A time reversal damage imaging method for structure health monitoring using Lamb waves

Zhang, Haiyan; Cao, Yaping; Sun, Xuehua; Chen, Xianhua; Yu, Jianbo

doi:10.1088/1674-1056/19/11/114301

Cited by 8 publications

(3 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Their attractive features include sensitivity to a variety of damage types and the capability of traveling relatively long distances [2]. Damage imaging methods based on Lamb waves have been widely studied by many researchers, such as delay-and-sum (DAS) imaging [3,4], time reversal focusing imaging [5,6], diffraction tomography imaging [7], and ultrasonic phased array [8].…”

Section: Introductionmentioning

confidence: 99%

Lamb Wave Local Wavenumber Approach for Characterizing Flat Bottom Defects in an Isotropic Thin Plate

Fan

Zhang

et al. 2018

Applied Sciences

View full text Add to dashboard Cite

This paper aims to use the Lamb wave local wavenumber approach to characterize flat bottom defects (including circular flat bottom holes and a rectangular groove) in an isotropic thin plate. An air-coupled transducer (ACT) with a special incidence angle is used to actuate the fundamental anti-symmetric mode (A0). A laser Doppler vibrometer (LDV) is employed to measure the out-of-plane velocity over a target area. These signals are processed by the wavenumber domain filtering technique in order to remove any modes other than the A0 mode. The filtered signals are transformed back into the time-space domain. The space-frequency-wavenumber spectrum is then obtained by using three-dimensional fast Fourier transform (3D FFT) and a short space transform, which can retain the spatial information and reduce the magnitude of side lobes in the wavenumber domain. The average wavenumber is calculated, as a real signal usually contains a certain bandwidth instead of the singular frequency component. Both simulation results and experimental results demonstrate that the average wavenumber can be used not only to identify shape, location, and size of the damage, but also quantify the depth of the damage. In addition, the direction of an inclined rectangular groove is obtained by calculating the image moments under grayscale. This hybrid and non-contact system based on the local wavenumber approach can be provided with a high resolution.

show abstract

Section: Introductionmentioning

confidence: 99%

Lamb Wave Local Wavenumber Approach for Characterizing Flat Bottom Defects in an Isotropic Thin Plate

Fan

Zhang

et al. 2018

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…Besides, the space-time focusing property of the TR electromagnetic wave is also helpful to improve imaging resolution. [14][15][16][17][18][19] Later reports indicate that the near-field scatters can be replaced by micro-patternsetched array elements. Subwavelength arrays composed of such array elements, which achieve the super-resolution characteristic with the TR technique, were reported.…”

Section: Introductionmentioning

confidence: 99%

Split-ring-based metamaterial for far-field subwavelength focusing based on time reversal

Huang¹,

Ding²,

Wang³

et al. 2014

Chinese Phys. B

View full text Add to dashboard Cite

In this paper, split-ring-based metamaterial sheets are designed for the purpose of achieving far-field subwavelength focusing, with the aid of a time-reversal technique. The metamaterial sheets are inserted into a subwavelength array consisting of four element antennas, with the element spacing being as small as 1/15 of a wavelength. Experiments are performed to investigate the effect of the metamaterial sheets on the focusing resolution. The results demonstrate that in the presence of the metamaterial sheets, the subwavelength array exhibits the ability to achieve super-resolution focusing, while there is no super-resolution focusing without the metamaterial sheets. Further investigation shows that the metamaterial sheets are contributive to achieving super-resolution by weakening the cross-correlations of the channel impulse responses between the array elements.

show abstract

“…Recent research has shown that micro-defects in solid materials can be detected by combining the techniques of nonlinear elastic wave spectroscopy (NEWS) [1] and time-reversal (TR), [2][3][4] namely NEWS-TR when the NEWS process is the pre-treated one and TR-NEWS when the NEWS process is the post-treated one. [5] Preisach-Mayergoyz (PM) model was first proposed by Preisach [6] and Mayergoyz, [7] then it was introduced into acoustics for the nonlinear wave propagation.…”

Section: Introductionmentioning

confidence: 99%

Multi-crack imaging using nonclassical nonlinear acoustic method

Zhang¹,

Zhang²,

Liu³

et al. 2014

Chinese Phys. B

View full text Add to dashboard Cite

Solid materials with cracks exhibit the nonclassical nonlinear acoustical behavior. The micro-defects in solid materials can be detected by nonlinear elastic wave spectroscopy (NEWS) method with a time-reversal (TR) mirror. While defects lie in viscoelastic solid material with different distances from one another, the nonlinear and hysteretic stress-strain relation is established with Preisach-Mayergoyz (PM) model in crack zone. Pulse inversion (PI) and TR methods are used in numerical simulation and defect locations can be determined from images obtained by the maximum value. Since false-positive defects might appear and degrade the imaging when the defects are located quite closely, the maximum value imaging with a time window is introduced to analyze how defects affect each other and how the fake one occurs. Furthermore, NEWS-TR-NEWS method is put forward to improve NEWS-TR scheme, with another forward propagation (NEWS) added to the existing phases (NEWS and TR). In the added phase, scanner locations are determined by locations of all defects imaged in previous phases, so that whether an imaged defect is real can be deduced. NEWS-TR-NEWS method is proved to be effective to distinguish real defects from the false-positive ones. Moreover, it is also helpful to detect the crack that is weaker than others during imaging procedure.

show abstract

A time reversal damage imaging method for structure health monitoring using Lamb waves

Cited by 8 publications

References 15 publications

Lamb Wave Local Wavenumber Approach for Characterizing Flat Bottom Defects in an Isotropic Thin Plate

Lamb Wave Local Wavenumber Approach for Characterizing Flat Bottom Defects in an Isotropic Thin Plate

Split-ring-based metamaterial for far-field subwavelength focusing based on time reversal

Multi-crack imaging using nonclassical nonlinear acoustic method

Contact Info

Product

Resources

About