Excitation and reception of single torsional wave <i>T</i>(0,1) mode in pipes using face-shear d24 piezoelectric ring array

Miao, Hongchen; Hu, Qiang; Wang, Qiangzhong; Li, Faxin

doi:10.1088/1361-665x/26/2/025021

Cited by 44 publications

(19 citation statements)

References 21 publications

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“…Since many guided wave modes exist in the axial direction at any given frequency and they are in general dispersive, it is often very difficult to extract relevant information on defects from the complex received wave signals. Therefore, much effort has been made to excite pure longitudinal L(0, 2) mode [7][8][9] and the fundamental torsional wave T(0, 1) mode [10,11], since T(0, 1) wave is nondispersive at all frequencies while L(0, 2) wave is virtually non-dispersive in the selected frequency range [12]. However, the L(0, 2) and T(0, 1) modes are axially symmetric, so they have difficulty to locate the defect circumferential position and size the defect.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, a series of face-shear piezoelectric transducers for SHM have been developed to excite single mode SH 0 wave [33][34][35][36]. Since pure SH 0 wave excited by the face-shear transducer is along four main directions (0 • , 90 • , 180 • and 270 • ) [35], it can be inferred that if these face-shear transducers are straightforwardly used to excite CSH 0 wave, flexural waves will be excited simultaneously in the axial direction of the pipe [11,37]. Theoretically, our recently developed bidirectional SH wave piezoelectric transducer (BSH-PT) is capable of exciting pure CSH 0 wave in the pipe [38], but considering that there are many axial guided waves in the pipe, its capability of suppressing axial guided waves needs to be checked.…”

Section: Introductionmentioning

confidence: 99%

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Circumferential SH Wave Piezoelectric Transducer System for Monitoring Corrosion-Like Defect in Large-Diameter Pipes

Zhang

Tang

et al. 2020

Sensors

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The fundamental circumferential shear horizontal (CSH0) wave is of practical importance in monitoring corrosion defects in large-diameter pipes due to its virtually non-dispersive characteristics. However, so far, there have been limited CSH0 wave transducers which can be used to constitute a structural health monitoring (SHM) system for pipes. Moreover, the CSH0 wave’s capability of sizing the corrosion-like defect has not yet been confirmed by experiments. In this work, firstly, the mechanism of exciting CSH waves was analyzed. A method based on our previously developed bidirectional SH wave piezoelectric transducers was then proposed to excite the pure CSH0 mode and first order circumferential shear horizontal (CSH1) mode. Both finite element simulations and experiments show that the bidirectional transducer is capable of exciting pure CSH0 mode traveling in both circumferential directions of a 1-mm thick steel pipe from 100 to 300 kHz. Moreover, this transducer can also serve a sensor to detect CSH0 mode only by filtering circumferential Lamb waves over a wide frequency range from 100 to 450 kHz. After that, a method of sizing a rectangular notch defect by using CSH0 wave was proposed. Experiments on an 11-mm thick steel pipe show that the depth and circumferential extent of a notch can be accurately determined by using the proposed method. Finally, experiments were performed to investigate the reflection and transmission characteristics of CSH0 and CSH1 waves from notches with different depths. It was found that transmission coefficients of CSH0 mode decrease with the increasing of notch depth, which indicates that it is possible to monitor the depth change of corrosion defects by using CSH0 wave.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Circumferential SH Wave Piezoelectric Transducer System for Monitoring Corrosion-Like Defect in Large-Diameter Pipes

Zhang

Tang

et al. 2020

Sensors

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“…The schematic of this setup is illustrated in Figure 6. This type of FEM synthesis of guided wave signals in pipes was developed in previous studies [37,[46][47][48][49][50]. The generated models have also been validated by confirming the accuracy of the received signals from both the device [50], and 3D laser vibrometer [46,47].…”

Section: Finite Element Modelmentioning

confidence: 69%

“…For doing so, the toolset of guided-wave testing devices consists of arrays of linearly placed transducers (rings) across the circumference of the pipe. This leads to excitation of a quasi-axisymmetric wave where, in ideal scenarios, the corresponding flexurals of the excitation wave mode will cancel each other out [1,37,38]. If only one array is used, a bidirectional wave mode is generated since there is no directional control in the normal piezo-electric transducer.…”

Section: Methodsmentioning

confidence: 99%

Improved Defect Detection Using Adaptive Leaky NLMS Filter in Guided-Wave Testing of Pipelines

2019

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Ultrasonic guided wave (UGW) testing of pipelines allows long range assessments of pipe integrity from a single point of inspection. This technology uses a number of arrays of transducers, linearly placed apart from each other to generate a single axisymmetric wave mode. The general propagation routine of the device results in a single time domain signal, which is then used by the inspectors to detect the axisymmetric wave for any defect location. Nonetheless, due to inherited characteristics of the UGW and non-ideal testing conditions, non-axisymmetric (flexural) waves will be transmitted and received in the tests. This adds to the complexity of results' interpretation. In this paper, we implement an adaptive leaky normalized least mean square (NLMS) filter for reducing the effect of non-axisymmetric waves and enhancement of axisymmetric waves. In this approach, no modification in the device hardware is required. This method is validated using the synthesized signal generated by a finite element model (FEM) and real test data gathered from laboratory trials. In laboratory trials, six different sizes of defects with cross-sectional area (CSA) material loss of 8% to 3% (steps of 1%) were tested. To find the optimum frequency, several excitation frequencies in the region of 30-50 kHz (steps of 2 kHz) were used. Furthermore, two sets of parameters were used for the adaptive filter wherein the first set of tests the optimum parameters were set to the FEM test case and, in the second set of tests, the data from the pipe with 4% CSA defect was used. The results demonstrated the capability of this algorithm for enhancing a defect's signal-to-noise ratio (SNR).

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“…Furthermore, the d24 mode PZT wafer can filter Lamb waves and receive SH0 wave only in a wide frequency range. The d24 mode PZT wafers was also assembled into a ring to excite and receive T(0,1) wave in pipes [26].…”

Section: Introductionmentioning

confidence: 99%

A practical omni-directional SH wave transducer for structural health monitoring based on two thickness-poled piezoelectric half-rings

Chen

2019

Ultrasonics

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Structural health monitoring (SHM) has become more and more important in modern industries as it can monitor the safety of structures during the full service life and prevent possible losses of life and economics. Shear horizontal wave in plate-like structures is very useful for long distance inspection since its fundamental mode (SH) is totally non-dispersive. However, all the currently available SH wave transducers are not suitable for practical SHM because of their complicated structures. In this work, we firstly investigated via finite element (FEM) simulations the performances of thickness-poled d PZT ring based omni-directional SH wave piezoelectric transducers (OSH-PT) consisting of different number of elements. Results show that the two-half-ring based OSH-PT can have perfect omni-directivity and acceptable performances in excitation/reception of SH waves. Then, experimental testing on a 21 mm outer-diameter (OD), 9 mm inner-diameter (ID) two-half-ring OSH-PT shows that it exhibits acceptable but not desirable performances in both excitation and reception of SH wave. Finally, size optimization was conducted on the two-half-ring based OSH-PT using FEM simulations and results showed that its performances can be fairly enhanced by reducing the outer diameter of the half-ring. Testing results on a 12 mm-OD, 6 mm-ID OSH-PT show that the SH-to-Lamb waves ratio in the case of self-excitation and self-reception can be over 20 dB from 115 kHz to 250 kHz, which is good enough for practical applications. The proposed two-half-ring OSH-PT is expected to be widely used in SH wave based SHM due to its simple structure, easy fabrication/assembling, low cost and good performances.

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Excitation and reception of single torsional wave T(0,1) mode in pipes using face-shear d24 piezoelectric ring array

Cited by 44 publications

References 21 publications

Circumferential SH Wave Piezoelectric Transducer System for Monitoring Corrosion-Like Defect in Large-Diameter Pipes

Circumferential SH Wave Piezoelectric Transducer System for Monitoring Corrosion-Like Defect in Large-Diameter Pipes

Improved Defect Detection Using Adaptive Leaky NLMS Filter in Guided-Wave Testing of Pipelines

A practical omni-directional SH wave transducer for structural health monitoring based on two thickness-poled piezoelectric half-rings

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