Journal ArticleDOI
The excitation of Lamb waves in pipes using dry-coupled piezoelectric transducers
D. N. Alleyne,Peter Cawley +1 more
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TLDR
In this article, the development of a dry-coupled piezoelectric transducer system for the detection of corrosion in chemical plant pipework using cylindrical Lamb waves is described.Abstract:
The development of a dry-coupled piezoelectric transducer system for the detection of corrosion in chemical plant pipework using cylindrical Lamb waves is described. It is shown that the axisymmetricL(0,2) mode at a frequency of about 70 kHz is an attractive mode to use for longdistance propagation. The results show that a ring of piezoelectric length-expander elements can be used to excite theL(0,2) mode and to suppress all the nonaxisymmetric modes. Tests have been carried out both with the piezoelectric elements bonded to the pipe and fabricated into a simple transducer which was clamped against the pipe. The performance of the dry-coupled system was very similar to that of the bonded elements. In pulse echo tests, the noise floor obtained with the dry-coupled system was less than 1% of the amplitude of the propagatingL(0,2) mode. The drycoupled transducers provide a simple, light, readily detachable system for the long-range inspection of pipework.read more
Citations
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Journal ArticleDOI
Brazing Coupling Performance of Piezoelectric Waveguide Transducers for the Monitoring of High Temperature Components.
TL;DR: In this paper, the feasibility of brazing coupling for wave propagation through the junction was investigated through experiments, and the experimental results indicated that the coupling effects of the welding depend on the filler metals.
Book ChapterDOI
Pipeline Health Monitoring to Optimise Plant Efficiency
Anurag Dhutti,Tat-Hean Gan +1 more
TL;DR: In this paper, a comprehensive overview of the state-of-the-art monitoring technologies for steamlines, with a focus on high temperature ultrasonic guided wave techniques, is presented.
Journal ArticleDOI
An On-Line Multiway Approach to In-Situ NDI Looking at the PZL-130TCII
Krzysztof Dragan,Michal Dziendzikowski,Artur Kurnyta,Adam Latoszek,Andrzej Leski,Sylwester Kłysz +5 more
TL;DR: In this paper, the authors presented a holistic approach to the continuous real-time damage growth monitoring and early damage detection in aircraft structure using a piezoelectric transducers (PZT) network.
Proceedings ArticleDOI
Wave focusing in pipe-like structures via gradient-index metamaterial lens toward damage detection and localization
TL;DR: In this article, a gradient-index metamaterial layer is integrated within the pipe design to amplify the signal energy at the positions of the receiving sensors and damage initiation position enabling the transmission of damage information long distances.
Proceedings ArticleDOI
Fault detection in small diameter pipes using ultrasonic guided wave technology
TL;DR: In this paper, the authors used two dry coupled piezoelectric transducers, where one of them transmitted guided waves along the pipe and the other received them, to generate tangential displacement, thereby generating the fundamental torsional mode T(0,1).
References
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Book
Wave Motion in Elastic Solids
TL;DR: In this article, a comprehensive study of elastic wave propagation in solids is presented, ranging from the theory of waves and vibrations in strings to the three-dimensional theory of elastic waves in thick plates.
Journal ArticleDOI
Matrix techniques for modeling ultrasonic waves in multilayered media
TL;DR: This paper presents a review of the main developments of the matrix techniques, and their use in response and modal models, with emphasis on ultrasonics applications.
Journal ArticleDOI
Three‐Dimensional Investigation of the Propagation of Waves in Hollow Circular Cylinders. I. Analytical Foundation
TL;DR: In this paper, the propagation of free harmonic waves along a hollow circular cylinder of infinite extent is discussed within the framework of the linear theory of elasticity, and a characteristic equation appropriate to the circular hollow cylinder is obtained by use of the Helmholtz potentials for arbitrary values of the physical parameters involved.
Journal ArticleDOI
Optimization of Lamb wave inspection techniques
D. N. Alleyne,Peter Cawley +1 more
TL;DR: In this article, the authors discuss the selection of the appropriate mode and frequency range for different inspection requirements and review the possible methods of excitation, response measurement and signal processing, and show that the presence of defects can be detected reliably from changes in the shape of the received waveform.
Journal ArticleDOI
The propagation in metal tubing of ultrasonic wave modes equivalent to Lamb waves
M.G. Silk,K.F. Bainton +1 more
TL;DR: In this article, it is shown that the L(0, 1) mode, which is comparable to the A0 Lamb wave mode in flat plate, can be generated with acceptable efficiency.
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The propagation in metal tubing of ultrasonic wave modes equivalent to Lamb waves
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