Mode controlled guided wave tomography using annular array transducers for SHM of water loaded plate like structures

Koduru, Jaya P.; Rose, Joseph L.

doi:10.1088/0964-1726/22/12/125021

Cited by 45 publications

(32 citation statements)

References 33 publications

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“…This approach was originally investigated by Jansen & Hutchins [7]. Other authors [8,9] have also undertaken extensive work to image damage using guided waves, although in the majority of cases the approaches do not quantify a physical parameter such as thickness.…”

Section: Introductionmentioning

confidence: 99%

Improving accuracy through density correction in guided wave tomography

Huthwaite

2016

Proc. R. Soc. A.

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The accurate quantification of wall loss caused by corrosion is critical to the reliable life estimation of pipes and pressure vessels. Traditional thickness gauging by scanning a probe is slow and requires access to all points on the surface; this is impractical in many cases as corrosion often occurs where access is restricted, such as beneath supports where water collects. Guided wave tomography presents a solution to this; by transmitting guided waves through the region of interest and exploiting their dispersive nature, it is possible to build up a map of thickness. While the best results have been seen when using the fundamental modes A0 and S0 at low frequency, the complex scattering of the waves causes errors within the reconstruction. It is demonstrated that these lead to an underestimate in wall loss for A0 but an overestimate for S0. Further analysis showed that this error was related to density variation, which was proportional to thickness. It was demonstrated how this could be corrected for in the reconstructions, in many cases resulting in the near-elimination of the error across a range of defects, and greatly improving the accuracy of life estimates from guided wave tomography.

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Section: Introductionmentioning

confidence: 99%

Improving accuracy through density correction in guided wave tomography

Huthwaite

2016

Proc. R. Soc. A.

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“…Guided waves have been used for inspection in immersed structures, such as ship hulls, submarines and underwater pipes [11][12][13][14][15][16] with focuses on detecting structural discontinuities in such immersed structures. Nonetheless, using guided waves for evaluating plate surface condition change due to the presence of water is much less discussed.…”

Section: Introductionmentioning

confidence: 99%

Case study of guided wave propagation in a one-side water-immersed steel plate

Tian

2015

Case Studies in Nondestructive Testing and Evaluation

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This paper presents a case study of guided waves in a steel plate with one side immersed in water. A hybrid sensing system that uses PZT as the guided wave actuator and a scanning laser vibrometer as the guided wave receiver is employed to acquire the timespace wavefield data. By using the two dimensional Fourier transform, the time-space wavefield is transformed into the frequency-wavenumber domain where the wave modes and the guided wave dispersion can be determined. The study confirms the existence of quasi-Scholte wave in the one-sidedly water-immersed plate in addition to fundamental guided waves. The results also show the quasi-Scholte wave can be directly generated and measured in the immersed plate at low frequencies using the present sensing system. Through pitch-catch sensing tests, the influence of water on guided wave propagation in the one-side water-immersed plate is investigated. It is seen that the water level affects the wave propagation time linearly and can be potentially used for estimation of water level in a container.

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“…The extracted stress components were then applied to the structure to study the selective mode excitation. Higher order modes are sometimes preferred for defects like corrosion [7] and adhesive defect [8,9], but their excitation and tuning characteristics are not well documented in literature. Also, when there are more than two modes existing in the waveguide, e.g.…”

Section: Introductionmentioning

confidence: 99%