Acoustic Forward Model for Guided Wave Propagation and Scattering in a Pipe Bend

Rasgado-Moreno, Carlos-Omar; Rist, Marek; Land, Raul; Ratassepp, Madis

doi:10.3390/s22020486

Cited by 8 publications

(4 citation statements)

References 47 publications

(50 reference statements)

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“…Numerous techniques have been developed to enhance the accuracy and efficiency of the FX method [ 36 , 37 , 38 , 39 , 40 ]. These methods can be extended for anisotropic media using Thomsen parameters [ 31 , 50 , 51 , 52 ]. We adopt the weighted least-squares method [ 47 , 53 ], which involves determining suitable weighting factors for components both within and outside the propagation region.…”

Section: Extrapolation Operatorsmentioning

confidence: 99%

“…Although the 3D elastodynamic wave equation provides precise descriptions of guided wave interactions with defects, their computational demands often render them impractical for real-world applications. As a solution, many current GWT implementations employ 2D acoustic forward models [ 27 , 28 , 31 , 32 ]. These models simplify complexity by representing the wavefield through a single scalar pressure field.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Efficient Guided Wave Modelling for Tomographic Corrosion Mapping via One-Way Wavefield Extrapolation

Hassefras,

Volker,

Verweij

2024

Sensors

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Mapping corrosion depths along pipeline sections using guided-wave-based tomographic methods is a challenging task. Accurate defect sizing depends heavily on the precision of the forward model in guided wave tomography. This model is fitted to measured data using inversion techniques. This study evaluates the effectiveness of a recursive extrapolation scheme for tomography applications and full waveform inversion. It employs a table-driven approach, with precomputed extrapolation operators stored across a spectrum of wavenumbers. This enables fast modelling for extensive pipe sections, approaching the speed of ray tracing while accurately handling complex velocity models within the full frequency band. This ensures an accurate representation of diffraction phenomena. The study examines the assumptions underlying the extrapolation approach, namely, the negligible reflection and conversion of modes at defects. In our tomography approach, we intend to use multiple wave modes—A0, S0, and SH1—and helical paths. The acoustic extrapolation method is validated through numerical studies for different wave modes, solving the 3D elastodynamic wave equation. Comparison with an experimentally measured single-mode wavefield from an aluminium plate with an artificial defect reveals good agreement.

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Section: Extrapolation Operatorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Efficient Guided Wave Modelling for Tomographic Corrosion Mapping via One-Way Wavefield Extrapolation

Hassefras,

Volker,

Verweij

2024

Sensors

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“…The challenges associated with bent configurations, such as mode conversion and dispersion, necessitate a nuanced approach for effective damage detection and localization [8][9][10][11]. Many researches have investigated the impact of curvature on guided wave propagation and have developed methods to adapt sensor configurations, considering the complexities introduced by bending [12][13][14]. The selection of appropriate wave modes and the integration of advanced signal processing techniques, including time-frequency analysis and machine learning,…”

Section: Introductionmentioning

confidence: 99%

Effect of bending modes on failure analysis of adhesively bonded composite structures

Zhang,

Radzienski,

Ostachowicz

2024

Health Monitoring of Structural and Biological Systems XVIII

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This research paper addresses the critical issue of identifying structural health conditions of bonded composites when subjected to varying bending modes. In response to heightened demands for eco-efficiency, the aviation sector has embraced lightweight designs, with composite materials supplanting traditional aluminum due to their remarkable tensile stiffness and reduced weight. However, the practical utilization of bonded composites introduces challenges, as nonuniform loads can lead to bending and deformation, potentially hindering failures detection capabilities within the bonded structures. This study explores the technology details for employing guided waves to assess health conditions. The damage extent is analysed by capturing the reflected guided waves that propagate in the bending deflection of the bonded composite strip. The analytical results are also resolved aiming to compare with experiment and simulation results, which explains in more detail the propagation process of guided waves in bent materials. The Scanning Laser Doppler Vibrometry (SLDV) techniques are used to visualise the full wave fields. The research results show that the bending of the composite structure exerts a discernible impact on the guided wave's ability to accurately quantify cracks. Consequently, the indicators used to gauge faults undergo notable shifts in correspondence with these variations. Notably, employing a prognosis model trained via a sample with zero deflection, to predict the remaining useful life (RUL) of a deflected sample introduces uncertainty error. This underscores the intricate relationship between deflectioninduced changes and damage prediction using guided wave analysis. The deviations that occur in the process of predicting RUL serve as a pivotal reminder of the intricate nature of damage assessment in the presence of deflection, warranting comprehensive consideration in the development of predictive models based on bent specimens.

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“…The T (0,1) mode reflection from the axial defect on the pipe was discovered to be a series of wave pulses with progressively decreasing amplitudes based on computational analysis and experimental validation [17]. The phenomenon was caused by the distinct echoes resulting from the shear wave diffraction and repeated circumferential propagation.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic guided wave testing on pipeline corrosion detection using torsional T(0,1) guided waves

Yung

Pang

Hamid

et al. 2022

JMES

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Ultrasonic guided wave testing (UGWT) is used in rapid screening to detect, locate and classify corrosion defects. This non-destructive testing technique can perform wide-range inspection from a single point, thus reducing the time and effort required for NDT. However, the mode conversion phenomena and the dispersive nature of the guided waves make corrosion detection difficult. Hence, the parametric studies on the response signals of a T (0, 1) wave from pipe defects were presented in this paper. Firstly, a mathematical model of 6-inch schedule 40 pipes was developed. The corrosion profile of various geometries was then constructed on the outer surface of the pipeline by varying the circumferential length and depth. The numerical study was performed to analyse the characteristics of the response signals when a torsional guided wave impinges on the corroded pipelines. A five-cycle Hanning tone-burst signal with a central frequency of 30k Hz was used throughout the study. The results demonstrated that mode conversion to a flexural mode F (1, m) occurs when the stimulated T (0, 1) strikes non-symmetric defects. Nonetheless, as the circumferential extent of the corrosion increased, the response signals tended to behave symmetrically, and there was less mode conversion detected. Thus, the presence of flexural mode F (1, m) can be used as the criteria to distinguish symmetric and asymmetric faults. In addition, the results demonstrated that the reflection coefficients increase monotonically with the defect's depth due to the increases in the estimated cross-sectional area loss (ECL). As a result, a more significant proportion of the transmission wave was reflected. These findings serve as guidelines for on-site inspections. With the known speed of guided wave propagation, it is possible to precisely forecast the position of faults.

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Acoustic Forward Model for Guided Wave Propagation and Scattering in a Pipe Bend

Cited by 8 publications

References 47 publications

Efficient Guided Wave Modelling for Tomographic Corrosion Mapping via One-Way Wavefield Extrapolation

Efficient Guided Wave Modelling for Tomographic Corrosion Mapping via One-Way Wavefield Extrapolation

Effect of bending modes on failure analysis of adhesively bonded composite structures

Ultrasonic guided wave testing on pipeline corrosion detection using torsional T(0,1) guided waves

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