Lamb wave frequency–wavenumber analysis and decomposition

Tian, Zhenhua; Yu, Lingyu

doi:10.1177/1045389x14521875

Cited by 119 publications

(79 citation statements)

References 43 publications

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“…The filtering process can be mathematically expressed as the product between the wavenumber-frequency spectrum U(k,f ) and filter function W(k,f ) [52,53,55]:…”

Section: Experimental Investigation Of Guided Wave Propagation Througmentioning

confidence: 99%

“…The wavenumber-frequency analysis has been reported as an effective means for wave mode identification and propagation analysis. The wavenumber-frequency representation of time-space wavefield data u(x,t) was performed by using the 2D Fourier transform (FT), which is defined as [50][51][52][53][54][55][56]:…”

Section: Experimental Investigation Of Guided Wave Propagation Througmentioning

confidence: 99%

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Ultrasonic Guided Wave Propagation through Welded Lap Joints

Jankauskas

Mažeika

2016

Metals

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Abstract:The objective of the research presented here is the investigation of ultrasonic guided wave (UGW) propagation through the lap joint welded plates used in the construction of a storage tank floors. The investigations have been performed using numerical simulation by finite element method (FEM) and tested by measurement of the transmission losses of the guided waves transmitted through the welded lap joints. Propagation of the symmetric S 0 mode in the welded stainless steel plates in the cases of different lap joint overlap width, operation frequency, and additional plate bonding caused by corrosion were investigated. It was shown that the transmission losses of the S 0 mode can vary in the range of 2 dB to 8 dB depending on the ratio between lap joint width and wavelength. It was also demonstrated that additional bonding in the overlap zone caused by corrosion can essentially reduce transmission losses.

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“…The filtering process can be mathematically expressed as the product between the wavenumber-frequency spectrum U(k,f ) and filter function W(k,f ) [52,53,55]:…”

Section: Experimental Investigation Of Guided Wave Propagation Througmentioning

confidence: 99%

Section: Experimental Investigation Of Guided Wave Propagation Througmentioning

confidence: 99%

Ultrasonic Guided Wave Propagation through Welded Lap Joints

Jankauskas

Mažeika

2016

Metals

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“…Then, a short space FT is applied to generate a space-frequency-wavenumber representation ( , , ) S f x k , as [11,17,18,51,52]:…”

Section: Wavenumber Nalysis For Amage Uantificationmentioning

confidence: 99%

“…In recent years, full time-space wavefields of guided waves, measured by non-contact laser Doppler vibrometers, have been extensively studied for use in damage detection [6][7][8][9][10][11][12]. The various methods developed to process full wavefield data for damage detection include: amplitude based imaging, wave filtering based imaging, and wavenumber based imaging, among others [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Wavenumber based imaging uses intrinsic wavenumber information obtained from the full wavefields for quantitative evaluation of the defects in metals and laminated composites [18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Multi-site delamination detection and quantification in composites through guided wave based global-local sensing

Tian¹,

Leckey²,

Yu³

2017

AIP Conference Proceedings

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Abstract. This paper presents a guided wave based global-local sensing method for rapid detection and quantification of multi-site delamination damage in large composite panels. The global-local approach uses a hybrid system consisting of a piezoelectric transducer (PZT) for generating guided waves and a non-contact scanning laser Doppler vibrometer (SLDV) for acquiring guided wave data. The global-local method is performed in two steps. First, a phased array configured of a small number of SLDV scan points (for example 10×10 points in a rectangular grid array) performs inspection over the entire plate to detect and locate damage. Local areas are identified as potential damage regions for the second step. Then high density wavefield measurements are taken over the identified areas and wavefield analysis is performed to quantitatively evaluate the damage. For the proof of concept in case with multi-site damage, the global-local approach is demonstrated on a carbon fiber reinforced polymer (CFRP) composite plate with two sites of impact-induced delamination damage. In the first step, the locations of two delamination sites are detected by the phased array method. In the second step, the delamination size and shape are evaluated using wavefield analysis. The detected delamination location, size and shape agree well with those of ultrasonic C-scan and the method led to a 93% reduction in inspection time compared to a full SLDV dense grid scan.

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“…This technique can be interpreted as an adoption and implementation of local wavenumber analysis [24] or short space Fourier transform [25] for the application of plate-like concrete structures. The technique is based on a full wave field dataset collected over a surface using an impact hammer and an accelerometer.…”

Section: Introductionmentioning

confidence: 99%

Lamb Wave Phase Velocity Imaging of Concrete Plates with 2D Arrays

Tofeldt

Rydén

2017

J Nondestruct Eval

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In the nondestructive evaluation of concrete structures, ultrasonic techniques are considered to be more capable than lowfrequency techniques such as the impact-echo method. This is especially true with the recent development of ultrasonic transducers, synthetic apertures, and results in an image form, and because low-frequency techniques are usually limited in their evaluation to the frequency of one single resonant mode. With the aim of reducing this gap in capabilities, we present a 2D array and wide-frequency bandwidth technique for Lamb wave phase velocity imaging. The presentation involves a measurement on a newly cast concrete plate using a hammer and an accelerometer as an example. The key concept of the technique is the use of 2D arrays that record a full wave field response over a limited surface subdomain within the complete measurement domain. Through a discrete Fourier transform, a spectral estimate is obtained for the 2D array in the frequencyphase velocity domain. The variation of the phase velocity is then mapped using a stepwise movement of the 2D array within the complete measurement domain. With two different types of 2D arrays, the variation of the phase velocity for the A0 Lamb mode is mapped and displayed in a polar and image plot, and low variation is observed for both cases. This result verifies the expected condition of a homogenous material and plate thickness and, more importantly, highlights the potential of wide-frequency bandwidth techniques based on full wave field data.

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Lamb wave frequency–wavenumber analysis and decomposition

Cited by 119 publications

References 43 publications

Ultrasonic Guided Wave Propagation through Welded Lap Joints

Ultrasonic Guided Wave Propagation through Welded Lap Joints

Multi-site delamination detection and quantification in composites through guided wave based global-local sensing

Lamb Wave Phase Velocity Imaging of Concrete Plates with 2D Arrays

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