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  • Analysis of the Wedge Method of Generating Guided

    2020-10-13 · method, a (usually non-viscous) couplant is used to couple ultrasonic energy from the wedge into the layer. In either case, a finite sized transducer emits a beam of ultrasonic waves which subsequently impinges on, and generates waves in, the layer. The pressure profile across the face of the beam is denoted by p( a).

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  • HTML-txt: GUIDED WAVE ANIMATION USING SEMI

    2006-8-15 · GUIDED WAVE ANIMATION USING SEMI-ANALYTICAL FINITE ELEMENT METHOD . T. Hayashi. Nagoya Institute of Technology, Nagoya, Japan Abstract: Many experimental and theoretical studies have shown the great potential of guided waves for rapid, nondestructive evaluation of large pipes and bar-like structures. Inspection using guided wave techniques, however, is still not as common as …

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  • Finite Element Method for Guided Wave Mechanics

    Defect detection in pipes using guided waves, Journal of Ultrasonics 36 (1–5): 147–54. Newmark , N. M. ( 1959 ). A method of computation for structural dynamics , ASCE Journal of the Engineering Mechanics Division 5 (EM3): 67–94.

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  • [PDF] Enhancement of Ultrasonic Guided Wave

    Ultrasonic guided wave (UGW) systems are broadly utilised in several industry sectors where the structural integrity is of concern, in particular, for pipeline inspection. In most cases, the received signal is very noisy due to the presence of unwanted wave modes, which are mainly dispersive. Hence, signal interpretation in this environment is often a challenging task, as it degrades the ...

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  • Defect detection in guided wave signals using

    Defect detection in guided wave signals using nonlinear autoregressive exogenous method. First Published June 2021. Kangwei Wang, Department of Control Science and Engineering, Harbin Institute of Technology, Harbin 150001, P.R. China. Email: [email protected]

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  • Array-Based Guided Wave Source Location Using

    2021-4-19 · In this work, we present a method and experimental data for removing the deleterious effects of multi-mode dispersion allowing for source localization at frequencies comparable to those of bulk waves. Time domain signals are obtained using a novel 64-element phased array and processed to extract wave number and frequency spectra.

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  • Defect detection in guided wave signals using

    2021-6-11 · A separate nonlinear autoregressive exogenous model is trained for each sensor pair in the array using data captured in 2012. The method is first tested using data from a single pair of sensors. Defect signals are synthesized by superposing simulated responses from defects onto later experimental signals obtained from the real structure.

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  • Analysis of Source Influence on Guided Wave

    2021-7-23 · This study proposes a method of constraining compression (P) wave velocity (⁠VP⁠) profiles (up to a depth of 1700 m) using P‐wave seismograms recorded on the ground surface. The relationship between the incidence angle of P waves near the ...

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  • Guided Waves - University of Delaware

    2011-1-3 · P d 2P f D. S. Weile Guided Waves. Perturbation Theory The time average power flow is P f = 1 2 RefVI g= jV 0j 2 2RefZ 0g e 2 z Now, a power dissipated per unit length, P d must be responsible for the decrease: P d = dP f dz = 2 P f Therefore, if we can approximate P …

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  • Finite Element Method for Guided Wave Mechanics

    Defect detection in pipes using guided waves, Journal of Ultrasonics 36 (1–5): 147–54. Newmark , N. M. ( 1959 ). A method of computation for structural dynamics , ASCE Journal of the Engineering Mechanics Division 5 (EM3): 67–94.

    Get Price
  • A Time-Reversal Defect-Identifying Method for

    2008-5-13 · The results demonstrate that the time-reversal method can be used to enhance the inspection energy for the guided wave inspection in pipes and to locate the defects in the circumferential directions. Once the time-reversed signals obtained from the guided wave inspection are applied on a numerical model, the defects can be recognized by the ...

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  • HTML-txt: GUIDED WAVE ANIMATION USING SEMI

    2006-8-15 · GUIDED WAVE ANIMATION USING SEMI-ANALYTICAL FINITE ELEMENT METHOD . T. Hayashi. Nagoya Institute of Technology, Nagoya, Japan Abstract: Many experimental and theoretical studies have shown the great potential of guided waves for rapid, nondestructive evaluation of large pipes and bar-like structures. Inspection using guided wave techniques, however, is still not as common as …

    Get Price
  • Research on Line-scan Inspection Method with Guided

    2008-9-2 · guided waves. In order to solve these problems, X-Y dimension cross product and adding method is promoted in this paper, which can locate the flaw position and visualize the inspection result of guided waves. 1. Line scan of guided waves The inspection methods of guided wave have pulse echo one and through transmission one.

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  • Analysis of guided waves with a nonlinear boundary ...

    We theoretically investigated the cumulative nonlinear guided waves caused by internal resonance, using the method of multiple scales (MMS), which can construct better approximations to the solutions of perturbation problems. In this study, we consider nonlinearity only on the boundary instead of material nonlinearity or geometric nonlinearity.

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  • Defect detection in guided wave signals using

    2021-6-11 · A separate nonlinear autoregressive exogenous model is trained for each sensor pair in the array using data captured in 2012. The method is first tested using data from a single pair of sensors. Defect signals are synthesized by superposing simulated responses from defects onto later experimental signals obtained from the real structure.

    Get Price
  • Analyses of Electromagnetism Guided Waves in Metal

    A short time high power pulse is stimulated by the LC circuit. Through a send winding, the electromagnetic guided wave signals transmit in the metal pipes. A receive winding is mounted around the pipe to collect the receive signals. The receive signals are different if there are several defects in the metal pipe or not. To analyze the instantaneous pulse group, a method of multi-scale entropy ...

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  • Using the Partial Wave Method for Wave Structure ...

    2020-6-1 · Using the Partial Wave Method for Wave Structure Calculation and the Conceptual Interpretation of Elastodynamic Guided Waves Christopher Hakoda and Cliff J. Lissenden * Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, PA 16802, USA; [email protected] * Correspondence: [email protected]

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  • Guided wave propagation in composite laminates using ...

    2013-10-10 · Guided waves open the way for SHM on long distance, with the hope of developing self-sensing structures of large dimensions without necessarily increasing the number of sensors and thus without increasing the complexity of the monitoring system. For guided wave in composite laminate structure, there are advantages in using small piezo-

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  • Modeling of guided wave propagation in a layered

    Propagating guided waves in a layered half-space are modeled with the semi-analytical Distributed Point Source Method (DPSM). For nondestructive evaluation of solid structures using ultrasonic waves it is necessary to have an ultrasonic field model for the damage- free structure. This solution can be used as a baseline or benchmark solution.

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  • Research on Line-scan Inspection Method with Guided

    2008-9-2 · guided waves. In order to solve these problems, X-Y dimension cross product and adding method is promoted in this paper, which can locate the flaw position and visualize the inspection result of guided waves. 1. Line scan of guided waves The inspection methods of guided wave have pulse echo one and through transmission one.

    Get Price
  • A method for the measurement of dispersion curves

    2016-6-8 · Moilanen P, Nicholson P H, Kilappa V, Cheng S and Timonen J 2007 Assessment of the cortical bone thickness using ultrasonic guided waves: modelling and in vitro study Ultrasound Med. Biol. 33 254–62. Crossref

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  • FDTD-Based Tool Simulation Nonlinear Interactions

    2008-12-2 · P (5) where Ex’, Ey’, and Ez’ are the components of electric field on the crystal axes and [T] is the matrix to transform the resulting polarization vector to the coordinate system used in equation 4. The proposed 1D-FDTD procedure for simulation of guided waves with nonlinear interactions is based on two assumptions.

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  • Dispersion Curves Calculation for Guided Waves in

    Dispersion curves present fundamental information on guided waves such as wavelength and dispersivity as well as phase and group velocities at a certain frequency, which is essential for the application of guide wave technology. A numerical method based on modal analysis using ANSYS software was presented to calculate the dispersion curves of guided waves in rod.

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  • [PDF] Ultrasonic Guided Waves in Solid Media |

    Preface Acknowledgments 1. Introduction 2. Dispersion principles 3. Unbounded isotropic and anisotropic media 4. Reflection and refraction 5. Oblique incidence 6. Waves in plates 7. Surface and subsurface waves 8. Finite element method for guided wave mechanics 9. The semi-analytical finite element method (SAFE) 10. Guided waves in hollow cylinders 11.

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  • Wang, K. , Zhang, J., Shen, Y., Karkera, B. M., Croxford ...

    2021-7-23 · This study proposes a method of constraining compression (P) wave velocity (⁠VP⁠) profiles (up to a depth of 1700 m) using P‐wave seismograms recorded on the ground surface. The relationship between the incidence angle of P waves near the ...

    Get Price
  • Using Guided Waves in Thin Rods - MDPI

    2021-1-25 · method was adopted by Sharma and Mukherjee [30,31] to measure guided waves in a rebar, and the signal amplitude was used to correlate with P wave velocity and compressive strength in concrete. Ervin et al. [32] used this method to monitor corrosion of rebar embedded in mortar. However, this method is not applicable when only one side could be ...

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  • Novel Defect Location Method for Pressure Vessel by

    2018-12-14 · Guided wave-based method is a cost-effective means for pressure vessel rapid interrogation. In this paper, the method based on direct-wave and fuzzy C-means clustering algorithm (FCM) is proposed to locate defect for pressure vessel. Finite element (FE) simulation is applied to analyze the propagation characteristics of guided waves.

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  • Guided wave propagation in composite laminates using ...

    2013-10-10 · Guided waves open the way for SHM on long distance, with the hope of developing self-sensing structures of large dimensions without necessarily increasing the number of sensors and thus without increasing the complexity of the monitoring system. For guided wave in composite laminate structure, there are advantages in using small piezo-

    Get Price
  • Pipeline Inspection Using a Torsional Guided-Waves ...

    This paper represents the second part of the work that considers the identification and sizing of machined defects in a pipeline. This study deals with the torsional-mode reflection from defects and structural singularities in an industrial pipeline in order to perform the defect sizing. The wave finite element method (WFEM) is used to construct a numerical database of reflection coefficients ...

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  • Phased Array Beamforming and Imaging in Composite ...

    2020-8-6 · Phased Array Beamforming and Imaging in Composite Laminates Using Guided Waves Zhenhua Tian 1*, Cara A.C. Leckey2, Lingyu Yu 1 1Department of Mechanical Engineering, University of South Carolina, Columbia, SC 2Nondestructive Evaluation Sciences Branch, NASA Langley Research Center, Hampton, VA ABSTRACT This paper presents the phased array beamforming and imaging using guided waves …

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  • Distribution adaptation deep transfer learning

    2021-5-29 · Distribution adaptation deep transfer learning method for cross-structure health monitoring using guided waves Bin Zhang, Xiaobin Hong, and Yuan Liu Structural Health Monitoring 0 10.1177/14759217211010709

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  • Guided Lamb wave-based structural health

    In guided Lamb wave-based structural health monitoring, the interpretation of collected signals is a complex task because of the dispersive and multi-modal characteristics of guided Lamb waves. In this work, a novel wave packet tracing method for damage localization and size quantification is presented.

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  • Inverse Shape Reconstruction of Inner Cavities Using ...

    2021-7-23 · This study proposes a method of constraining compression (P) wave velocity (⁠VP⁠) profiles (up to a depth of 1700 m) using P‐wave seismograms recorded on the ground surface. The relationship between the incidence angle of P waves near the ...

    Get Price