother.

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Linear and Nonlinear Guided Wave Imaging of Impact Damage in CFRP Using a Probabilistic Approach

Cited by 55 publications

References 34 publications

Image Reconstruction of Internal Defects in Wood Based on Segmented Propagation Rays of Stress Waves

Image Reconstruction of Internal Defects in Wood Based on Segmented Propagation Rays of Stress Waves

A Modified Lamb Wave Time-Reversal Method for Health Monitoring of Composite Structures

Noncontact Damage Topography Reconstruction by Wavenumber Domain Analysis Based on Air-Coupled Ultrasound and Full-Field Laser Vibrometer

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