The reflection of the fundamental torsional guided wave from multiple circular holes in pipes

Løvstad, Anders; Cawley, P.

doi:10.1016/j.ndteint.2011.05.010

Cited by 70 publications

(32 citation statements)

References 36 publications

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“…A trained operator can then assess the shape, amplitude and mode of these reflections to infer the nature of the feature which caused the reflection. Damage such as corrosion will produce a reflection, 51,52 as will benign pipe features such as welds and supports. 53 There can also be signal components due to the excitation and reception of unwanted modes and imperfect direction control.…”

Section: Large Area Monitoringmentioning

confidence: 99%

Structural health monitoring: Closing the gap between research and industrial deployment

Cawley

2018

Structural Health Monitoring

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There has been a large volume of research on structural health monitoring since the 1970s but this research effort has yielded relatively few routine industrial applications. Structural health monitoring can include applications on very different structures with very different requirements; this article splits the subject into four broad categories: rotating machine condition monitoring, global monitoring of large structures (structural identification), large area monitoring where the area covered is part of a larger structure, and local monitoring. The capabilities and potential applications of techniques in each category are discussed. Condition monitoring of rotating machine components is very different to the other categories since it is not strictly concerned with structural health. However, it is often linked with structural health monitoring and is a relatively mature field with many routine applications, so useful lessons can be read across to mainstream structural health monitoring where there are many fewer industrial applications. Reasons for the slow transfer from research to practical application of structural health monitoring include lack of attention to the business case for monitoring, insufficient attention to how the large data flows will be handled and the lack of performance validation on real structures in industrial environments. These issues are discussed and ways forward proposed; it is concluded that given better focused research and development considering the key factors identified here, structural health monitoring has the potential to follow the path of rotating machine condition monitoring and become a widely deployed technology.

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Section: Large Area Monitoringmentioning

confidence: 99%

Structural health monitoring: Closing the gap between research and industrial deployment

Cawley

2018

Structural Health Monitoring

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306

203

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“…These are often confirmed with subsequent ultrasonic thickness gauging of corroded areas [5]. However, these techniques have limitations, in that the long range guided waves are generated via a collar of piezoelectric transducers in pulse echo operation [3,6], which requires full 3 circumferential access. Smart inspection pigs may require processing shut down [7] and that the pipe is capable of having a pig installed, which is not possible in all cases.…”

Section: Introductionmentioning

confidence: 99%

Circumferential guided wave EMAT system for pipeline screening using shear horizontal ultrasound

Clough

Fleming²,

Dixon

2017

NDT & E International

113

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The use of guided waves is now widespread in industrial NDT for locating metal loss in pipelines, that manifests as pitting, corrosion and general wall thinning. In this paper, a screening technique is assessed in terms of defect detection and defect sizing capability.Shear Horizontal (SH) guided waves propagate circumferentially around the pipe whilst the scanner is moved axially along the length. This type of tool is preferable to other methods, being applied to the exterior of the pipe, without requiring full circumferential access, and is able to operate through thin coatings (up to 1 mm thick). It is designed to provide a pipe screening tool for petrochemical pipelines both topside and subsea, particularly for detecting defects at pipe support areas. The system's efficacy in terms of detection and sizing of defects is considered via experimental measurements on artificially induced defects and in service corrosion patches, with results compared to finite element modelling of the interaction of the guided waves with artificial defects. Finite element modelling has 2 been used to better understand the behaviour of different wave modes when they interact with defects, focusing on the mode conversions and reflections that occur.

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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 reflection of the fundamental torsional guided wave from multiple circular holes in pipes

Cited by 70 publications

References 36 publications

Structural health monitoring: Closing the gap between research and industrial deployment

Structural health monitoring: Closing the gap between research and industrial deployment

Circumferential guided wave EMAT system for pipeline screening using shear horizontal ultrasound

Ultrasonic Guided Wave Propagation through Welded Lap Joints

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