Analytical model and optimal focal position selection for oblique point-focusing shear horizontal guided wave EMAT

Sun, Hongyu; Peng, Lisha; Huang, Songling; Wang, Qing; Wang, Shen; Zhao, Wei

doi:10.1016/j.conbuildmat.2020.120375

Cited by 10 publications

(2 citation statements)

References 25 publications

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“…Since the magnitude, bandwidth, and frequency of the excitation current will affect the mode and amplitude of the SH guided wave, it is also essential to determine the reasonable excitation current properties in the design and optimization of an EMAT. In this work, a burst current is selected as the excitation waveform of the coil, and the expression could be shown as [28] Specifically, in this work, the influence parameters are selected: coil turns n, magnet number m, coil width w, excitation current bandwidth α, and frequency fc. Aperture angle θ and focal length lF are also considered in the study as effective impact factors, which are shown in Fig.…”

Section: Orthogonal Test and Parameter Optimisation A Selection Of Parameters And Resultsmentioning

confidence: 99%

Effective Focal Area Dimension Optimization of Shear Horizontal Point-Focusing EMAT Using Orthogonal Test Method

Sun

Peng

Wang

et al. 2021

IEEE Trans. Instrum. Meas.

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To overcome the shortcomings of low energy conversion efficiency of electromagnetic acoustic transducers (EMATs), point-focusing shear horizontal (PFSH) wave EMAT is used to focus the wave energy into a specific area. Many factors will affect the capability of the focusing transducer, and in addition to considering the signal intensity, the detection accuracy is also required to be investigated. Specifically, to simplify the test process, we use the orthogonal test method to study the effect of different influence parameters on signal intensity and focal area dimensions. Seven factors are selected, and three results are determined in the test. Range analysis shows that for signal amplitude M, the top three impact factors are the coil width w, coil turns n, and focal length lF (equal to bandwidth factor ). Moreover, magnet number m and frequency fc dominate the effective focal length lfd, and aperture angle determines the effective focal width wfd. To enable higher signal intensity and smaller focal area dimensions, it is necessary to consider various factors on the PFSH-EMAT focusing performance. The test's signal intensity with optimized parameters' combination at the focal point is nearly 144.42% higher than the average of all the tests, lfd decreased by 37.84%, and wfd decreased by 50.59%. The experiment also verified that focusing EMAT with optimized parameters has a better focusing performance.

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Section: Orthogonal Test and Parameter Optimisation A Selection Of Parameters And Resultsmentioning

confidence: 99%

Effective Focal Area Dimension Optimization of Shear Horizontal Point-Focusing EMAT Using Orthogonal Test Method

Sun

Peng

Wang

et al. 2021

IEEE Trans. Instrum. Meas.

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“…Ultrasonic guided wave detection technology has the advantages of long propagation distance, low attenuation, and large detection range compared to traditional methods, such as magnetic flux leakage, eddy current, and X-ray [1][2][3]. Therefore, it has been widely used in structural health monitoring (SHM) and non-destructive testing (NDT) of pipeline structures [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Circumferential Damage Monitoring of Steel Pipe Using a Radar Map Based on Torsional Guided Waves

Zheng,

Zhang

2023

Sensors

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Ultrasonic guided wave technology has been successfully applied to detect multiple types of defects in pipes. However, the circumferential location and coverage of a defect are less studied because it is difficult to determine. In this study, the fundamental torsional mode T (0, 1) is selected to conduct monitoring of the circumferential defect in pipelines because of its almost non-dispersive property. A radar map of the peak wave signals at 30 circumferential positions is proposed to detect the damage. The circumferential defect of a steel pipe is thoroughly investigated using numerical simulation. First, the circumferential positioning of defects in various areas of the pipe is studied. Second, the results are compared to those based on longitudinal guide waves. Finally, the circumferential coverage of a defect in the pipeline is determined. The waves are excited and received using the pitch–catch approach, and the collected monitoring signals are processed using the Hilbert transformation. According to the findings, the circumferential defect in the pipe can be effectively identified from a ‘T’ shape in the radar image, and the monitoring method by the torsional guided wave is superior to the longitudinal wave method. The results clearly demonstrate the advantages of torsional guided waves in defect monitoring. The proposed method is expected to provide a promising solution to circumferential damage identification in pipelines.

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Optimal Design of Spiral Coil EMATs for Improving Their Pulse Compression Effect

et al. 2021

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Analytical model and optimal focal position selection for oblique point-focusing shear horizontal guided wave EMAT

Cited by 10 publications

References 25 publications

Effective Focal Area Dimension Optimization of Shear Horizontal Point-Focusing EMAT Using Orthogonal Test Method

Effective Focal Area Dimension Optimization of Shear Horizontal Point-Focusing EMAT Using Orthogonal Test Method

Circumferential Damage Monitoring of Steel Pipe Using a Radar Map Based on Torsional Guided Waves

Optimal Design of Spiral Coil EMATs for Improving Their Pulse Compression Effect

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