Mode control of guided wave in magnetic hollow cylinder using electromagnetic acoustic transducer array

Furusawa, Akinori; Kojima, Fumio; Morikawa, Atsushi

doi:10.1016/j.net.2014.12.007

Cited by 10 publications

(5 citation statements)

References 9 publications

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“…et al [98] studied the relationship between the orientation of the Lorentz-force-based EMAT array and the triggered guided wave mode. Zhang et al [99] applied this kind of Lorentz-force-based EMAT array in a 114-mm outer diameter, 4.5 mm thickness guardrail post-test.…”

Section: Lorentz-force-based Emat Arraymentioning

confidence: 99%

A review of non-axisymmetric guided waves and their corresponding transducers for defect detection in circular tube structures

Fang

2023

Smart Mater. Struct.

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An axisymmetric guided wave mode is excited independently within a circular tube structure to reduce the complexity of signal interpretation through the prevention of unwanted wave polarisations and reflections. However, it is difficult to use the axisymmetric guided wave to determine the circumferential position and coverage of a defect within the circular tube structure. Non-axisymmetric guided waves can be used to mitigate the limitation of the axisymmetric guided wave through the adoption of a partially covered transducer design and analysis of the propagation characteristics. The partial excitation of non-axisymmetric guided waves can facilitate the arrangement of a transducer during defect detection. This paper reviews state-of-the-art research on non-axisymmetric guided waves for determining the axial positions, circumferential positions, and circumferential lengths of defects. First, the fundamental analysis of a specific non-axisymmetric guided wave mode based on the normal mode expansion method and beam directivity analysis method reveals that the propagation characteristics of the wave mode are closely related to the working principle and configuration of the corresponding transducer. Then, the advantages and disadvantages of the different types of transducers and transducer arrays for the excitation of non-axisymmetric guided waves are introduced and discussed. Finally, the current defect detection methods based on non-axisymmetric guided waves are discussed and summarised. This review can promote the application of non-axisymmetric guided waves in defect detection.

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Section: Lorentz-force-based Emat Arraymentioning

confidence: 99%

A review of non-axisymmetric guided waves and their corresponding transducers for defect detection in circular tube structures

Fang

2023

Smart Mater. Struct.

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“…Furusawa et al [20] designed a circumferentially distributed electromagnetic transducer for longitudinal and torsional waves in cylinders. Kharrat et al [21] presented circumferentially distributed piezoelectric actuators for the first-order torsional wave in cylindrical shells.…”

Section: Introductionmentioning

confidence: 99%

Piezoelectric Transducers for Structural Health Monitoring of Joint Structures in Cylinders: A Wave-Based Design Approach

Wang

Fan

et al. 2020

Sensors

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Joint structures, such as riveting, hinges, and flanges, are widely used in complex mechanical systems. A small unexpected change of a joint can lead to complicated wave-scattering in its connected waveguides. The conversion between wave modes can be used to quantify the variation of the connection status of joints. This gives rise to the challenge of exciting and sensing only one specific wave mode in practice. In this paper, transmitted wave amplitudes of a flange joint are first calculated by the wave finite element method (WFEM) to study the quantitative relationship between the local stiffness changes of the damaged site and the wave-mode conversion. Wave-mode piezoelectric transducers are subsequently designed for torsional, longitudinal, and flexural waves in cylindrical waveguides. The idea is to use the distribution and interconnection of the piezoelectric materials to cancel the charge contributed from the non-targeting waves. We conducted numerical simulations to demonstrate the selective coupling features of the designed wave transducers and found difference of several orders of magnitude in voltages between targeting wave mode and other wave modes. Four selected wave transducers were then extended to monitor the connection status of the flange. The wave-scattering features in the simulation and WFEM were verified to be in good agreement.

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“…Therefore, it is necessary to suppress specific modes when exciting guided waves. In addition to transducers with a single element, transducers with multiple elements have been used to improve the guided wave mode and frequency selection performance [16]. The physics of the generation process whereby the guided wave modes are introduced in the cylindrical structures must be carefully analyzed to determine the design parameters of the transducers influencing the characteristics of the generated field.…”

Section: Introductionmentioning

confidence: 99%

“…The induced voltage signals are amplified and recorded independently for each channel of the receiver. The total received signals from the 16 channels of the receiver form a 2D data matrix.The circumferential and axial amplitude factors are calculated by substituting the parameter settings of the transmitters, shown inFigure 7, into Equations(12) and(16). Four types of angular distribution functions and three types of axial distribution functions are observed.…”

mentioning

confidence: 99%

Analysis of Source Influence on Guided Wave Excitation in Cylindrical Structures Using Spatial Fourier Transform Method

et al. 2020

Journal of Sensors

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Guided wave transducers, such as electromagnetic acoustic transducers and piezoelectric transducers, generate multimode waves at a given excitation frequency in a cylindrical structure, making it difficult to detect flaws in such structures. To accurately identify the flaws, the transducers must be well designed to suppress the nonaxisymmetric modes. Instead of using the normal mode expansion (NME) method, a spatial Fourier transform (SFT) method is proposed to analyze source influence on the guided wave excitation in a cylindrical structure. A two-dimensional SFT is performed on the spatial distribution function of the surface loading applied to the cylindrical structure. The spatial distribution function is represented in a cylindrical coordinate system. The circumferential-direction SFT is carried out from the angular coordinate to the circumferential orders of the guided wave modes. The axial-direction SFT is carried out from the axial coordinate to the wavenumbers of the guided wave modes. The results of the two-dimensional SFT represent guided wave excitation capabilities for different circumferential orders and wavenumbers. The specific surface loading conditions on the outer surface of a pipe are analyzed to predict source influence on the guided wave excitation. The results are consistent with those obtained using the NME method. Experiments corresponding to the specific surface loading conditions are carried out on a stainless steel pipe. The results confirm the effectiveness of the SFT method.

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Mode control of guided wave in magnetic hollow cylinder using electromagnetic acoustic transducer array

Abstract: a b s t r a c tBackground: The aim of this work is to demonstrate a method for exciting and receiving

Cited by 10 publications

References 9 publications

A review of non-axisymmetric guided waves and their corresponding transducers for defect detection in circular tube structures

A review of non-axisymmetric guided waves and their corresponding transducers for defect detection in circular tube structures

Piezoelectric Transducers for Structural Health Monitoring of Joint Structures in Cylinders: A Wave-Based Design Approach

Analysis of Source Influence on Guided Wave Excitation in Cylindrical Structures Using Spatial Fourier Transform Method

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