Propagation Characteristics and Defect Sensitivity Analysis of Guided Wave From Single Excitation Source in Elbows

Yu, Wenbin; Li, Xueyi

doi:10.1109/access.2019.2920523

Cited by 6 publications

(3 citation statements)

References 27 publications

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“…Ultrasonic guided waves propagating in a solid plate are known as Lamb waves. They are commonly grouped as symmetric and asymmetric modes according to the different vibrations features, governed by the Rayleigh-Lamb frequency equations [41][42][43]. From the Rayleigh-Lamb equations, phase and group velocities dispersion curves can be derived.…”

Section: A Dispersion Curves In a Plate With Bone Materialsmentioning

confidence: 99%

A Preliminary Numerical Study on the Interactions Between Nonlinear Ultrasonic Guided Waves and a Single Crack in Bone Materials With Motivation to the Evaluation of Micro Cracks in Long Bones

et al. 2020

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Fatigue damage in a bone occurs in the form of micro-scale cracks with the lengths as small as to a few microns. The evaluation of cracks in bones has recently been a hot topic. However, the current most frequently used method is based on traditional linear ultrasound, which is just sensitive to gross damages rather than micro cracks. Nonlinear ultrasonic technique, which is capable of detecting microscale damages, has been widely used in metallic structures. However, few study has been directed to employing second harmonic generation of nonlinear ultrasound to evaluate fatigue damages in bones. In this study, a preliminary study is conducted on the interactions between nonlinear guided waves and a single crack in bone materials motivating to the evaluation of micro cracks in long bones. Considering the symmetry, asymmetry, location, orientation, length and width of the crack in bone materials, their influences on second harmonic responses are discussed in detail. Our results are presented as follows. Firstly, not only the primary S0 but also A0 mode Lamb wave generates the second harmonic component of S0 mode after interacting with a symmetric crack. Secondly, along the thickness direction, the primary S0 mode Lamb wave possesses almost the same detection sensitivity, no matter where the crack is located. Thirdly, the amplitudes of S0 mode second harmonic component are increased slightly when the oblique angle of the crack is set from 0º to 45º , while the amplitudes increase dramatically when the oblique angle changes to 67.5º and 90º .Lastly, the second harmonic amplitude and the relative acoustical nonlinear parameter are increased with the length of the crack, while they possess a monotonically decreasing relationship with the width of the crack. Our preliminary studies will provide priori knowledge when using nonlinear ultrasonic guided waves for detecting micro-scale cracks in long bones in future clinical inspections.INDEX TERMS Nonlinear ultrasonic Lamb waves, bone structures, the detection of cracks in bones, second harmonic component, the relative acoustical nonlinear parameter, ultrasonic signal processing

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Section: A Dispersion Curves In a Plate With Bone Materialsmentioning

confidence: 99%

A Preliminary Numerical Study on the Interactions Between Nonlinear Ultrasonic Guided Waves and a Single Crack in Bone Materials With Motivation to the Evaluation of Micro Cracks in Long Bones

et al. 2020

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“…D AMAGE detection based on ultrasonic guided waves techniques has shown great potential for nondestructive testing (NDT) [1]- [9] and structural health monitoring (SHM) [10]- [17] applications. Among the different types of guided waves, shear horizontal (SH) guided waves are used widely, due to their characteristics such as simple dispersion relations and the displacement profiles of the modes.…”

Section: Introductionmentioning

confidence: 99%

Machine Learning-Based Corrosion-Like Defect Estimation With Shear-Horizontal Guided Waves Improved by Mode Separation

et al. 2021

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Shear Horizontal (SH) guided waves have been extensively used to estimate and detect defects in structures like plates and pipes. Depending on the frequency and plate thickness, more than one guided-wave mode propagates, which renders signal interpretation complicated due to mode mixing and complex behavior of each individual mode interacting with defects. This paper investigates the use of machine learning models to analyse the two lowest order SH guided modes, for quantitative size estimation and detection of corrosion-like defects in aluminium plates. The main contribution of the present work is to show that mode separation through machine learning improves the effectiveness of predictive models. Numerical simulations have been performed to generate time series for creating the estimators, while experimental data have been used to validate them. We show that a full mode separation scheme decreased the error rate of the final model by 30% and 67% in defect size estimation and detection respectively.

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“…Ultrasonic guided waves for structural health monitoring has the characteristics of long propagation distance, small attenuation, large detection range and are sensitive to damage such as cracks, debonding, and delamination [1]- [6]. Therefore, guided waves-based structural health monitoring (GWSHM) techniques have broad application prospects in damage monitoring of large-area metal and composite structures such as wings and fuselages [7]- [11].…”

Section: Introductionmentioning

confidence: 99%

An Improved Matching Pursuit-Based Temperature and Load Compensation Method for Ultrasonic Guided Wave Signals

Wang

et al. 2020

IEEE Access

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Temperature and load variations significantly affect ultrasonic guided wave propagation and therefore lead to the increasing of diagnostic uncertainty of the guided wave-based structural health monitoring system, which may cause false reports and false positives and limit the practical application of the method. Most of the existing researches focus on guided wave compensation for a single factor. Therefore it's an important challenge that how to compensate for guided waves under the influence of multiple environmental factors. This study firstly analyzes the coupled effect of temperature and load variations on the propagation characteristics of guided waves. It has been found that the two factors variations cause a highly non-linear effect on the change of guided wave signal characteristics. Based on the previous work of temperature compensation methods based on matching pursuit, this paper develops an improved matching pursuit-based temperature and load compensation method for ultrasonic guided wave signals. The developed method is featured with that the compensation performance can be improved by multiple iteration compensation of the residual signal. By improving the selection of the reference signal set, the developed environmental compensation method based on the reference signal matching is used to realize the compensation under the influence of the temperature-load coupling effect, and the experimental results verify the effectiveness of the proposed compensation method and the proposed compensation method proves to be effective under the influence of temperature and load variations. INDEX TERMS Structural health monitoring, ultrasonic guided wave, environmental compensation, matching pursuit.

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Propagation Characteristics and Defect Sensitivity Analysis of Guided Wave From Single Excitation Source in Elbows

Cited by 6 publications

References 27 publications

A Preliminary Numerical Study on the Interactions Between Nonlinear Ultrasonic Guided Waves and a Single Crack in Bone Materials With Motivation to the Evaluation of Micro Cracks in Long Bones

A Preliminary Numerical Study on the Interactions Between Nonlinear Ultrasonic Guided Waves and a Single Crack in Bone Materials With Motivation to the Evaluation of Micro Cracks in Long Bones

Machine Learning-Based Corrosion-Like Defect Estimation With Shear-Horizontal Guided Waves Improved by Mode Separation

An Improved Matching Pursuit-Based Temperature and Load Compensation Method for Ultrasonic Guided Wave Signals

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