The propagation in metal tubing of ultrasonic wave modes equivalent to Lamb waves

Silk, M.G.; Bainton, K.F.

doi:10.1016/0041-624x(79)90006-4

Cited by 262 publications

(115 citation statements)

References 5 publications

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“…For the gouged pipe, peaks which are weaker than the defectfree pipe are selected at 620 and 1220 kHz. The possible propagating modes can be F (1,2) or F (1,3). For the dented pipe, the major peaks occur at 500 and 1180 kHz which corresponds to F(1, 2) and/or F(1, 3) mode.…”

Section: Pipes With Water Flowmentioning

confidence: 99%

“…In summary, it can be stated that when water flows through the pipes strong F(1, 2) and F(1, 3) modes propagate through the wall of the defect-free pipe at slightly higher frequency (>1000 kHz). For the gouged pipe, the possible propagating modes are weak F(1, 2) and F (1,3). For the dented pipe, the possible propagating modes are F(1, 2) and F (1, 3).…”

Section: Pipes With Water Flowmentioning

confidence: 99%

“…In order to identify the propagating guided wave modes through the defective and defect-free pipes, phase velocities are calculated from the peaks in the experimental V ( f ) curves using Snell's law , or all of them together. For the defect-free pipe, the strongest peak occurs at 1140 kHz which means that the strongest propagating modes could be F(1, 2), L(0, 2) or F (1,3). For the gouged pipe, the peaks could be selected at 580, 700, and 1180 kHz (Figure 2(a)), and the corresponding guided wave modes can be identified as F (1,2), L(0, 2), and F(1, 3) (Figure 2(b)).…”

Section: Experimental V ( F ) Curves and Identification Of Propagatinmentioning

confidence: 99%

“…Many investigators [3,4] used guided wave modes for detecting wall thinning defects in cylindrical pipes. Rose and coworkers [5,6] designed a special probe which can be used both as a transmitter and a receiver during the pipe inspection.…”

Section: Introductionmentioning

confidence: 99%

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Structural Health Monitoring of Steel Pipes under Different Boundary Conditions and Choice of Signal Processing Techniques

Ahmad

Kundu

2012

Advances in Civil Engineering

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Guided wave technique is an efficient method for monitoring structural integrity by detecting and forecasting possible damages in distributed pipe networks. Efficient detection depends on appropriate selection of guided wave modes as well as signal processing techniques. Fourier analysis and wavelet analysis are two popular signal processing techniques that provide a flexible set of tools for solving various fundamental problems in science and engineering. In this paper, effective ways of using Fourier and Wavelet analyses on guided wave signals for detecting defects in steel pipes are discussed for different boundary conditions. This research investigates the effectiveness of Fourier transforms and Wavelet analysis in detecting defects in steel pipes. Cylindrical Guided waves are generated by piezo-electric transducers and propagated through the pipe wall boundaries in a pitch-catch system. Fourier transforms of received signals give information regarding the propagating guided wave modes which helps in detecting defects by selecting appropriate modes that are affected by the presence of defects. Continuous wavelet coefficients are found to be sensitive to defects. Several types of mother wavelet functions such as Daubechies, Symlet, and Meyer have been used for the continuous wavelet transform to investigate the most suitable wavelet function for defect detection. This research also investigates the effect of different boundary conditions on wavelet transforms for different mother wavelet functions.

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Section: Pipes With Water Flowmentioning

confidence: 99%

Section: Pipes With Water Flowmentioning

confidence: 99%

Section: Experimental V ( F ) Curves and Identification Of Propagatinmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structural Health Monitoring of Steel Pipes under Different Boundary Conditions and Choice of Signal Processing Techniques

Ahmad

Kundu

2012

Advances in Civil Engineering

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“…The longitudinal and torsional modes in a cylinder are axisymmetric and can be considered as equivalent to Lamb waves and SH waves in plate structures, respectively [31][32][33]. The flexural mode is non-axisymmetric and is considered the true specific mode for cylindrical structures [34].…”

Section: Guided Wave Propagation In Tubular Compositesmentioning

confidence: 99%

Characterisation of Damaged Tubular Composites by Acoustic Emission, Thermal Diffusivity Mapping and TSR-RGB Projection Technique

2016

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An increase in the use of composite materials, owing to improved design and fabrication processes, has led to cost reductions in many industries. Resistance to corrosion, high specific strength, and stiffness are just a few of their many attractive properties. However, damage tolerance remains a major concern in the implementation of composites and uncertainty regarding component lifetimes can lead to over-design and under-use of such materials. A combination of non-destructive evaluation (NDE) and structural health monitoring (SHM) have shown promise in improving confidence by enabling data collection in-situ and in real time. In this work, infrared thermography (IRT) is employed for NDE of tubular composite specimens before and after impact. Four samples are impacted with energies of 5 J, 7.5 J, and 10 J by an un-instrumented falling weight set-up. Acoustic emissions (AE) are monitored using bonded piezoelectric sensors during one of the four impact tests. IRT data is used to generate diffusivity and thermal depth mappings of each sample using the thermographic signal reconstruction (TSR) red green blue (RGB) projection technique. Analysis of AE data alone for a 10 J impact suggest significant damage to the fibres and matrix; this is in good agreement with the generated thermal depth mappings for each sample, which indicate damage through multiple fibre layers. IRT and AE data are correlated and validated by optical micrographs taken along the cross section of damage.

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Guided‐Wave Array Methods

Wilcox¹

2008

Encyclopedia of Structural Health Monitoring

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Guided waves are an attractive mechanism for detecting localized damage in structural health monitoring (SHM) applications because the damage can be remote from sensor locations. There are various techniques for transmitting and detecting guided waves using monolithic devices, but greater flexibility and superior performance can be achieved using arrays of transducer elements in conjunction with digital signal processing. In this article, the requirements for both deployable and permanently attached guided‐wave arrays are described and the differences between arrays used on one‐dimensional and two‐dimensional waveguides are highlighted. A distinction is made between compact arrays where the elements are in close proximity to one another, often in the same package, and sparse distributed arrays. The mathematical principles that are used to achieve mode separation and directionality with compact arrays are summarized and the practical consequences for array design are reviewed with reference to appropriate examples drawn from the literature. The final section of the article examines the somewhat different requirements of a permanently attached sparse array of sensors. Here the suppression of artifacts from structural features is the key challenge to be overcome for a successful SHM system, and it is shown how this dictates the maximum intersensor spacing that can be used.

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The propagation in metal tubing of ultrasonic wave modes equivalent to Lamb waves

Cited by 262 publications

References 5 publications

Structural Health Monitoring of Steel Pipes under Different Boundary Conditions and Choice of Signal Processing Techniques

Structural Health Monitoring of Steel Pipes under Different Boundary Conditions and Choice of Signal Processing Techniques

Characterisation of Damaged Tubular Composites by Acoustic Emission, Thermal Diffusivity Mapping and TSR-RGB Projection Technique

Guided‐Wave Array Methods

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