Excitation of dominant flexural guided waves in elastic hollow cylinders using time delay circular array transducers

Zhang, Xiaowei; Tang, Zhifeng; Lu, Fengxia; Pan, Xiaohong

doi:10.1016/j.wavemoti.2015.09.010

Cited by 14 publications

(8 citation statements)

References 14 publications

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“…NME 37–42 is an effective method to analyze the propagation of the non-axisymmetric guided wave. The final particle velocity field of the cylinder can be expanded in the form of an infinite series of the normal modes traveling in a waveguide, which are orthogonal to each other.…”

Section: Configuration Of the Sam-mpt Array And The Pipe Health Monitoring Methodsmentioning

confidence: 99%

Demagnetization-based axial magnetized magnetostrictive patch transducers for locating defect in small-diameter pipes using the non-axisymmetric guided wave

Fang

Tse

2019

Structural Health Monitoring

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The propagation of the non-axisymmetric guided wave in the small-diameter pipe is complicated, which makes the circumferential position of the defect difficult to be determined. This article reports on the design of a segmented axially magnetized magnetostrictive patch transducer array for efficient transduction of non-axisymmetric L(M,2) modes to determine defect’s axial and circumferential positions in the small-diameter pipe. First, the background of the magnetostrictive patch transducer and non-axisymmetric guided wave in the pipe was presented. Moreover, the theoretical background to the influence of the length-to-width ratio of the magnetized rectangular patch on the demagnetizing factors was introduced. Second, the method of the pipe health monitoring using the designed segmented axially magnetized magnetostrictive patch transducer array was proposed. Third, the most suitable multi-belts of the flexible printed coils were chosen to provide the dynamic magnetic field by the comparison experiments. Then the signal amplitudes of the segmented axially magnetized magnetostrictive patch transducer array with different length–width ratios of magnetostrictive materials were compared with each other to prove the principle of demagnetization. Another two magnetostrictive patch transducer arrays employing permanent magnets were compared with the proposed segmented axially magnetized magnetostrictive patch transducer array. The experiments of pipe health monitoring were carried out to prove that the proposed method can realize pipe health monitoring over time. Fourth, the defect orientation experiments in a 304 stainless steel pipe with 48 mm inner diameter and 2 mm thickness were performed using the proposed segmented axially magnetized magnetostrictive patch transducer array at 650 kHz. The prediction of the circumferential position of the defects correlated well with the defect’s true location through matching the angular profiles of the experimental results and the modulated numerical analysis for several axial distances. The experimental results for the segmented axially magnetized magnetostrictive patch transducer array demonstrated that the proposed segmented axially magnetized magnetostrictive patch transducer array could potentially be applied to detect the axial and circumferential positions of the defect in a small-diameter pipe.

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Section: Configuration Of the Sam-mpt Array And The Pipe Health Monitoring Methodsmentioning

confidence: 99%

Demagnetization-based axial magnetized magnetostrictive patch transducers for locating defect in small-diameter pipes using the non-axisymmetric guided wave

Fang

Tse

2019

Structural Health Monitoring

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“…Based on reference [18], the guided waves propagating in the axial direction in pipes involve torsional waves T(N,m) and longitudinal waves L(N,m), where the integer N denotes the circumferential order and m represents the group order of a mode. Because the fundamental torsional guided wave mode T(0,1) has the attracting characteristics of no dispersion, low probability of mode conversion, uniform wave-structures in the thickness direction and no response to liquids that may exist at the pipe surface, T(0,1) is most commonly used for pipe inspection [19] and was selected in this work for investigation.…”

Section: Phase Characteristics Of the Guided Wave Reflected From A Rementioning

confidence: 99%

Numerical Investigation of Locating and Identifying Pipeline Reflectors Based on Guided-Wave Circumferential Scanning and Phase Characteristics

Liu

Tang

et al. 2020

Applied Sciences

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The methodology based on reflected guided-wave by a reflector associated with an increase or a decrease in the cross-sectional area has the challenge of determining their location and identity. This paper presents a numerical investigation of a method for locating and identifying the reflector based on guided-wave circumferential scanning and phase characteristics. To determine the axial and circumferential positions of the reflector within the pipeline, the procedures of the guided wave-based circumferential scanning were presented, including data preprocessing, median filter, image smoothing and binary processing. Through theoretical analysis, we obtained the phase relationship between the guided-wave excitation signal and reflection signals generated by a reflector, such as corrosion, crack, weld and support, which caused the change in the cross-sectional area. Consequently, an algorithm based on the phase characteristics was proposed to determine the change and type of reflector. The spatial distances were calculated between the guided wave excitation signals with different phases and the concerned reflection signals, subsequently identifying the change and type of the reflector by comparing the distance values. An identification index named the reliable index for the character of the reflector (RICR) was defined to evaluate the reliability of the predicted results. Numerical and finite element simulation validations of the proposed method were performed. It has been found that if RICR was larger than 1.05, the results predicting the reflector type were reliable. The proposed method was found to be superior relative to the conventional correlation coefficient method according to the numerical results. Finally, the simulation results demonstrated that the proposed method could be potentially applied for locating and identifying reflectors in pipelines.

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“…[29] implemented the obliquely propagating plane waves by using the helical excitation and phased array excitation, respectively, dominant flexural modes are excited in cylinders, which is also validated by numerical simulations and experiments, proving the effectiveness of the ray-plate theory. Similarly, Zhang et al [30,31] also applied a helical comb magnetostrictive patch transducer (HCMPT) [30] and a time delay circular array transducer (TDCAT) [31] to generate flexural cylinder modes. Dominant flexural modes of L(1,1), T (3,1) and L(2,2), respectively, were successfully excited and verified by finite element simulations and experiments.…”

Section: Introductionmentioning

confidence: 99%

Pure Flexural Guided Wave Excitation in Hollow Cylinders by Applying Helical Surface Tractions

Dong

Wentao

2022

SSRN Journal

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Excitation of dominant flexural guided waves in elastic hollow cylinders using time delay circular array transducers

Cited by 14 publications

References 14 publications

Demagnetization-based axial magnetized magnetostrictive patch transducers for locating defect in small-diameter pipes using the non-axisymmetric guided wave

Demagnetization-based axial magnetized magnetostrictive patch transducers for locating defect in small-diameter pipes using the non-axisymmetric guided wave

Numerical Investigation of Locating and Identifying Pipeline Reflectors Based on Guided-Wave Circumferential Scanning and Phase Characteristics

Pure Flexural Guided Wave Excitation in Hollow Cylinders by Applying Helical Surface Tractions

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