The reflection of the fundamental torsional mode from pit clusters in pipes

Løvstad, Anders; Cawley, P.

doi:10.1016/j.ndteint.2011.11.006

Cited by 34 publications

(14 citation statements)

References 30 publications

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“…Torsional mode T(0, 1) is an alternative mode to L(0, 2) and is widely analysed and applied by many researchers . T(0, 1) has the advantage of being nondispersive over the whole frequency range.…”

Section: Guided Wave Propagation In Pipe Structuresmentioning

confidence: 99%

“…[20] Torsional mode T(0, 1) is an alternative mode to L(0, 2) and is widely analysed and applied by many researchers. [9,[24][25][26][27][28] T(0, 1) has the advantage of being nondispersive over the whole frequency range. No other torsional mode will be excited along the T(0, 1) mode when the frequency of the excitation signal is maintained less than the cutoff frequency of T(0, 2).…”

Section: Multimode and Dispersion Of Guided Waves In Pipesmentioning

confidence: 99%

See 1 more Smart Citation

Guided waves for damage identification in pipeline structures: A review

Guan

Duan

et al. 2017

Struct Control Health Monit

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Summary Guided waves find their niche in cost‐effective damage identification in comparison with conventional nondestructive evaluation. Comprehensive research has been conducted since the 1980s, focusing on the detection of a wide variety of types of damage in metallic and composite structures. The main scope of this paper is to present a review of state‐of‐the‐art guided wave‐based approaches for damage identification in pipeline structures. Theoretical analyses of the interaction between linear and nonlinear guided waves and damage are addressed in detail. Numerical simulations and experimental studies of damage identification in pipeline structures using both linear and nonlinear guided waves are elaborated. Other issues including bends in pipes, effects of environmental and operational conditions on the performance of guided waves are another focus of this review. Future challenge in this field is summarised at the end of this review.

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Section: Guided Wave Propagation In Pipe Structuresmentioning

confidence: 99%

Section: Multimode and Dispersion Of Guided Waves In Pipesmentioning

confidence: 99%

Guided waves for damage identification in pipeline structures: A review

Guan

Duan

et al. 2017

Struct Control Health Monit

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“…At present, UGW technology is used primarily to detect and locate defective areas. A significant number of studies on the interaction of UGW with discontinuities in flat plates [16][17][18][19] and pipes [20][21][22][23][24] have been reported by a number of researchers. One challenge in UGW inspection is that general corrosion occurring over a large surface area may not create reflection sufficient for detections.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Guided Wave Propagation through Welded Lap Joints

Jankauskas

Mažeika

2016

Metals

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Abstract:The objective of the research presented here is the investigation of ultrasonic guided wave (UGW) propagation through the lap joint welded plates used in the construction of a storage tank floors. The investigations have been performed using numerical simulation by finite element method (FEM) and tested by measurement of the transmission losses of the guided waves transmitted through the welded lap joints. Propagation of the symmetric S 0 mode in the welded stainless steel plates in the cases of different lap joint overlap width, operation frequency, and additional plate bonding caused by corrosion were investigated. It was shown that the transmission losses of the S 0 mode can vary in the range of 2 dB to 8 dB depending on the ratio between lap joint width and wavelength. It was also demonstrated that additional bonding in the overlap zone caused by corrosion can essentially reduce transmission losses.

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“…The torsional wave mode was chosen in the study of Kwun et al [9], because it is immune to the presence of liquid product in the pipe. Løvs-tad and Cawley [28] state that the T(0,1) mode is unaffected by liquid present on the inside or outside of the pipe.…”

Section: Introductionmentioning

confidence: 99%

Simplified Ultrasonic Damage Detection in Fluid-Filled Pipes

Vogelaar

Golombok

2017

J Nondestruct Eval

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The location and extent of damage in a pipe can be remotely determined from weld and internal damage reflections using a single acoustic emitter/sensor pair. The use of normalised reflections yields single numbers enabling long distance data collection techniques such as wireless hopping. The attenuation is twice as high for opposite inner and outer fluids (whether air and water, or water and air) as compared to identical inner and outer fluids. The absolute recorded signals in the water-filled pipe are attenuated by a factor two compared to the empty pipe. The axial length of detection is reduced by a half. The reduction of >90% in sensors and the longer axial detection (>10× current state-of-theart-technology) means that permanent fixed sensor pairs for whole pipelines are on the horizon of possibility. The greatest advantage is envisioned in submersed pipelines.

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The reflection of the fundamental torsional mode from pit clusters in pipes

Cited by 34 publications

References 30 publications

Guided waves for damage identification in pipeline structures: A review

Guided waves for damage identification in pipeline structures: A review

Ultrasonic Guided Wave Propagation through Welded Lap Joints

Simplified Ultrasonic Damage Detection in Fluid-Filled Pipes

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